| ArcGIS DynamicMapLayer | 
urn:x-esri:serviceType:ArcGIS#DynamicMapLayer | 
- | 
| ArcGIS FeatureLayer | 
urn:x-esri:serviceType:ArcGIS#FeatureLayer | 
- | 
| ArcGIS ImageMapLayer | 
urn:x-esri:serviceType:ArcGIS#ImageMapLayer | 
- | 
| ArcGIS TiledMapLayer | 
urn:x-esri:serviceType:ArcGIS#TiledMapLayer | 
- | 
| Cloud Optimized GeoTIFF (COG) | 
https://github.com/cogeotiff/cog-spec | 
- | 
| Data dictionary / supplemental documentation | 
http://lccn.loc.gov/sh85035852 | 
Functions as a link to download documentation (not a viewer) | 
| Download file | 
http://schema.org/downloadUrl | 
Link to download file (for multiple files  see the multiple downloads guidelines) | 
| GeoJSON | 
http://geojson.org/geojson-spec.html | 
- | 
| Full layer description | 
http://schema.org/url | 
To view further descriptive information about the layer or a link to its landing page | 
| International Image Interoperability Framework (IIIF) Annotation | 
https://iiif.io/api/extension/georef/1/context.json | 
To display georeferenced maps that have IIIF Annotations and/or are part of Allmaps | 
| International Image Interoperability Framework (IIIF) Image API | 
http://iiif.io/api/image | 
Load the image viewer using Leaflet-IIIF | 
| International Image Interoperability Framework (IIIF) Presentation API Manifest | 
http://iiif.io/api/presentation#manifest | 
View the IIIF manifest - uses the Clover viewer by default https://samvera-labs.github.io/clover-iiif/docs | 
| Metadata in FGDC | 
http://www.opengis.net/cat/csw/csdgm | 
Provides an HTML view of an XML file in the FGDC standard | 
| Metadata in HTML | 
http://www.w3.org/1999/xhtml | 
View structured metadata in any standard expressed as HTML | 
| Metadata in ISO 19139 | 
http://www.isotc211.org/schemas/2005/gmd/ | 
Provides an HTML view of an XML file in the ISO 19139 standard | 
| Metadata in MODS | 
http://www.loc.gov/mods/v3 | 
Provides a raw XML view of metadata in the MODS format | 
| oEmbed | 
https://oembed.com | 
- | 
| OpenIndexMap | 
https://openindexmaps.org | 
Provides an interactive preview of a GeoJSON file formatted as an OpenIndexMap | 
| PMTiles | 
https://github.com/protomaps/PMTiles | 
- | 
| Tile Mapping Service (TMS) | 
https://wiki.osgeo.org/wiki/Tile_Map_Service_Specification | 
- | 
| TileJSON | 
https://github.com/mapbox/tilejson-spec | 
- | 
| Web Coverage Service (WCS) | 
http://www.opengis.net/def/serviceType/ogc/wcs | 
- | 
| Web Feature Service (WFS) | 
http://www.opengis.net/def/serviceType/ogc/wfs | 
Provides a to download generated vector datasets (GeoJSON,  shapefile) | 
| Web Mapping Service (WMS) | 
http://www.opengis.net/def/serviceType/ogc/wms | 
Provides a service to visually preview a layer and inspect its features | 
| WMTS | 
http://www.opengis.net/def/serviceType/ogc/wmts | 
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| XYZ tiles | 
https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames | 
Link to an XYZ tile server |