Helmut,
From the doc, the ACE tiles are just raw files. So this is the perfect
use case for using VRT descriptions for raw files :
http://www.gdal.org/gdal_vrttut.html#gdal_vrttut_vrt
For example, for the 30N000E.ACE file, you can create a 30N000E.VRT
description file
<VRTDataset rasterXSize="1800" rasterYSize="1800">
<SRS>GEOGCS["WGS
84",DATUM["WGS_1984",SPHEROID["WGS
84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]]</SRS>
<GeoTransform>0, 0.0083333333333333332, 0.0, 45, 0.0,
-0.0083333333333333332</GeoTransform>
<VRTRasterBand dataType="Int16" band="1" subClass="VRTRawRasterBand">
<SourceFilename relativetoVRT="1">30N000E.ACE</SourceFilename>
<NoDataValue>-500.0</NoDataValue>
<ImageOffset>0</ImageOffset>
<PixelOffset>2</PixelOffset>
<LineOffset>3600</LineOffset>
<ByteOrder>LSB</ByteOrder>
</VRTRasterBand>
</VRTDataset>
This VRT file can then be used as a regular GDAL dataset.
After having created all the VRT for each tile, you can generate a
global VRT file which is the mosaic of all tiles
I've created a section on my page http://even.rouault.free.fr/ with the
source code to generate all the .VRT files for each tile. There's also a
.ZIP with all the VRTs and the global VRT already generated.
Best regards,
Even
Helmut Kudrnovsky a écrit :
hi,
has anyone information if gdal is able to read "ACE - Altimeter Corrected
Elevations"-DEM-data from ESA?
overview ace2-data
http://www.cse.dmu.ac.uk/EAPRS/products_ace_overview.html
3 SECOND DATASET - Data_Format_and_Source_3S
http://tethys.eaprs.cse.dmu.ac.uk/ACE2/docs/Data_Format_and_Source_3S.doc
best regards
Helmut
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