(function (root, factory) {
    if (typeof define === 'function' && define.amd) {
        // AMD. Register as an anonymous module.
        define(['leaflet'], factory);
    } else if (typeof modules === 'object' && module.exports) {
        // define a Common JS module that relies on 'leaflet'
        module.exports = factory(require('leaflet'));
    } else {
        // Assume Leaflet is loaded into global object L already
        factory(L);
    }
}(this, function (L) {
    'use strict';

    L.TileLayer.Provider = L.TileLayer.extend({
        initialize: function (arg, options) {
            var providers = L.TileLayer.Provider.providers;

            var parts = arg.split('.');

            var providerName = parts[0];
            var variantName = parts[1];

            if (!providers[providerName]) {
                throw 'No such provider (' + providerName + ')';
            }

            var provider = {
                url: providers[providerName].url,
                options: providers[providerName].options
            };

            // overwrite values in provider from variant.
            if (variantName && 'variants' in providers[providerName]) {
                if (!(variantName in providers[providerName].variants)) {
                    throw 'No such variant of ' + providerName + ' (' + variantName + ')';
                }
                var variant = providers[providerName].variants[variantName];
                var variantOptions;
                if (typeof variant === 'string') {
                    variantOptions = {
                        variant: variant
                    };
                } else {
                    variantOptions = variant.options;
                }
                provider = {
                    url: variant.url || provider.url,
                    options: L.Util.extend({}, provider.options, variantOptions)
                };
            }

            // replace attribution placeholders with their values from toplevel provider attribution,
            // recursively
            var attributionReplacer = function (attr) {
                if (attr.indexOf('{attribution.') === -1) {
                    return attr;
                }
                return attr.replace(/\{attribution.(\w*)\}/g,
                    function (match, attributionName) {
                        return attributionReplacer(providers[attributionName].options.attribution);
                    }
                );
            };
            provider.options.attribution = attributionReplacer(provider.options.attribution);

            // Compute final options combining provider options with any user overrides
            var layerOpts = L.Util.extend({}, provider.options, options);
            L.TileLayer.prototype.initialize.call(this, provider.url, layerOpts);
        }
    });

    /**
     * Definition of providers.
     * see http://leafletjs.com/reference.html#tilelayer for options in the options map.
     */

    L.TileLayer.Provider.providers = {
        OpenStreetMap: {
            url: 'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
            options: {
                maxZoom: 19,
                attribution:
                    '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
            },
            variants: {
                Mapnik: {},
                DE: {
                    url: 'https://{s}.tile.openstreetmap.de/{z}/{x}/{y}.png',
                    options: {
                        maxZoom: 18
                    }
                },
                CH: {
                    url: 'https://tile.osm.ch/switzerland/{z}/{x}/{y}.png',
                    options: {
                        maxZoom: 18,
                        bounds: [[45, 5], [48, 11]]
                    }
                },
                France: {
                    url: 'https://{s}.tile.openstreetmap.fr/osmfr/{z}/{x}/{y}.png',
                    options: {
                        maxZoom: 20,
                        attribution: '&copy; OpenStreetMap France | {attribution.OpenStreetMap}'
                    }
                },
                HOT: {
                    url: 'https://{s}.tile.openstreetmap.fr/hot/{z}/{x}/{y}.png',
                    options: {
                        attribution:
                            '{attribution.OpenStreetMap}, ' +
                            'Tiles style by <a href="https://www.hotosm.org/" target="_blank">Humanitarian OpenStreetMap Team</a> ' +
                            'hosted by <a href="https://openstreetmap.fr/" target="_blank">OpenStreetMap France</a>'
                    }
                },
                BZH: {
                    url: 'https://tile.openstreetmap.bzh/br/{z}/{x}/{y}.png',
                    options: {
                        attribution: '{attribution.OpenStreetMap}, Tiles courtesy of <a href="http://www.openstreetmap.bzh/" target="_blank">Breton OpenStreetMap Team</a>',
                        bounds: [[46.2, -5.5], [50, 0.7]]
                    }
                }
            }
        },
        MapTilesAPI: {
            url: 'https://maptiles.p.rapidapi.com/{variant}/{z}/{x}/{y}.png?rapidapi-key={apikey}',
            options: {
                attribution:
                    '&copy; <a href="http://www.maptilesapi.com/">MapTiles API</a>, {attribution.OpenStreetMap}',
                variant: 'en/map/v1',
                // Get your own MapTiles API access token here : https://www.maptilesapi.com/
                // NB : this is a demonstration key that comes with no guarantee and not to be used in production
                apikey: '<insert your api key here>',
                maxZoom: 19
            },
            variants: {
                OSMEnglish: {
                    options: {
                        variant: 'en/map/v1'
                    }
                },
                OSMFrancais: {
                    options: {
                        variant: 'fr/map/v1'
                    }
                },
                OSMEspagnol: {
                    options: {
                        variant: 'es/map/v1'
                    }
                }
            }
        },
        OpenSeaMap: {
            url: 'https://tiles.openseamap.org/seamark/{z}/{x}/{y}.png',
            options: {
                attribution: 'Map data: &copy; <a href="http://www.openseamap.org">OpenSeaMap</a> contributors'
            }
        },
        OPNVKarte: {
            url: 'https://tileserver.memomaps.de/tilegen/{z}/{x}/{y}.png',
            options: {
                maxZoom: 18,
                attribution: 'Map <a href="https://memomaps.de/">memomaps.de</a> <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, map data {attribution.OpenStreetMap}'
            }
        },
        OpenTopoMap: {
            url: 'https://{s}.tile.opentopomap.org/{z}/{x}/{y}.png',
            options: {
                maxZoom: 17,
                attribution: 'Map data: {attribution.OpenStreetMap}, <a href="http://viewfinderpanoramas.org">SRTM</a> | Map style: &copy; <a href="https://opentopomap.org">OpenTopoMap</a> (<a href="https://creativecommons.org/licenses/by-sa/3.0/">CC-BY-SA</a>)'
            }
        },
        OpenRailwayMap: {
            url: 'https://{s}.tiles.openrailwaymap.org/standard/{z}/{x}/{y}.png',
            options: {
                maxZoom: 19,
                attribution: 'Map data: {attribution.OpenStreetMap} | Map style: &copy; <a href="https://www.OpenRailwayMap.org">OpenRailwayMap</a> (<a href="https://creativecommons.org/licenses/by-sa/3.0/">CC-BY-SA</a>)'
            }
        },
        OpenFireMap: {
            url: 'http://openfiremap.org/hytiles/{z}/{x}/{y}.png',
            options: {
                maxZoom: 19,
                attribution: 'Map data: {attribution.OpenStreetMap} | Map style: &copy; <a href="http://www.openfiremap.org">OpenFireMap</a> (<a href="https://creativecommons.org/licenses/by-sa/3.0/">CC-BY-SA</a>)'
            }
        },
        SafeCast: {
            url: 'https://s3.amazonaws.com/te512.safecast.org/{z}/{x}/{y}.png',
            options: {
                maxZoom: 16,
                attribution: 'Map data: {attribution.OpenStreetMap} | Map style: &copy; <a href="https://blog.safecast.org/about/">SafeCast</a> (<a href="https://creativecommons.org/licenses/by-sa/3.0/">CC-BY-SA</a>)'
            }
        },
        Stadia: {
            url: 'https://tiles.stadiamaps.com/tiles/alidade_smooth/{z}/{x}/{y}{r}.png',
            options: {
                maxZoom: 20,
                attribution: '&copy; <a href="https://stadiamaps.com/">Stadia Maps</a>, &copy; <a href="https://openmaptiles.org/">OpenMapTiles</a> &copy; <a href="http://openstreetmap.org">OpenStreetMap</a> contributors'
            },
            variants: {
                AlidadeSmooth: {
                    url: 'https://tiles.stadiamaps.com/tiles/alidade_smooth/{z}/{x}/{y}{r}.png'
                },
                AlidadeSmoothDark: {
                    url: 'https://tiles.stadiamaps.com/tiles/alidade_smooth_dark/{z}/{x}/{y}{r}.png'
                },
                OSMBright: {
                    url: 'https://tiles.stadiamaps.com/tiles/osm_bright/{z}/{x}/{y}{r}.png'
                },
                Outdoors: {
                    url: 'https://tiles.stadiamaps.com/tiles/outdoors/{z}/{x}/{y}{r}.png'
                }
            }
        },
        Thunderforest: {
            url: 'https://{s}.tile.thunderforest.com/{variant}/{z}/{x}/{y}.png?apikey={apikey}',
            options: {
                attribution:
                    '&copy; <a href="http://www.thunderforest.com/">Thunderforest</a>, {attribution.OpenStreetMap}',
                variant: 'cycle',
                apikey: '<insert your api key here>',
                maxZoom: 22
            },
            variants: {
                OpenCycleMap: 'cycle',
                Transport: {
                    options: {
                        variant: 'transport'
                    }
                },
                TransportDark: {
                    options: {
                        variant: 'transport-dark'
                    }
                },
                SpinalMap: {
                    options: {
                        variant: 'spinal-map'
                    }
                },
                Landscape: 'landscape',
                Outdoors: 'outdoors',
                Pioneer: 'pioneer',
                MobileAtlas: 'mobile-atlas',
                Neighbourhood: 'neighbourhood'
            }
        },
        CyclOSM: {
            url: 'https://{s}.tile-cyclosm.openstreetmap.fr/cyclosm/{z}/{x}/{y}.png',
            options: {
                maxZoom: 20,
                attribution: '<a href="https://github.com/cyclosm/cyclosm-cartocss-style/releases" title="CyclOSM - Open Bicycle render">CyclOSM</a> | Map data: {attribution.OpenStreetMap}'
            }
        },
        Jawg: {
            url: 'https://{s}.tile.jawg.io/{variant}/{z}/{x}/{y}{r}.png?access-token={accessToken}',
            options: {
                attribution:
                    '<a href="http://jawg.io" title="Tiles Courtesy of Jawg Maps" target="_blank">&copy; <b>Jawg</b>Maps</a> ' +
                    '{attribution.OpenStreetMap}',
                minZoom: 0,
                maxZoom: 22,
                subdomains: 'abcd',
                variant: 'jawg-terrain',
                // Get your own Jawg access token here : https://www.jawg.io/lab/
                // NB : this is a demonstration key that comes with no guarantee
                accessToken: '<insert your access token here>',
            },
            variants: {
                Streets: 'jawg-streets',
                Terrain: 'jawg-terrain',
                Sunny: 'jawg-sunny',
                Dark: 'jawg-dark',
                Light: 'jawg-light',
                Matrix: 'jawg-matrix'
            }
        },
        MapBox: {
            url: 'https://api.mapbox.com/styles/v1/{id}/tiles/{z}/{x}/{y}{r}?access_token={accessToken}',
            options: {
                attribution:
                    '&copy; <a href="https://www.mapbox.com/about/maps/" target="_blank">Mapbox</a> ' +
                    '{attribution.OpenStreetMap} ' +
                    '<a href="https://www.mapbox.com/map-feedback/" target="_blank">Improve this map</a>',
                tileSize: 512,
                maxZoom: 18,
                zoomOffset: -1,
                id: 'mapbox/streets-v11',
                accessToken: '<insert your access token here>',
            }
        },
        MapTiler: {
            url: 'https://api.maptiler.com/maps/{variant}/{z}/{x}/{y}{r}.{ext}?key={key}',
            options: {
                attribution:
                    '<a href="https://www.maptiler.com/copyright/" target="_blank">&copy; MapTiler</a> <a href="https://www.openstreetmap.org/copyright" target="_blank">&copy; OpenStreetMap contributors</a>',
                variant: 'streets',
                ext: 'png',
                key: '<insert your MapTiler Cloud API key here>',
                tileSize: 512,
                zoomOffset: -1,
                minZoom: 0,
                maxZoom: 21
            },
            variants: {
                Streets: 'streets',
                Basic: 'basic',
                Bright: 'bright',
                Pastel: 'pastel',
                Positron: 'positron',
                Hybrid: {
                    options: {
                        variant: 'hybrid',
                        ext: 'jpg'
                    }
                },
                Toner: 'toner',
                Topo: 'topo',
                Voyager: 'voyager'
            }
        },
        Stamen: {
            url: 'https://stamen-tiles-{s}.a.ssl.fastly.net/{variant}/{z}/{x}/{y}{r}.{ext}',
            options: {
                attribution:
                    'Map tiles by <a href="http://stamen.com">Stamen Design</a>, ' +
                    '<a href="http://creativecommons.org/licenses/by/3.0">CC BY 3.0</a> &mdash; ' +
                    'Map data {attribution.OpenStreetMap}',
                subdomains: 'abcd',
                minZoom: 0,
                maxZoom: 20,
                variant: 'toner',
                ext: 'png'
            },
            variants: {
                Toner: 'toner',
                TonerBackground: 'toner-background',
                TonerHybrid: 'toner-hybrid',
                TonerLines: 'toner-lines',
                TonerLabels: 'toner-labels',
                TonerLite: 'toner-lite',
                Watercolor: {
                    url: 'https://stamen-tiles-{s}.a.ssl.fastly.net/{variant}/{z}/{x}/{y}.{ext}',
                    options: {
                        variant: 'watercolor',
                        ext: 'jpg',
                        minZoom: 1,
                        maxZoom: 16
                    }
                },
                Terrain: {
                    options: {
                        variant: 'terrain',
                        minZoom: 0,
                        maxZoom: 18
                    }
                },
                TerrainBackground: {
                    options: {
                        variant: 'terrain-background',
                        minZoom: 0,
                        maxZoom: 18
                    }
                },
                TerrainLabels: {
                    options: {
                        variant: 'terrain-labels',
                        minZoom: 0,
                        maxZoom: 18
                    }
                },
                TopOSMRelief: {
                    url: 'https://stamen-tiles-{s}.a.ssl.fastly.net/{variant}/{z}/{x}/{y}.{ext}',
                    options: {
                        variant: 'toposm-color-relief',
                        ext: 'jpg',
                        bounds: [[22, -132], [51, -56]]
                    }
                },
                TopOSMFeatures: {
                    options: {
                        variant: 'toposm-features',
                        bounds: [[22, -132], [51, -56]],
                        opacity: 0.9
                    }
                }
            }
        },
        TomTom: {
            url: 'https://{s}.api.tomtom.com/map/1/tile/{variant}/{style}/{z}/{x}/{y}.{ext}?key={apikey}',
            options: {
                variant: 'basic',
                maxZoom: 22,
                attribution:
                    '<a href="https://tomtom.com" target="_blank">&copy;  1992 - ' + new Date().getFullYear() + ' TomTom.</a> ',
                subdomains: 'abcd',
                style: 'main',
                ext: 'png',
                apikey: '<insert your API key here>',
            },
            variants: {
                Basic: 'basic',
                Hybrid: 'hybrid',
                Labels: 'labels'
            }
        },
        Esri: {
            url: 'https://server.arcgisonline.com/ArcGIS/rest/services/{variant}/MapServer/tile/{z}/{y}/{x}',
            options: {
                variant: 'World_Street_Map',
                attribution: 'Tiles &copy; Esri'
            },
            variants: {
                WorldStreetMap: {
                    options: {
                        attribution:
                            '{attribution.Esri} &mdash; ' +
                            'Source: Esri, DeLorme, NAVTEQ, USGS, Intermap, iPC, NRCAN, Esri Japan, METI, Esri China (Hong Kong), Esri (Thailand), TomTom, 2012'
                    }
                },
                DeLorme: {
                    options: {
                        variant: 'Specialty/DeLorme_World_Base_Map',
                        minZoom: 1,
                        maxZoom: 11,
                        attribution: '{attribution.Esri} &mdash; Copyright: &copy;2012 DeLorme'
                    }
                },
                WorldTopoMap: {
                    options: {
                        variant: 'World_Topo_Map',
                        attribution:
                            '{attribution.Esri} &mdash; ' +
                            'Esri, DeLorme, NAVTEQ, TomTom, Intermap, iPC, USGS, FAO, NPS, NRCAN, GeoBase, Kadaster NL, Ordnance Survey, Esri Japan, METI, Esri China (Hong Kong), and the GIS User Community'
                    }
                },
                WorldImagery: {
                    options: {
                        variant: 'World_Imagery',
                        attribution:
                            '{attribution.Esri} &mdash; ' +
                            'Source: Esri, i-cubed, USDA, USGS, AEX, GeoEye, Getmapping, Aerogrid, IGN, IGP, UPR-EGP, and the GIS User Community'
                    }
                },
                WorldTerrain: {
                    options: {
                        variant: 'World_Terrain_Base',
                        maxZoom: 13,
                        attribution:
                            '{attribution.Esri} &mdash; ' +
                            'Source: USGS, Esri, TANA, DeLorme, and NPS'
                    }
                },
                WorldShadedRelief: {
                    options: {
                        variant: 'World_Shaded_Relief',
                        maxZoom: 13,
                        attribution: '{attribution.Esri} &mdash; Source: Esri'
                    }
                },
                WorldPhysical: {
                    options: {
                        variant: 'World_Physical_Map',
                        maxZoom: 8,
                        attribution: '{attribution.Esri} &mdash; Source: US National Park Service'
                    }
                },
                OceanBasemap: {
                    options: {
                        variant: 'Ocean_Basemap',
                        maxZoom: 13,
                        attribution: '{attribution.Esri} &mdash; Sources: GEBCO, NOAA, CHS, OSU, UNH, CSUMB, National Geographic, DeLorme, NAVTEQ, and Esri'
                    }
                },
                NatGeoWorldMap: {
                    options: {
                        variant: 'NatGeo_World_Map',
                        maxZoom: 16,
                        attribution: '{attribution.Esri} &mdash; National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, iPC'
                    }
                },
                WorldGrayCanvas: {
                    options: {
                        variant: 'Canvas/World_Light_Gray_Base',
                        maxZoom: 16,
                        attribution: '{attribution.Esri} &mdash; Esri, DeLorme, NAVTEQ'
                    }
                }
            }
        },
        OpenWeatherMap: {
            url: 'http://{s}.tile.openweathermap.org/map/{variant}/{z}/{x}/{y}.png?appid={apiKey}',
            options: {
                maxZoom: 19,
                attribution: 'Map data &copy; <a href="http://openweathermap.org">OpenWeatherMap</a>',
                apiKey: '<insert your api key here>',
                opacity: 0.5
            },
            variants: {
                Clouds: 'clouds',
                CloudsClassic: 'clouds_cls',
                Precipitation: 'precipitation',
                PrecipitationClassic: 'precipitation_cls',
                Rain: 'rain',
                RainClassic: 'rain_cls',
                Pressure: 'pressure',
                PressureContour: 'pressure_cntr',
                Wind: 'wind',
                Temperature: 'temp',
                Snow: 'snow'
            }
        },
        HERE: {
            /*
             * HERE maps, formerly Nokia maps.
             * These basemaps are free, but you need an api id and app key. Please sign up at
             * https://developer.here.com/plans
             */
            url:
                'https://{s}.{base}.maps.api.here.com/maptile/2.1/' +
                '{type}/{mapID}/{variant}/{z}/{x}/{y}/{size}/{format}?' +
                'app_id={app_id}&app_code={app_code}&lg={language}',
            options: {
                attribution:
                    'Map &copy; 1987-' + new Date().getFullYear() + ' <a href="http://developer.here.com">HERE</a>',
                subdomains: '1234',
                mapID: 'newest',
                'app_id': '<insert your app_id here>',
                'app_code': '<insert your app_code here>',
                base: 'base',
                variant: 'normal.day',
                maxZoom: 20,
                type: 'maptile',
                language: 'eng',
                format: 'png8',
                size: '256'
            },
            variants: {
                normalDay: 'normal.day',
                normalDayCustom: 'normal.day.custom',
                normalDayGrey: 'normal.day.grey',
                normalDayMobile: 'normal.day.mobile',
                normalDayGreyMobile: 'normal.day.grey.mobile',
                normalDayTransit: 'normal.day.transit',
                normalDayTransitMobile: 'normal.day.transit.mobile',
                normalDayTraffic: {
                    options: {
                        variant: 'normal.traffic.day',
                        base: 'traffic',
                        type: 'traffictile'
                    }
                },
                normalNight: 'normal.night',
                normalNightMobile: 'normal.night.mobile',
                normalNightGrey: 'normal.night.grey',
                normalNightGreyMobile: 'normal.night.grey.mobile',
                normalNightTransit: 'normal.night.transit',
                normalNightTransitMobile: 'normal.night.transit.mobile',
                reducedDay: 'reduced.day',
                reducedNight: 'reduced.night',
                basicMap: {
                    options: {
                        type: 'basetile'
                    }
                },
                mapLabels: {
                    options: {
                        type: 'labeltile',
                        format: 'png'
                    }
                },
                trafficFlow: {
                    options: {
                        base: 'traffic',
                        type: 'flowtile'
                    }
                },
                carnavDayGrey: 'carnav.day.grey',
                hybridDay: {
                    options: {
                        base: 'aerial',
                        variant: 'hybrid.day'
                    }
                },
                hybridDayMobile: {
                    options: {
                        base: 'aerial',
                        variant: 'hybrid.day.mobile'
                    }
                },
                hybridDayTransit: {
                    options: {
                        base: 'aerial',
                        variant: 'hybrid.day.transit'
                    }
                },
                hybridDayGrey: {
                    options: {
                        base: 'aerial',
                        variant: 'hybrid.grey.day'
                    }
                },
                hybridDayTraffic: {
                    options: {
                        variant: 'hybrid.traffic.day',
                        base: 'traffic',
                        type: 'traffictile'
                    }
                },
                pedestrianDay: 'pedestrian.day',
                pedestrianNight: 'pedestrian.night',
                satelliteDay: {
                    options: {
                        base: 'aerial',
                        variant: 'satellite.day'
                    }
                },
                terrainDay: {
                    options: {
                        base: 'aerial',
                        variant: 'terrain.day'
                    }
                },
                terrainDayMobile: {
                    options: {
                        base: 'aerial',
                        variant: 'terrain.day.mobile'
                    }
                }
            }
        },
        HEREv3: {
            /*
             * HERE maps API Version 3.
             * These basemaps are free, but you need an API key. Please sign up at
             * https://developer.here.com/plans
             * Version 3 deprecates the app_id and app_code access in favor of apiKey
             *
             * Supported access methods as of 2019/12/21:
             * @see https://developer.here.com/faqs#access-control-1--how-do-you-control-access-to-here-location-services
             */
            url:
                'https://{s}.{base}.maps.ls.hereapi.com/maptile/2.1/' +
                '{type}/{mapID}/{variant}/{z}/{x}/{y}/{size}/{format}?' +
                'apiKey={apiKey}&lg={language}',
            options: {
                attribution:
                    'Map &copy; 1987-' + new Date().getFullYear() + ' <a href="http://developer.here.com">HERE</a>',
                subdomains: '1234',
                mapID: 'newest',
                apiKey: '<insert your apiKey here>',
                base: 'base',
                variant: 'normal.day',
                maxZoom: 20,
                type: 'maptile',
                language: 'eng',
                format: 'png8',
                size: '256'
            },
            variants: {
                normalDay: 'normal.day',
                normalDayCustom: 'normal.day.custom',
                normalDayGrey: 'normal.day.grey',
                normalDayMobile: 'normal.day.mobile',
                normalDayGreyMobile: 'normal.day.grey.mobile',
                normalDayTransit: 'normal.day.transit',
                normalDayTransitMobile: 'normal.day.transit.mobile',
                normalNight: 'normal.night',
                normalNightMobile: 'normal.night.mobile',
                normalNightGrey: 'normal.night.grey',
                normalNightGreyMobile: 'normal.night.grey.mobile',
                normalNightTransit: 'normal.night.transit',
                normalNightTransitMobile: 'normal.night.transit.mobile',
                reducedDay: 'reduced.day',
                reducedNight: 'reduced.night',
                basicMap: {
                    options: {
                        type: 'basetile'
                    }
                },
                mapLabels: {
                    options: {
                        type: 'labeltile',
                        format: 'png'
                    }
                },
                trafficFlow: {
                    options: {
                        base: 'traffic',
                        type: 'flowtile'
                    }
                },
                carnavDayGrey: 'carnav.day.grey',
                hybridDay: {
                    options: {
                        base: 'aerial',
                        variant: 'hybrid.day'
                    }
                },
                hybridDayMobile: {
                    options: {
                        base: 'aerial',
                        variant: 'hybrid.day.mobile'
                    }
                },
                hybridDayTransit: {
                    options: {
                        base: 'aerial',
                        variant: 'hybrid.day.transit'
                    }
                },
                hybridDayGrey: {
                    options: {
                        base: 'aerial',
                        variant: 'hybrid.grey.day'
                    }
                },
                pedestrianDay: 'pedestrian.day',
                pedestrianNight: 'pedestrian.night',
                satelliteDay: {
                    options: {
                        base: 'aerial',
                        variant: 'satellite.day'
                    }
                },
                terrainDay: {
                    options: {
                        base: 'aerial',
                        variant: 'terrain.day'
                    }
                },
                terrainDayMobile: {
                    options: {
                        base: 'aerial',
                        variant: 'terrain.day.mobile'
                    }
                }
            }
        },
        FreeMapSK: {
            url: 'https://{s}.freemap.sk/T/{z}/{x}/{y}.jpeg',
            options: {
                minZoom: 8,
                maxZoom: 16,
                subdomains: 'abcd',
                bounds: [[47.204642, 15.996093], [49.830896, 22.576904]],
                attribution:
                    '{attribution.OpenStreetMap}, visualization CC-By-SA 2.0 <a href="http://freemap.sk">Freemap.sk</a>'
            }
        },
        MtbMap: {
            url: 'http://tile.mtbmap.cz/mtbmap_tiles/{z}/{x}/{y}.png',
            options: {
                attribution:
                    '{attribution.OpenStreetMap} &amp; USGS'
            }
        },
        CartoDB: {
            url: 'https://{s}.basemaps.cartocdn.com/{variant}/{z}/{x}/{y}{r}.png',
            options: {
                attribution: '{attribution.OpenStreetMap} &copy; <a href="https://carto.com/attributions">CARTO</a>',
                subdomains: 'abcd',
                maxZoom: 20,
                variant: 'light_all'
            },
            variants: {
                Positron: 'light_all',
                PositronNoLabels: 'light_nolabels',
                PositronOnlyLabels: 'light_only_labels',
                DarkMatter: 'dark_all',
                DarkMatterNoLabels: 'dark_nolabels',
                DarkMatterOnlyLabels: 'dark_only_labels',
                Voyager: 'rastertiles/voyager',
                VoyagerNoLabels: 'rastertiles/voyager_nolabels',
                VoyagerOnlyLabels: 'rastertiles/voyager_only_labels',
                VoyagerLabelsUnder: 'rastertiles/voyager_labels_under'
            }
        },
        HikeBike: {
            url: 'https://tiles.wmflabs.org/{variant}/{z}/{x}/{y}.png',
            options: {
                maxZoom: 19,
                attribution: '{attribution.OpenStreetMap}',
                variant: 'hikebike'
            },
            variants: {
                HikeBike: {},
                HillShading: {
                    options: {
                        maxZoom: 15,
                        variant: 'hillshading'
                    }
                }
            }
        },
        BasemapAT: {
            url: 'https://maps{s}.wien.gv.at/basemap/{variant}/{type}/google3857/{z}/{y}/{x}.{format}',
            options: {
                maxZoom: 19,
                attribution: 'Datenquelle: <a href="https://www.basemap.at">basemap.at</a>',
                subdomains: ['', '1', '2', '3', '4'],
                type: 'normal',
                format: 'png',
                bounds: [[46.358770, 8.782379], [49.037872, 17.189532]],
                variant: 'geolandbasemap'
            },
            variants: {
                basemap: {
                    options: {
                        maxZoom: 20, // currently only in Vienna
                        variant: 'geolandbasemap'
                    }
                },
                grau: 'bmapgrau',
                overlay: 'bmapoverlay',
                terrain: {
                    options: {
                        variant: 'bmapgelaende',
                        type: 'grau',
                        format: 'jpeg'
                    }
                },
                surface: {
                    options: {
                        variant: 'bmapoberflaeche',
                        type: 'grau',
                        format: 'jpeg'
                    }
                },
                highdpi: {
                    options: {
                        variant: 'bmaphidpi',
                        format: 'jpeg'
                    }
                },
                orthofoto: {
                    options: {
                        maxZoom: 20, // currently only in Vienna
                        variant: 'bmaporthofoto30cm',
                        format: 'jpeg'
                    }
                }
            }
        },
        nlmaps: {
            url: 'https://service.pdok.nl/brt/achtergrondkaart/wmts/v2_0/{variant}/EPSG:3857/{z}/{x}/{y}.png',
            options: {
                minZoom: 6,
                maxZoom: 19,
                bounds: [[50.5, 3.25], [54, 7.6]],
                attribution: 'Kaartgegevens &copy; <a href="https://www.kadaster.nl">Kadaster</a>'
            },
            variants: {
                'standaard': 'standaard',
                'pastel': 'pastel',
                'grijs': 'grijs',
                'water': 'water',
                'luchtfoto': {
                    'url': 'https://service.pdok.nl/hwh/luchtfotorgb/wmts/v1_0/Actueel_ortho25/EPSG:3857/{z}/{x}/{y}.jpeg',
                }
            }
        },
        NASAGIBS: {
            url: 'https://map1.vis.earthdata.nasa.gov/wmts-webmerc/{variant}/default/{time}/{tilematrixset}{maxZoom}/{z}/{y}/{x}.{format}',
            options: {
                attribution:
                    'Imagery provided by services from the Global Imagery Browse Services (GIBS), operated by the NASA/GSFC/Earth Science Data and Information System ' +
                    '(<a href="https://earthdata.nasa.gov">ESDIS</a>) with funding provided by NASA/HQ.',
                bounds: [[-85.0511287776, -179.999999975], [85.0511287776, 179.999999975]],
                minZoom: 1,
                maxZoom: 9,
                format: 'jpg',
                time: '',
                tilematrixset: 'GoogleMapsCompatible_Level'
            },
            variants: {
                ModisTerraTrueColorCR: 'MODIS_Terra_CorrectedReflectance_TrueColor',
                ModisTerraBands367CR: 'MODIS_Terra_CorrectedReflectance_Bands367',
                ViirsEarthAtNight2012: {
                    options: {
                        variant: 'VIIRS_CityLights_2012',
                        maxZoom: 8
                    }
                },
                ModisTerraLSTDay: {
                    options: {
                        variant: 'MODIS_Terra_Land_Surface_Temp_Day',
                        format: 'png',
                        maxZoom: 7,
                        opacity: 0.75
                    }
                },
                ModisTerraSnowCover: {
                    options: {
                        variant: 'MODIS_Terra_NDSI_Snow_Cover',
                        format: 'png',
                        maxZoom: 8,
                        opacity: 0.75
                    }
                },
                ModisTerraAOD: {
                    options: {
                        variant: 'MODIS_Terra_Aerosol',
                        format: 'png',
                        maxZoom: 6,
                        opacity: 0.75
                    }
                },
                ModisTerraChlorophyll: {
                    options: {
                        variant: 'MODIS_Terra_Chlorophyll_A',
                        format: 'png',
                        maxZoom: 7,
                        opacity: 0.75
                    }
                }
            }
        },
        NLS: {
            // NLS maps are copyright National library of Scotland.
            // http://maps.nls.uk/projects/api/index.html
            // Please contact NLS for anything other than non-commercial low volume usage
            //
            // Map sources: Ordnance Survey 1:1m to 1:63K, 1920s-1940s
            //   z0-9  - 1:1m
            //  z10-11 - quarter inch (1:253440)
            //  z12-18 - one inch (1:63360)
            url: 'https://nls-{s}.tileserver.com/nls/{z}/{x}/{y}.jpg',
            options: {
                attribution: '<a href="http://geo.nls.uk/maps/">National Library of Scotland Historic Maps</a>',
                bounds: [[49.6, -12], [61.7, 3]],
                minZoom: 1,
                maxZoom: 18,
                subdomains: '0123',
            }
        },
        JusticeMap: {
            // Justice Map (http://www.justicemap.org/)
            // Visualize race and income data for your community, county and country.
            // Includes tools for data journalists, bloggers and community activists.
            url: 'https://www.justicemap.org/tile/{size}/{variant}/{z}/{x}/{y}.png',
            options: {
                attribution: '<a href="http://www.justicemap.org/terms.php">Justice Map</a>',
                // one of 'county', 'tract', 'block'
                size: 'county',
                // Bounds for USA, including Alaska and Hawaii
                bounds: [[14, -180], [72, -56]]
            },
            variants: {
                income: 'income',
                americanIndian: 'indian',
                asian: 'asian',
                black: 'black',
                hispanic: 'hispanic',
                multi: 'multi',
                nonWhite: 'nonwhite',
                white: 'white',
                plurality: 'plural'
            }
        },
        GeoportailFrance: {
            url: 'https://wxs.ign.fr/{apikey}/geoportail/wmts?REQUEST=GetTile&SERVICE=WMTS&VERSION=1.0.0&STYLE={style}&TILEMATRIXSET=PM&FORMAT={format}&LAYER={variant}&TILEMATRIX={z}&TILEROW={y}&TILECOL={x}',
            options: {
                attribution: '<a target="_blank" href="https://www.geoportail.gouv.fr/">Geoportail France</a>',
                bounds: [[-75, -180], [81, 180]],
                minZoom: 2,
                maxZoom: 18,
                // Get your own geoportail apikey here : http://professionnels.ign.fr/ign/contrats/
                // NB : 'choisirgeoportail' is a demonstration key that comes with no guarantee
                apikey: 'choisirgeoportail',
                format: 'image/png',
                style: 'normal',
                variant: 'GEOGRAPHICALGRIDSYSTEMS.PLANIGNV2'
            },
            variants: {
                plan: 'GEOGRAPHICALGRIDSYSTEMS.PLANIGNV2',
                parcels: {
                    options: {
                        variant: 'CADASTRALPARCELS.PARCELLAIRE_EXPRESS',
                        style: 'PCI vecteur',
                        maxZoom: 20
                    }
                },
                orthos: {
                    options: {
                        maxZoom: 19,
                        format: 'image/jpeg',
                        variant: 'ORTHOIMAGERY.ORTHOPHOTOS'
                    }
                }
            }
        },
        OneMapSG: {
            url: 'https://maps-{s}.onemap.sg/v3/{variant}/{z}/{x}/{y}.png',
            options: {
                variant: 'Default',
                minZoom: 11,
                maxZoom: 18,
                bounds: [[1.56073, 104.11475], [1.16, 103.502]],
                attribution: '<img src="https://docs.onemap.sg/maps/images/oneMap64-01.png" style="height:20px;width:20px;"/> New OneMap | Map data &copy; contributors, <a href="http://SLA.gov.sg">Singapore Land Authority</a>'
            },
            variants: {
                Default: 'Default',
                Night: 'Night',
                Original: 'Original',
                Grey: 'Grey',
                LandLot: 'LandLot'
            }
        },
        USGS: {
            url: 'https://basemap.nationalmap.gov/arcgis/rest/services/USGSTopo/MapServer/tile/{z}/{y}/{x}',
            options: {
                maxZoom: 20,
                attribution: 'Tiles courtesy of the <a href="https://usgs.gov/">U.S. Geological Survey</a>'
            },
            variants: {
                USTopo: {},
                USImagery: {
                    url: 'https://basemap.nationalmap.gov/arcgis/rest/services/USGSImageryOnly/MapServer/tile/{z}/{y}/{x}'
                },
                USImageryTopo: {
                    url: 'https://basemap.nationalmap.gov/arcgis/rest/services/USGSImageryTopo/MapServer/tile/{z}/{y}/{x}'
                }
            }
        },
        WaymarkedTrails: {
            url: 'https://tile.waymarkedtrails.org/{variant}/{z}/{x}/{y}.png',
            options: {
                maxZoom: 18,
                attribution: 'Map data: {attribution.OpenStreetMap} | Map style: &copy; <a href="https://waymarkedtrails.org">waymarkedtrails.org</a> (<a href="https://creativecommons.org/licenses/by-sa/3.0/">CC-BY-SA</a>)'
            },
            variants: {
                hiking: 'hiking',
                cycling: 'cycling',
                mtb: 'mtb',
                slopes: 'slopes',
                riding: 'riding',
                skating: 'skating'
            }
        },
        OpenAIP: {
            url: 'https://{s}.tile.maps.openaip.net/geowebcache/service/tms/1.0.0/openaip_basemap@EPSG%3A900913@png/{z}/{x}/{y}.{ext}',
            options: {
                attribution: '<a href="https://www.openaip.net/">openAIP Data</a> (<a href="https://creativecommons.org/licenses/by-sa/3.0/">CC-BY-NC-SA</a>)',
                ext: 'png',
                minZoom: 4,
                maxZoom: 14,
                tms: true,
                detectRetina: true,
                subdomains: '12'
            }
        },
        OpenSnowMap: {
            url: 'https://tiles.opensnowmap.org/{variant}/{z}/{x}/{y}.png',
            options: {
                minZoom: 9,
                maxZoom: 18,
                attribution: 'Map data: {attribution.OpenStreetMap} & ODbL, &copy; <a href="https://www.opensnowmap.org/iframes/data.html">www.opensnowmap.org</a> <a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>'
            },
            variants: {
                pistes: 'pistes',
            }
        },
        AzureMaps: {
            url:
                'https://atlas.microsoft.com/map/tile?api-version={apiVersion}' +
                '&tilesetId={variant}&x={x}&y={y}&zoom={z}&language={language}' +
                '&subscription-key={subscriptionKey}',
            options: {
                attribution: 'See https://docs.microsoft.com/en-us/rest/api/maps/render-v2/get-map-tile for details.',
                apiVersion: '2.0',
                variant: 'microsoft.imagery',
                subscriptionKey: '<insert your subscription key here>',
                language: 'en-US',
            },
            variants: {
                MicrosoftImagery: 'microsoft.imagery',
                MicrosoftBaseDarkGrey: 'microsoft.base.darkgrey',
                MicrosoftBaseRoad: 'microsoft.base.road',
                MicrosoftBaseHybridRoad: 'microsoft.base.hybrid.road',
                MicrosoftTerraMain: 'microsoft.terra.main',
                MicrosoftWeatherInfraredMain: {
                    url:
                        'https://atlas.microsoft.com/map/tile?api-version={apiVersion}' +
                        '&tilesetId={variant}&x={x}&y={y}&zoom={z}' +
                        '&timeStamp={timeStamp}&language={language}' +
                        '&subscription-key={subscriptionKey}',
                    options: {
                        timeStamp: '2021-05-08T09:03:00Z',
                        attribution: 'See https://docs.microsoft.com/en-us/rest/api/maps/render-v2/get-map-tile#uri-parameters for details.',
                        variant: 'microsoft.weather.infrared.main',
                    },
                },
                MicrosoftWeatherRadarMain: {
                    url:
                        'https://atlas.microsoft.com/map/tile?api-version={apiVersion}' +
                        '&tilesetId={variant}&x={x}&y={y}&zoom={z}' +
                        '&timeStamp={timeStamp}&language={language}' +
                        '&subscription-key={subscriptionKey}',
                    options: {
                        timeStamp: '2021-05-08T09:03:00Z',
                        attribution: 'See https://docs.microsoft.com/en-us/rest/api/maps/render-v2/get-map-tile#uri-parameters for details.',
                        variant: 'microsoft.weather.radar.main',
                    },
                }
            },
        },
        SwissFederalGeoportal: {
            url: 'https://wmts.geo.admin.ch/1.0.0/{variant}/default/current/3857/{z}/{x}/{y}.jpeg',
            options: {
                attribution: '&copy; <a href="https://www.swisstopo.admin.ch/">swisstopo</a>',
                minZoom: 2,
                maxZoom: 18,
                bounds: [[45.398181, 5.140242], [48.230651, 11.47757]]
            },
            variants: {
                NationalMapColor: 'ch.swisstopo.pixelkarte-farbe',
                NationalMapGrey: 'ch.swisstopo.pixelkarte-grau',
                SWISSIMAGE: {
                    options: {
                        variant: 'ch.swisstopo.swissimage',
                        maxZoom: 19
                    }
                }
            }
        }
    };

    L.tileLayer.provider = function (provider, options) {
        return new L.TileLayer.Provider(provider, options);
    };

    return L;
}));
