29:null 2a:["$","title",null,{"children":"Hydrography Products | USGS National Map | Aaron Kyle Dennis | Observable"}] 2f:T1e71,## [USGS National Hydrography Dataset (NHD)](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer) **View In:** [ArcGIS JavaScript](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer?f=jsapi) [ArcGIS Online Map Viewer](https://www.arcgis.com/home/webmap/viewer.html?url=https%3A%2F%2Fhydro.nationalmap.gov%2Farcgis%2Frest%2Fservices%2Fnhd%2FMapServer&source=sd) [ArcGIS Earth](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/kml/mapImage.kmz) [ArcMap](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer?f=lyr&v=9.3) [ArcGIS Pro](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer?f=pitemx) **View Footprint In:** [ArcGIS Online Map Viewer](https://www.arcgis.com/home/webmap/viewer.html?featurecollection=https%3A%2F%2Fhydro.nationalmap.gov%2Farcgis%2Frest%2Fservices%2Fnhd%2FMapServer%3Ff%3Djson%26option%3Dfootprints&supportsProjection=true&supportsJSONP=true) **Service Description:** The USGS National Hydrography Dataset (NHD) service from The National Map is a comprehensive set of digital spatial data that encodes information about naturally occurring and constructed bodies of surface water (lakes, ponds, and reservoirs), paths through which water flows (canals, ditches, streams, and rivers), and related entities such as point features (springs, wells, stream gages, and dams). The information encoded about these features includes classification and other characteristics, delineation, geographic name, position and related measures, a "reach code" through which other information can be related to the NHD, and the direction of water flow. The network of reach codes delineating water and transported material flow allows users to trace movement in upstream and downstream directions. In addition to this geographic information, the dataset contains metadata that supports the exchange of future updates and improvements to the data. The NHD is available nationwide in two seamless datasets, one based on 1:24,000 (or larger) scale and referred to as high resolution NHD, and the other based on 1:100,000 scale and referred to as medium resolution NHD. The NHD from The National Map supports many applications, such as making maps, geocoding observations, flow modeling, data maintenance, and stewardship. The NHD is commonly combined with other data themes, such as boundaries, elevation, structures, and transportation, to produce general reference base maps. The National Map download client allows free downloads of public domain NHD data in either Esri File Geodatabase or Shapefile formats. For additional information on the NHD, go to https://www.usgs.gov/national-hydrography/national-hydrography-dataset. See https://apps.nationalmap.gov/help/ for assistance with The National Map viewer, download client, services, or metadata. **Map Name:** Layers [Legend](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/legend) [All Layers and Tables](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/layers) [Dynamic Legend](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/legend?dynamicLayers=%5B%5D&) [Dynamic All Layers](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/layers?dynamicLayers=%5B%5D&) **Layers:** * [Point](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/0) (0) * [Point Event](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/1) (1) * [Line - Large Scale ](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/2)(2) * [Flow Direction](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/3) (3) * [Flowline - Small Scale](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/4) (4) * [Flowline - Small Scale (HI, PR, VI, Pacific Territories)](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/5) (5) * [Flowline - Large Scale](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/6) (6) * [Area - Small Scale](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/7) (7) * [Area - Small Scale (HI, PR, VI, Pacific Territories)](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/8) (8) * [Area - Large Scale](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/9) (9) * [Waterbody - Small Scale](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/10) (10) * [Waterbody - Small Scale (HI, PR, VI, Pacific Territories)](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/11) (11) * [Waterbody - Large Scale](https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer/12) (12) **Description:** **Copyright Text:** USGS TNM – National Hydrography Dataset. Data Refreshed July, 2023. **Spatial Reference:** 102100 (3857) **Single Fused Map Cache:** false **Initial Extent:** XMin: -1.2712698060107067E7 YMin: 5319837.208028768 XMax: -1.2678530708463639E7 YMax: 5324996.70743801 Spatial Reference: 102100 (3857) **Full Extent:** XMin: -1.995175568176052E7 YMin: -1622985.3666525595 XMax: 2.002155174725596E7 YMax: 1.1575301958304644E7 Spatial Reference: 102100 (3857) **Units:** esriMeters **Supported Image Format Types:** PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP **Document Info:** Title: NHD Author: U. S. Geological Survey - National Geospatial Program Comments: The USGS National Hydrography Dataset (NHD) service from The National Map is a comprehensive set of digital spatial data that encodes information about naturally occurring and constructed bodies of surface water (lakes, ponds, and reservoirs), paths through which water flows (canals, ditches, streams, and rivers), and related entities such as point features (springs, wells, stream gages, and dams). The information encoded about these features includes classification and other characteristics, delineation, geographic name, position and related measures, a "reach code" through which other information can be related to the NHD, and the direction of water flow. The network of reach codes delineating water and transported material flow allows users to trace movement in upstream and downstream directions. In addition to this geographic information, the dataset contains metadata that supports the exchange of future updates and improvements to the data. The NHD is available nationwide in two seamless datasets, one based on 1:24,000 (or larger) scale and referred to as high resolution NHD, and the other based on 1:100,000 scale and referred to as medium resolution NHD. The NHD from The National Map supports many applications, such as making maps, geocoding observations, flow modeling, data maintenance, and stewardship. The NHD is commonly combined with other data themes, such as boundaries, elevation, structures, and transportation, to produce general reference base maps. The National Map download client allows free downloads of public domain NHD data in either Esri File Geodatabase or Shapefile formats. For additional information on the NHD, go to https://www.usgs.gov/national-hydrography/national-hydrography-dataset. See https://apps.nationalmap.gov/help/ for assistance with The National Map viewer, download client, services, or metadata. Subject: inlandWaters Category: Keywords: a-16,ngda,water – inland,hydrography,NHD,water,drainage,river,stream,canal,ditch,lake,pond,reservoir,swamp,marsh,spring,well,dam,gage,WBD,HU,hydrologic unit,region,subregion,basin,subbasin,watershed,subwatershed,US,WMS AntialiasingMode: Fast TextAntialiasingMode: Force **Supports Dynamic Layers:** true **MaxRecordCount:** 1000 **MaxImageHeight:** 4096 **MaxImageWidth:** 4096 **Supported Query Formats:** JSON, geoJSON **Supports Query Data Elements:** **Min Scale:** 577790.554289 **Max Scale:** 0 **Supports Datum Transformation:** true30:T17ea,## [USGS NHD Plus High Resolution Service](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer) **View In:** [ArcGIS JavaScript](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer?f=jsapi) [ArcGIS Online Map Viewer](https://www.arcgis.com/home/webmap/viewer.html?url=https%3A%2F%2Fhydro.nationalmap.gov%2Farcgis%2Frest%2Fservices%2FNHDPlus_HR%2FMapServer&source=sd) [ArcGIS Earth](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/kml/mapImage.kmz) [ArcMap](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer?f=lyr&v=9.3) [ArcGIS Pro](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer?f=pitemx) **View Footprint In:** [ArcGIS Online Map Viewer](https://www.arcgis.com/home/webmap/viewer.html?featurecollection=https%3A%2F%2Fhydro.nationalmap.gov%2Farcgis%2Frest%2Fservices%2FNHDPlus_HR%2FMapServer%3Ff%3Djson%26option%3Dfootprints&supportsProjection=true&supportsJSONP=true) **Service Description:** The USGS NHDPlus High Resolution service, NHDPlus_HR, a part of The National Map, is a comprehensive set of digital spatial data comprising a nationally seamless network of stream reaches, elevation-based catchment areas, flow surfaces, and value-added attributes that enhance stream network navigation, analysis, and data display. NHDPlus High Resolution (NHDPlus HR) is a scalable geospatial hydrography framework built from the high resolution National Hydrography Dataset, nationally complete Watershed Boundary Dataset, and 3D Elevation Program (3DEP) ? arc-second (10 meter ground spacing) digital elevation model data. The National Map download client allows free downloads of public domain NHDPlus HR data in Esri File Geodatabase format. For additional information on the NHDPlus HR, go to https://www.usgs.gov/national-hydrography/national-hydrography-dataset. See https://apps.nationalmap.gov/help/ for assistance with The National Map viewer, download client, services, or metadata. **Map Name:** Layers [Legend](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/legend) [All Layers and Tables](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/layers) [Dynamic Legend](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/legend?dynamicLayers=%5B%5D&) [Dynamic All Layers](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/layers?dynamicLayers=%5B%5D&) **Layers:** * [NHDPlusGage](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/0) (0) * [NHDPlusSink](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/1) (1) * [NHDPoint](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/2) (2) * [NetworkNHDFlowline](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/3) (3) * [NonNetworkNHDFlowline](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/4) (4) * [FlowDirection](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/5) (5) * [NHDPlusWall](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/6) (6) * [NHDLine](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/7) (7) * [NHDArea](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/8) (8) * [NHDWaterbody](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/9) (9) * [NHDPlusCatchment](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/10) (10) * [NHDPlusBoundaryUnit](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/11) (11) * [WBDHU12](https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer/12) (12) **Description:** **Copyright Text:** USGS TNM – National Hydrography Dataset Plus High Resolution (NHDPlus HR). Data refreshed October, 2022. **Spatial Reference:** 102100 (3857) VCSWkid(5703) LatestVCSWkid(5703) **Single Fused Map Cache:** false **Initial Extent:** XMin: -1.5000532214168265E7 YMin: 5753382.396758993 XMax: -6253690.193441302 YMax: 7074214.245526488 Spatial Reference: 102100 (3857) VCSWkid(5703) LatestVCSWkid(5703) **Full Extent:** XMin: -1.96672789159E7 YMin: -1644316.8040999994 XMax: 1.8558188186899997E7 YMax: 1.1269649384400003E7 Spatial Reference: 102100 (3857) VCSWkid(5703) LatestVCSWkid(5703) **Units:** esriMeters **Supported Image Format Types:** PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP **Document Info:** Title: NHD Plus HR Author: Comments: The USGS NHDPlus High Resolution service, NHDPlus_HR, a part of The National Map, is a comprehensive set of digital spatial data comprising a nationally seamless network of stream reaches, elevation-based catchment areas, flow surfaces, and value-added attributes that enhance stream network navigation, analysis, and data display. NHDPlus High Resolution (NHDPlus HR) is a scalable geospatial hydrography framework built from the high resolution National Hydrography Dataset, nationally complete Watershed Boundary Dataset, and 3D Elevation Program (3DEP) ? arc-second (10 meter ground spacing) digital elevation model data. The National Map download client allows free downloads of public domain NHDPlus HR data in Esri File Geodatabase format. For additional information on the NHDPlus HR, go to https://www.usgs.gov/national-hydrography/national-hydrography-dataset. See https://apps.nationalmap.gov/help/ for assistance with The National Map viewer, download client, services, or metadata. Subject: inlandWaters Category: Keywords: a-16,ngda,water – inland,hydrography,NHD,water,drainage,river,stream,canal,ditch,lake,pond,reservoir,swamp,marsh,spring,well,dam,gage,WBD,HU,hydrologic unit,region,subregion,basin,subbasin,watershed,subwatershed,United St AntialiasingMode: Fast TextAntialiasingMode: Force **Supports Dynamic Layers:** true **MaxRecordCount:** 1000 **MaxImageHeight:** 4096 **MaxImageWidth:** 4096 **Supported Query Formats:** JSON, geoJSON **Supports Query Data Elements:** **Min Scale:** 0 **Max Scale:** 0 **Supports Datum Transformation:** true31:T13d8,## [Watershed Boundary Dataset (WBD)](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer) **View In:** [ArcGIS JavaScript](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer?f=jsapi) [ArcGIS Online Map Viewer](https://www.arcgis.com/home/webmap/viewer.html?url=https%3A%2F%2Fhydro.nationalmap.gov%2Farcgis%2Frest%2Fservices%2Fwbd%2FMapServer&source=sd) [ArcGIS Earth](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/kml/mapImage.kmz) [ArcMap](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer?f=lyr&v=9.3) [ArcGIS Pro](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer?f=pitemx) **View Footprint In:** [ArcGIS Online Map Viewer](https://www.arcgis.com/home/webmap/viewer.html?featurecollection=https%3A%2F%2Fhydro.nationalmap.gov%2Farcgis%2Frest%2Fservices%2Fwbd%2FMapServer%3Ff%3Djson%26option%3Dfootprints&supportsProjection=true&supportsJSONP=true) **Service Description:** Abstract: This file contains Hydrologic Unit (HU) polygon boundaries for the United States, Puerto Rico, and the U.S. Virgin Islands. The data is a seamless National representation of HU boundaries from 2 to 14 digits compiled from U.S. Geological Survey (USGS) National Hydrography Dataset (NHD) and U.S. Department of Agriculture (USDA) National Resources Conservation Service (NRCS) Watershed Boundary Dataset (WBD) sources. Purpose: This data is intended primarily for geographic display and analysis of regional and national data, and can also be used for illustration purposes at intermediate or small scales (1:250,000 to 1:2,000,000). See https://apps.nationalmap.gov/help/ for assistance with The National Map viewer, download client, services, or metadata. **Map Name:** Layers [Legend](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/legend) [All Layers and Tables](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/layers) [Dynamic Legend](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/legend?dynamicLayers=%5B%5D&) [Dynamic All Layers](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/layers?dynamicLayers=%5B%5D&) **Layers:** * [WBDLine](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/0) (0) * [2-digit HU (Region)](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/1) (1) * [4-digit HU (Subregion)](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/2) (2) * [6-digit HU (Basin)](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/3) (3) * [8-digit HU (Subbasin)](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4) (4) * [10-digit HU (Watershed)](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/5) (5) * [12-digit HU (Subwatershed)](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/6) (6) * [14-digit HU](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/7) (7) * [16-digit HU](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/8) (8) **Description:** **Copyright Text:** USGS WBD - Watershed Boundary Dataset. Data refreshed July, 2023. **Spatial Reference:** 102100 (3857) **Single Fused Map Cache:** false **Initial Extent:** XMin: -8500525.395643428 YMin: 4728474.4678900875 XMax: -8432190.692356572 YMax: 4738793.466708573 Spatial Reference: 102100 (3857) **Full Extent:** XMin: -1.995175568199517E7 YMin: -1644316.0005109496 XMax: 2.0021551747347146E7 YMax: 1.1554273612629697E7 Spatial Reference: 102100 (3857) **Units:** esriMeters **Supported Image Format Types:** PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP **Document Info:** Title: WBD Author: U. S. Geological Survey - National Geospatial Program Comments: Abstract: This file contains Hydrologic Unit (HU) polygon boundaries for the United States, Puerto Rico, and the U.S. Virgin Islands. The data is a seamless National representation of HU boundaries from 2 to 14 digits compiled from U.S. Geological Survey (USGS) National Hydrography Dataset (NHD) and U.S. Department of Agriculture (USDA) National Resources Conservation Service (NRCS) Watershed Boundary Dataset (WBD) sources. Purpose: This data is intended primarily for geographic display and analysis of regional and national data, and can also be used for illustration purposes at intermediate or small scales (1:250,000 to 1:2,000,000). See https://apps.nationalmap.gov/help/ for assistance with The National Map viewer, download client, services, or metadata. Subject: inlandWaters Category: Keywords: a-16,ngda,water – inland,hydrography,NHD,water,drainage,river,stream,canal,ditch,lake,pond,reservoir,swamp,marsh,spring,well,dam,gage,WBD,HU,hydrologic unit,region,subregion,basin,subbasin,watershed,subwatershed,REST,WMS AntialiasingMode: Fast TextAntialiasingMode: Force **Supports Dynamic Layers:** true **MaxRecordCount:** 1000 **MaxImageHeight:** 4096 **MaxImageWidth:** 4096 **Supported Query Formats:** JSON, geoJSON **Supports Query Data Elements:** **Min Scale:** 0 **Max Scale:** 0 **Supports Datum Transformation:** true32:[] 2d:{"id":"3102ce32041c6515","slug":"usgs-nationalmap-hydro","title":"Hydrography Products | USGS National Map","thumbnail":"e069765690a67ed4eef4929ae7a5bec832f70b658871fb476ab9f913a9281965","access_level":"public","create_time":"$D2023-07-27T02:54:09.608Z","update_time":"$D2023-07-28T23:42:27.337Z","view_time":null,"first_public_time":"$D2023-07-27T04:05:13.038Z","has_unpublished_edits":null,"fork":false,"stars":3,"starred":false,"owner":{"type":"team","id":"8d652a601386fcf4","login":"aaronkyle","name":"Aaron Kyle Dennis","avatar_url":"https://avatars-next.observableusercontent.com/eb6d0b32ccc6c8febbf105ce4d2a938819bcbd1c6a2c108d3a9c01745d3590f2","tier":"starter_2024"},"version":150,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"a7fa3027921865cf","login":"aaronkyle","name":"Aaron Kyle Dennis","avatar_url":"https://avatars-next.observableusercontent.com/eb6d0b32ccc6c8febbf105ce4d2a938819bcbd1c6a2c108d3a9c01745d3590f2","tier":null}],"members":[{"type":"individual","id":"a7fa3027921865cf","login":"aaronkyle","name":"Aaron Kyle Dennis","avatar_url":"https://avatars-next.observableusercontent.com/eb6d0b32ccc6c8febbf105ce4d2a938819bcbd1c6a2c108d3a9c01745d3590f2","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":true,"trashed":false,"lapsed":null,"subscribed":null,"forks":1,"collection":{"id":"0e7285e03c45c6ac","slug":"gis","title":"GIS","owner":{"id":"8d652a601386fcf4","login":"aaronkyle","name":"Aaron Kyle Dennis"}},"type":"notebook","body":{"title":"Hydrography Products | USGS National Map","cells":[{"id":19,"value":"# Hydrography Products | USGS National Map","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":32,"value":"As one of the cornerstones of the U.S. Geological Survey's (USGS) National Geospatial Program, [The National Map](https://www.usgs.gov/programs/national-geospatial-program/national-map) is a collaborative effort among the USGS and other Federal, State, and local partners to improve and deliver topographic information for the Nation. It has many uses ranging from recreation to scientific analysis to emergency response. ","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":107,"value":"This notebook loads [National Hydrography Products](https://www.usgs.gov/national-hydrography/access-national-hydrography-products) shared from the ArcGIS REST Services Directory at [`hydro.nationalmap.gov`](https://hydro.nationalmap.gov/arcgis/rest/services).","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":112,"value":"---","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":123,"value":"_Please be patient while the data load._","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":0,"value":"map = {\n\n let container = DOM.element(\"div\", {\n style: `width:${width}px;height:${width / 1.6}px`\n });\n yield container;\n\n// Create the Leaflet map\nvar map = L.map(container).setView([42.1829393,-73.199016], 15); // Set the initial center and zoom level\n\n// Add the basemap\nvar basemapLayer = L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {\n attribution: 'Map data © OpenStreetMap contributors'\n}).addTo(map);\n\nconst controlLayers = new L.control.layers(\n {\n \"Open Street Maps\": osm().addTo(map),\n \"World Imagery\": imagery(),\n \"World Topo Map\": topo()\n },\n {\n \"hydrography\": nhd.addTo(map),\n \"hydrography - high res.\": nhdplus_hr.addTo(map),\n \"watershed\": wbd.addTo(map),\n },\n { position: \"topright\", collapsed: false }\n );\n map.addControl(await controlLayers);\n \n\n\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":24,"value":"**Data Source:**\n\n[U.S. Department of the Interior](http://www.doi.gov/) | [U.S. Geological Survey](http://www.usgs.gov/)
\n[The National Map - Data Delivery](https://www.usgs.gov/the-national-map-data-delivery/)
\nPage Contact Email: tnm_help@usgs.gov
\nPage Last Modified: Wed Jul 26 17:53:06 MDT 2023","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":85,"value":"---","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":87,"value":"toc()","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":83,"value":"---","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":28,"value":"nhd = esri.dynamicMapLayer({\n url: \"https://hydro.nationalmap.gov/arcgis/rest/services/nhd/MapServer\",\n maxZoom: 16 // Set the maximum zoom level for the layer\n })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":54,"value":"$2f","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":78,"value":"---","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":34,"value":"nhdplus_hr = esri.dynamicMapLayer({\n url: \"https://hydro.nationalmap.gov/arcgis/rest/services/NHDPlus_HR/MapServer\",\n maxZoom: 16 // Set the maximum zoom level for the layer\n })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":56,"value":"$30","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":76,"value":"---","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":36,"value":"wbd = esri.dynamicMapLayer({\n url: \"https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer\",\n maxZoom: 16 // Set the maximum zoom level for the layer\n })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":58,"value":"$31","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":73,"value":"---","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":99,"value":"## Helpers","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":65,"value":"import {toc} from '@aaronkyle/toc'","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":14,"value":"imagery = () => L.tileLayer(\n 'https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}',\n {\n attribution:\n 'Tiles © Esri — Source: Esri, i-cubed, USDA, USGS, AEX, GeoEye, Getmapping, Aerogrid, IGN, IGP, UPR-EGP, and the GIS User Community',\n maxZoom: 17\n }\n)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":12,"value":"topo = () => L.tileLayer(\n 'https://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer/tile/{z}/{y}/{x}',\n {\n attribution:\n 'Tiles © Esri — 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',\n maxZoom: 17\n }\n )","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":10,"value":"osm = () => L.tileLayer(\n 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', \n {\n attribution: 'Wikimedia maps beta | © OpenStreetMap contributors'\n }\n)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":127,"value":"esri = await require(\"esri-leaflet@latest\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":126,"value":"L = {\n // Load Leaflet and it's CSS file\n const L = await require(\"leaflet@latest\");\n if (!L._css) {\n document.head.appendChild(\n (L._css = html`\n \n `)\n );\n }\n\n return L;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W32","stdlib":"1","titling":"auto"}} 2e:"$2d:body"