Spatial Reference System/Open Geospatial Consortium (OGC) Service Matrix

Spatial Reference System
Name		 Spatial Reference System
EPSG Code		 Web Services for which this Spatial Reference System is Supported
Geographic NAD 83EPSG: 4269SDMNAD83Geographic.wfs1a
SDM.wms
Geographic WGS 84EPSG: 4326SDMWGS84Geographic.wfs1b
SDM.wms
Web Mercator2a EPSG: 38572b SDMWM.wfs1c
SDM.wms

1a 1b 1c No explicit reference to the corresponding spatial reference system is required because the corresponding spatial reference system is the only spatial reference system supported by this web service. Back to 1a content  Back to 1b content  Back to 1c content

2a 2b Soil Data Access uses "Web Mercator" and "epsg:3857" to describe the coordinate system used to match that used by Google Maps and Microsoft Bing Maps. Strictly speaking this Google/Microsoft/Soil Data Access pseudo-"Web Mercator" coordinate system does not match a true "Web Mercator" and "epsg:3857" coordinate system as defined by "epsg:3857". For details consult the article The Google Maps / Bing Maps Spherical Mercator Projection. Back to 2a content  Back to 2b content

Notes:
  • NAD83 is an acronym for North American Datum of 1983. The North American Datum (NAD) is the datum now used to define the geodetic network in North America. A datum is a formal description of the shape of the Earth along with an "anchor" point for the coordinate system. In surveying, cartography, and land-use planning, two North American Datums are in use: the North American Datum of 1927 (NAD 27) and the North American Datum of 1983 (NAD 83). Both are geodetic reference systems based on slightly different assumptions and measurements. For details, consult the following web page: NAD83.
  • WGS84 is an acronym for World Geodetic System of 1984. The World Geodetic System (WGS) is a standard for use in cartography, geodesy, and navigation including GPS. The latest revision is WGS 84 (also known as WGS 1984), established in 1984. For details, consult the following web page: WGS84.
  • Web Mercator: Web Mercator, Google Web Mercator, Spherical Mercator, WGS 84 Web Mercator or WGS 84/Pseudo-Mercator is a variant of the Mercator projection and is the de facto standard for Web mapping applications. It is used by virtually all major online map providers, including Google Maps, Bing Maps, OpenStreetMap, Mapquest, Esri, Mapbox, and many others. For details, consult the following web page: Web Mercator.
  • EPSG is an acronym for European Petroleum Survey Group. They publish a database of coordinate system information plus some very good related documents on map projections and datums. For details, consult the following web page: EPSG.