Brief Introduction
  • What is GeoBrain WCS4DEM?
    GeoBrain WCS4DEM is an OGC-compliant Web Coverage Service, which is used to process multi-source DEM data. Elevations from the Shuttle Radar Topography Mission (SRTM), the Global Land Survey Digital Elevation Model (GLSDEM), Coastal and ridge multibeam, estimated topography (SRTM30_Plus), The National Elevation Dataset (NED) data at 30m reoslution (NED_30m_USA) and GTOPO data at 30 arc second resolution are archived.
  • Why do we need WCS for DEM data?
    Each single DEM file covered a relevant spatial area, was stored in a fixed format and was rectified to an corresponding projection. But in many applications, the requested area is covered multiple DEM data or just a portion of one DEM file, and the user wants to customize the DEM into another projection or format. Based on this requirement, we (CSISS) developed a WCS to process such requests. The WCS4DEM will execute mosaic, subset, re-projection and re-format operations in the back end.
  • Who should use WCS4DEM?
    If you need DEM data in your application, such as a scientific model or workflow, WCS4DEm may be a good choice. WCS4DEM will accept the requested URL and return the data stream or link address.
  • How do you use WCS4DEM?
    The following parts will address more detailed WCS operation. The GetCapabilities and DescribeCoverage operations will give the user descriptive information on WCS4DEM server and the selected DEM coverage, and the GeoCoverage will be process your request and return the data stream or link address.
GetCapabilities operation
  • The Get Capabilities Operation allows WCS clients to retrieve service metadata from a WCS server. The response to a GetCapabilities request shall be an XML document containing service metadata about the server, usually including summary information about the data collections from which coverages may be requested.
  • Currently, multiple coverages were supported by GeoBrain WCS4DEM: SRTM_30m_USA, SRTM_90m_Global, GTOPO_30arc_Global, GLSDEM_90m_Global, SRTM30_Plus_Global and NED_30m_USA. ASTER_30m_Global was not supported because of the distribution license.
  • URL: http://geobrain.laits.gmu.edu/cgi-bin/gbwcs-dem?service=wcs&version=1.0.0&request=getcapabilities
DescribeCoverage operation
GetCoverage operation
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