How to use Nasa Blue Marble raw images
Paco Regodón
mapserver at METEOLOGICA.ES
Tue Jan 31 04:33:56 PST 2006
Hello, i downloaded a 10GB raw image from Nasa Earth Observatory - Blue
Marble (http://earthobservatory.nasa.gov/Newsroom/BlueMarble/)
It is a world image at 500m/pixel resolution in raw rgb format,
86400x42600 pixels.
I want to use it with mapserver, and have created a gdal VRT file:
<VRTDataset rasterXSize="86400" rasterYSize="42600">
<SRS></SRS>
<GeoTransform></GeoTransform>
<VRTRasterBand dataType="Byte" band="1" subClass="VRTRawRasterBand">
<ColorInterp>Red</ColorInterp>
<SourceFilename
relativetoVRT="1">world.topo.bathy.200407.3x86400x43200.bin</SourceFilename>
<ImageOffset>0</ImageOffset>
<PixelOffset>3</PixelOffset>
<LineOffset>259200</LineOffset>
</VRTRasterBand>
<VRTRasterBand dataType="Byte" band="2" subClass="VRTRawRasterBand">
<ColorInterp>Green</ColorInterp>
<SourceFilename
relativetoVRT="1">world.topo.bathy.200407.3x86400x43200.bin</SourceFilename>
<ImageOffset>1</ImageOffset>
<PixelOffset>3</PixelOffset>
<LineOffset>259200</LineOffset>
</VRTRasterBand>
<VRTRasterBand dataType="Byte" band="3" subClass="VRTRawRasterBand">
<ColorInterp>Blue</ColorInterp>
<SourceFilename
relativetoVRT="1">world.topo.bathy.200407.3x86400x43200.bin</SourceFilename>
<ImageOffset>2</ImageOffset>
<PixelOffset>3</PixelOffset>
<LineOffset>259200</LineOffset>
</VRTRasterBand>
</VRTDataset>
I still need to georeference the image. How can i fill the SRS and
GeoTransform labels?
Also, is there some tool to convert this too big file into a tile of
smaller files?
thanks for your help,
Paco Regodón
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