[gdal-dev] Warp a file from two separate Lat and Long
Luisa Peña
luisapena1979 at gmail.com
Thu Feb 18 13:44:43 EST 2010
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>
> 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
>> ------------------------------------------------------------------------
>>
>>
>> _______________________________________________
>> gdal-dev mailing list
>> gdal-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>>
>
>
>
> --------------------------------------------------------------------------------
> Plymouth Marine Laboratory
>
> Registered Office:
> Prospect Place The Hoe
> Plymouth PL1 3DH
>
> Website: www.pml.ac.uk
> Registered Charity No. 1091222
> PML is a company limited by guarantee
> registered in England & Wales
> company number 4178503
>
> PML is a member of the Plymouth Marine Sciences Partnership
> Website: www.pmsp.org.uk--------------------------------------------------------------------------------
> This e-mail, its content and any file attachments are confidential.
>
> If you have received this e-mail in error please do not copy, disclose it
> to any third party or use the contents or attachments in any way. Please
> notify the sender by replying to this e-mail or e-mail forinfo at pml.ac.ukand then delete the email without making any copies or using it in any other
> way.
>
> The content of this message may contain personal views which are not the
> views of Plymouth Marine Laboratory unless specifically stated.
>
> You are reminded that e-mail communications are not secure and may contain
> viruses. Plymouth Marine Laboratory accepts no liability for any loss or
> damage which may be caused by viruses.
>
> --------------------------------------------------------------------------------
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/gdal-dev/attachments/20100218/875afa05/attachment.html
More information about the gdal-dev
mailing list