Data Available Via 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:

	Atmospheric Infrared Sounder (AIRS) Near-Real-Time BT_diff_SO2 (an indicator of volcanic SO2), RGB, and CO images are available for the near-real-time AIRS Calibrated Radiance data.
	Atmospheric Infrared Sounder (AIRS) Data Products Visible, infrared and microwave sensors provide daily global atmospheric temperature moisture and trace gases throughout the atmosphere. AIRS WMS layers include surface temperature, total column ozone, CO and water vapor, cloud fraction, and other atmospheric dynamic parameters.
	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.

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. GES DISC GetCapabilities request:  http://g0hep12u.ecs.nasa.gov/mapserv-bin/wms_ogc?SERVICE=WMS&VERSION=1.1.1&REQUEST=GETCAPABILITIES

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