DDS/BIL(World Wind Data Formats) Extension¶
This output module allows GeoServer to output imagery and terrain in formats understood by NASA World Wind. The mime-types supported are:
- Direct Draw Surface (DDS) - image/dds. This format allows efficient loading of textures to the GPU and takes the task off the WorldWind client CPU in converting downloaded PNG, JPEG or TIFF tiles. The DDS compression is done using DXT3 with help from the worldwind library on server side.
- Binary Interleaved by Line(BIL) - image/bil. This is actually a very simple raw binary format produced using the RAW Image Writer. The supplied GridCoverage2D undergoes appropriate subsampling, reprojection and bit-depth conversion. The output can be requested as 16bit Int or 32bit Float.
Installing the DDS/BIL extension¶
Make sure to match the version of the extension to the version of the GeoServer instance!
Extract the contents of the archive into the WEB-INF/lib directory of the GeoServer installation.
Checking if the extension is enabled¶
Once the extension is installed, the provided mime-types should appear in the layer preview dropbox as shown:
The mime-types will also be listed in the GetCapabilities document:
Configuring World Wind to access Imagery/Terrain from GeoServer¶
Please refer to the WorldWind Forums for instructions on how to setup World Wind to work with layers published via GeoServer. For image layers(DDS) the user need to create a WMSTiledImageLayer either via XML configuration or programmatically. For terrain layers (BIL) the equivalent class is WMSBasicElevationModel.