Examples of ORNL DAAC OGC Services HTTP GET Requests

Fig. 1: Sea Surface Temperature in December, 1990

The above image was generated with the HTTP GET request below:

• https://webmap.ornl.gov/ogcbroker/wms?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&LAYERS=980_13&FORMAT=image/png&STYLES=default&TRANSPARENT=true&SRS=EPSG:4326&BBOX=-180,-90,180,90&WIDTH=500&HEIGHT=250&TIME=1990-12&EXCEPTIONS=application/vnd.ogc.se_xml&originator=SDAT

• https://webmap.ornl.gov/ogcbroker/wms?: URL of the ORNL DAAC WMS service
• SERVICE=WMS: this is a WMS request
• VERSION=1.1.1: indicate the format of this request is compatible with OGC WMS specification version 1.0.0
• REQUEST=GetMap: this is a GetMap request
• LAYERS=980_13: 980_13 (Sea Surface Temperature in December, 1990) is the requested layer. The list of available layers can be found in the ORNL DAAC WMS Capabilities document
• FORMAT=image/png: the generated map will be in PNG format
• STYLES=default: choose the default style to render the map
• TRANSPARENT=true: the generated map will be transparent in areas with nodata value
• SRS=EPSG:4326: the generated map will be in EPSG:4326 (WGS84) coordinate reference system
• BBOX=-180,-90,180,90: the bounding box of the requested map
• WIDTH=500: width (in pixels) of the requested map
• HEIGHT=250: height (in pixels) of the requested map
• TIME=1990-12: requested time step
• EXCEPTIONS=application/vnd.ogc.se_xml: if there is an exception from the ORNL WMS service, the error message will be in application/vnd.ogc.se_xml format
• originator=SDAT: this means the request was sent by the Spatial Data Access Tool (SDAT)

Fig. 2: Legend of Sea Surface Temperature in December, 1990

The above legend image was generated with the HTTP GET request below:

• https://webmap.ornl.gov/ogcbroker/wms?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetLegendGraphic&FORMAT=image/gif&LAYER=980_13&TIME=1990-12&originator=SDAT

• https://webmap.ornl.gov/ogcbroker/wms?: URL of the ORNL DAAC WMS service
• SERVICE=WMS: this is a WMS request
• VERSION=1.1.1: indicate the format of this request is compatible with OGC WMS specification version 1.0.0
• REQUEST=GetLegendGraphic: this is a GetLegendGraphic request and the purpose is to get a legend image for a map
• LAYERS=980_13: 980_13 (Sea Surface Temperature in December, 1990) is the requested layer. The list of available layers can be found in the ORNL DAAC WMS Capabilities document
• FORMAT=image/gif: the generated legend image will be in GIF format
• TIME=1990-12: specify the time step
• originator=SDAT: this means the request was sent by the Spatial Data Access Tool (SDAT)

• https://webmap.ornl.gov/ogcbroker/wcs?SERVICE=WCS&VERSION=1.0.0&REQUEST=GetCoverage&COVERAGE=980_13&CRS=EPSG:4326&BBOX=-180,-90,180,90&RESX=1&RESY=1&FORMAT=AAIGrid_FLOAT32&TIME=1990-12&BANDS=1&INTERPOLATION=NEAREST&ORIGINATOR=SDAT

• https://webmap.ornl.gov/ogcbroker/wcs?: URL of the ORNL DAAC WCS service
• SERVICE=WCS: this is a WCS request
• VERSION=1.0.0: indicate the format of this request is compatible with OGC WCS specification version 1.0.0
• REQUEST=GetCoverage: this is a GetCoverage request
• COVERAGE=980_13: 980_13 (Sea Surface Temperature in December, 1990) is the requested coverage. The list of available coverages can be found in the ORNL DAAC WCS Capabilities document.
• CRS=EPSG:4326: the downloaded data will be in EPSG:4326 (WGS84) coordinate reference system
• BBOX=-180,-90,180,90: the bounding box of the requested data
• RESX=1: spatial resolution of the requested data in X direction is 1 degree
• RESY=1: spatial resolution of the requested data in Y direction is 1 degree
• FORMAT=AAIGrid_FLOAT32: the downloaded data will be in Arc/Info ASCII Grid (FLOAT32) format
• TIME=1990-12: requested time step
• BANDS=1: subset the 1st band in the original data
• INTERPOLATION=NEAREST: use "nearest neighbor" interpolation method if resampling process is needed
• originator=SDAT: this means the request was sent by the Spatial Data Access Tool (SDAT)