WEB MAP SERVICE

AG WMS Map Layers

There are currently 2 individual base layers provided by this Web Map Service (WMS) for TRMM data.

Service Requests

GetCapabilities

To get infomrmation about this WMS and the available map layers, invoke "GetCapabilities". WMS responds to the "GetCapabilities" request with an XML file to save or to display in a browser window. The form of the URL-encoded request is:

http://g0hep12u.ecs.nasa.gov/mapserv-bin/wms_ogc?VERSION=1.1.1&request=Getcapabilities&service=WMS

The information returned from the request results is an XML file which contains all the layers that can be selected for the creation of a map. The unique layer names and their description as well as projection options are also provided. For more details about the "GetCapabilities" request consult the:

OpenGIS® Web Map Server Interfaces Implementation Specification, Version 1.1.1.

GetMap

The "GetMap" request is used to produce a map with base layers. The following parameters are required to form the URL request:  VERSION, REQUEST, SRS, BBOX, WIDTH, HEIGHT, LAYERS, TIME, STYLES and FORMAT.  For more details on these parameters and others, please consult the on-line document:

OpenGIS® Web Map Server Interfaces Implementation Specification, Version 1.1.1.

The following URL-encoded string is an example of a functional GetMap request:

• "version" is 1.1.1,
• "request" is GetMap
• "bbox" are -180,-90,180,90
• "width" and "height" parameters specify a rectangle of pixels 1500 by 800 in dimension
• "layers" are bluemarble and TRMM_3B42_V6_DAILY
• "time" is 2006-09-11
• "format" of the map image returned is PNG

http://g0hep12u.ecs.nasa.gov/mapserv-bin/wms_ogc?VERSION=1.1.1&request=GetMap&
BBOX=-180,90,180,90&WIDTH=1500&HEIGHT=800&LAYERS=bluemarble,TRMM_3B42_
V6_DAILY&TIME=2006-09-11&FORMAT=PNG

Please note that each parameter is separated by an & and values are assigned using the = sign.