<br>Hi Andrew<div><br></div><div>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</div><div><br></div><div>
Thanks for your help</div><div><br></div><div>Luisa<br><div class="gmail_quote">2010/2/18 Andrew Clegg <span dir="ltr"><<a href="mailto:ancl@pml.ac.uk">ancl@pml.ac.uk</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hi Luisa,<br>
<br>
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.<br>
<br>
My approach was to create a virtual dataset for each file:<br>
<br>
sst.vrt (the values):<br>
<br>
<VRTDataset rasterXSize="1296" rasterYSize="2030"><br>
<Metadata domain="GEOLOCATION"><br>
<MDI key="X_DATASET">lon.vrt</MDI><br>
<MDI key="X_BAND">1</MDI><br>
<MDI key="Y_DATASET">lat.vrt</MDI><br>
<MDI key="Y_BAND">1</MDI><br>
<MDI key="PIXEL_OFFSET">0</MDI><br>
<MDI key="LINE_OFFSET">0</MDI><br>
<MDI key="PIXEL_STEP">1</MDI><br>
<MDI key="LINE_STEP">1</MDI><br>
</Metadata><br>
<VRTRasterBand dataType="Float32" band="1" subClass="VRTRawRasterBand"><br>
<SourceFilename relativetoVRT="1">sst.img</SourceFilename><br>
<ImageOffset>0</ImageOffset><br>
<PixelOffset>4</PixelOffset><br>
<LineOffset>5184</LineOffset><br>
<ByteOrder>LSB</ByteOrder><br>
</VRTRasterBand><br>
</VRTDataset><br>
<br>
lon.vrt (longitude): (latitude is basically the same)<br>
<br>
<VRTDataset rasterXSize="1296" rasterYSize="2030"><br>
<VRTRasterBand dataType="Float32" band="1" subClass="VRTRawRasterBand"><br>
<SourceFilename relativetoVRT="1">lon.img</SourceFilename><br>
<ImageOffset>0</ImageOffset><br>
<PixelOffset>4</PixelOffset><br>
<LineOffset>5184</LineOffset><br>
<ByteOrder>LSB</ByteOrder><br>
</VRTRasterBand><br>
</VRTDataset><br>
<br>
I then tried to run gdalwarp on sst.vrt, trying either '-geoloc' or '-to METHOD=GEOLOC_ARRAY'.<br>
<br>
Regards,<br>
<br>
Andrew Clegg<br>
Plymouth Marine Laboratory<br>
<br>
Luisa Peņa wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div></div><div class="h5">
Greetings <br>
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?<br>
<br>
Thanks<br>
<br>
Best regards,<br>
Luisa Peņa<br>
S.Paulo, Brazil<br></div></div>
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