[gdal-dev] Warp a file from two separate Lat and Long

[Andrew Clegg]

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 <ancl at pml.ac.uk <mailto:ancl at pml.ac.uk>>
>
>     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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>
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