Hi Luisa,
I think you would need to create the VRTs manually - although it would
be a fairly easy task to automate.
Regards,
Andrew
Luisa Peña wrote:
Hi Andrew
But How can I create those VRT, I never used those, from my original
binaries datasets (HDF)? It seems that VRT is the key for my problem.
But I never used it before
Thanks for your help
Luisa
2010/2/18 Andrew Clegg <[email protected] <mailto:[email protected]>>
Hi Luisa,
I've tried something similar in the past with satellite data. I
had 3 files, containing latitude, longitude and value stored as
floats. I had some very minor success with the following solution
(I got out an image but it seemed to drop to a very low
resolution). I'm posting it more in the hope that someone else may
be able to spot what I did wrong, because I would still really
like to be able to do this.
My approach was to create a virtual dataset for each file:
sst.vrt (the values):
<VRTDataset rasterXSize="1296" rasterYSize="2030">
<Metadata domain="GEOLOCATION">
<MDI key="X_DATASET">lon.vrt</MDI>
<MDI key="X_BAND">1</MDI>
<MDI key="Y_DATASET">lat.vrt</MDI>
<MDI key="Y_BAND">1</MDI>
<MDI key="PIXEL_OFFSET">0</MDI>
<MDI key="LINE_OFFSET">0</MDI>
<MDI key="PIXEL_STEP">1</MDI>
<MDI key="LINE_STEP">1</MDI>
</Metadata>
<VRTRasterBand dataType="Float32" band="1"
subClass="VRTRawRasterBand">
<SourceFilename relativetoVRT="1">sst.img</SourceFilename>
<ImageOffset>0</ImageOffset>
<PixelOffset>4</PixelOffset>
<LineOffset>5184</LineOffset>
<ByteOrder>LSB</ByteOrder>
</VRTRasterBand>
</VRTDataset>
lon.vrt (longitude): (latitude is basically the same)
<VRTDataset rasterXSize="1296" rasterYSize="2030">
<VRTRasterBand dataType="Float32" band="1"
subClass="VRTRawRasterBand">
<SourceFilename relativetoVRT="1">lon.img</SourceFilename>
<ImageOffset>0</ImageOffset>
<PixelOffset>4</PixelOffset>
<LineOffset>5184</LineOffset>
<ByteOrder>LSB</ByteOrder>
</VRTRasterBand>
</VRTDataset>
I then tried to run gdalwarp on sst.vrt, trying either '-geoloc'
or '-to METHOD=GEOLOC_ARRAY'.
Regards,
Andrew Clegg
Plymouth Marine Laboratory
Luisa Peña wrote:
Greetings
I've used GDAL a few times but this is the first time that I'm
lost on what I can do with GDAL to solve my problem. I have 3
separate files, one with my data, other with Lattitude and
another with Longitude. They have the same size and, as an
example, it means that Pixel (1,1) of data is located in
latitude retrieved from Pixel (1,1) from latitude and
longitude (pixel (1,1) from longitude). All of them are in
WGS84 but without GCP's points. I need to create a
georreferenced/rectified Geotiff with this data and, to do
that, I need lat and Long. How can I do this?
Thanks
Best regards,
Luisa Peña
S.Paulo, Brazil
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