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MODAPS Web Coverage Service (WCS)

Overview

The Open Geospatial Consortium, Inc. (OGC) Web Coverage Service (WCS) provides an open specification for sharing datasets on the Web. MODAPS utilizes OGC WCS version 1.0.0 to provide its public datasets (WCS Coverage) to the public. Unlike Web Mapping Services (WMS), the MODAPS WCS service returns data in a format that can be used as input for analysis and modeling.

The WCS services are:

• GetCapabilities: Provides a description of MODAPS service provider, list of available metadata for the defined product and collection and a brief description of the data collection
• DescribeCoverage: Returns a full description of one or more coverages
• GetCoverage: Returns a coverage in a format defined by requester
  • The MODAPS WCS GetCoverage request ONLY handles one coverage at a time
  • The MODAPS WCS GetCoverage request ONLY handles one band for one day
  • The MODAPS WCS GetCoverage request ONLY support limited geospatial boundary
  • The MODAPS WCS GetCoverage request ONLY returns one file as a response to a valid request

To learn more about MODAPS Products please see the LAADS Webpage: http://modis.gsfc.nasa.gov/data/dataprod/

Support for Coordinate Reference Systems:

The European Petroleum Survey Group (EPSG) codes are numeric codes associated with coordinate system definitions. For example, EPSG:4326 is geographic WGS84, and EPSG:32611 is UTM zone 11.

The current version of MODAPS WCS supports all existing valid EPSGs and two auto CRSs urn:ogc:def:crs:OGC:1.3:AUTO2:42001:LAT:LON and urn:ogc:def:crs:OGC:1.3:AUTO2:42002:LAT:LON.

A complete list of EPSGs is available at http://www.geotoolkit.org/modules/referencing/supported-codes.html

GetCapabilities, DescribeCoverage, and GetCoverage:

MODAPS has over 548 products and over 25 collections. The existing WCS GetCapabilities schema isn't able to return all MODAPS products and their coverage within one response. MODAPS WCS design resolved this limitation by embedding product name and collection value within the request URL.

Product and Collection Selection

The following utility is designed to help our users select desired collection and product names. Users can select collection and product names, and then an appropriate GetCapabilities URL is generated.

Collection:

Product:

Known Issues

• JPG output formats are currently not working
• InterpolationMethod "bilinear" is non-functional in this release
• bbox must always be defined in degrees, associated with the geographic CRS defined in the request
• File provided by getCoverage is always named coverage.* ('.*' file extension will be determined by the requested output format)
• Geotiff conversion for some files fails ( returns 0 byte response )
• Asking for more than 1 band in a 3-4 dimensional coverage should return an error, instead returns files with 1 band
• Exceptions have .tif extension instead of .xml

Examples

Product MOD09

Product MOD021KM ( with 3rd axis )

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