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OGC WEB MAP SERVICE

The Open Geospatial Consortium (OGC) Web Map Service (WMS) is an interface that allows the use of data and enables clients to build customized maps with data coming from a different network.

The GES DISC provides the following data through the WMS interface:

TRMM
Tropical Rainfall Measurement Mission (TRMM) Gridded Rainfall Data
The Tropical Rainfall Measuring Mission is the first mission dedicated to measuring tropical and subtropical rainfall through microwave and visible infrared sensors, and includes the first spaceborne rain radar.
AIRS
Atmospheric Infrared Sounder (AIRS) Data Products
Global coverage from visible, infrared, and microwave sensors that provide measurements for temperature at an accuracy of 1°C in layers 1 km thick and humidity with an accuracy of 20% in layers 2 km thick in the troposphere will be obtained twice daily (day and night) on a 1:30pm sun synchronous orbit from a 705-km altitude.


How does it work?

OGC WMS interacts with their clients via the HTTP protocol. In most cases, a WMS is a CGI program. The WMS specification defines a number of request types, and for each of request type it defines a set of query parameters and associated behaviors. Listed below are the requests available from the WMS:

  • GetCapabilities: return an XML document with metadata containing Web Map Service Information.
  • GetMap: return an image as specified by a user.
  • GetLegendGraphic: returns a legend image (colour bar) for the requested layer.


Valid GetMap Request According to the WMS Specification

  • VERSION=version: Request version
  • REQUEST=GetMap: Request name
  • LAYERS=layer_list: Comma-separated list of one or more map layers.
  • SRS=namespace: Spatial Reference System.
  • BBOX=minx,miny,maxx,maxy: Bounding box corners (lower left, upper right) in SRS units.
  • WIDTH=output_width: Width in pixels of map picture.
  • HEIGHT=output_height: Height in pixels of map picture.
  • FORMAT=output_format: Output format of map.
  • TIME=layer_date: Date of the data requested (YYYY-MM-DD)


Examples
  GetCapabilities
  This request will return a XML file that can be read by an OGC compliant client.
 
  • URL=http://g0hep12u.ecs.nasa.gov/mapserv-bin/wms_ogc?
  • SERVICE=WMS
  • VERSION=1.1.1
  • REQUEST=GETCAPABILITIES
GES DISC GetCapabilities request
  GetMap
 
  • URL=http://g0hep12u.ecs.nasa.gov/mapserv-bin/wms_ogc?
  • SERVICE=WMS
  • VERSION=1.1.1
  • REQUEST=GETMAP
  • LAYER=AIRX3STD_TOTO3_D (derived from getcapabilities)
  • TIME=2005-08-26
  • BBOX=-180,-90,180,90
  • WIDTH=1000
  • HEIGHT=800
Monthly Total Integrated Column Ozone Burden
 
  GetLegendGraphic
  This request will return the color scale information used to create the image.
  • URL=http://g0hep12u.ecs.nasa.gov/mapserv-bin/wms_ogc?
  • SERVICE=WMS
  • VERSION=1.1.1
  • REQUEST=GETLEGENDGRAPHIC
  • LAYER=AIRX3STD_TOTO3_D
  • FORMAT=image/png
  Monthly Total Integrated Column Ozone Burden , Color Scale


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  • Last updated: February 19, 2008 20:45:23 GMT