[Openev-discuss] some question of file format

[<no...@ya...>]

Hi!
In openev, if we import a tiff, it will add overview
on the file itself. Can we put overview in another
file? Search on google, i find some document say
overview can put in a ovr file. How can i use this
solution? 

Another question is about vrt file. I think there is
very little document about vrt. I guess SrcRect and
DstRect means clip box. But in the later test, it's
not. It more like a transform matrix. for example, i
hope the vrt file below show only a part of utm, but
in fact, openev show all.

<VRTDataset rasterXSize="512" rasterYSize="512">
  <VRTRasterBand dataType="Byte" band="1">
    <ComplexSource>
      <SourceFilename>e:\utm.tif</SourceFilename>
      <SourceBand>1</SourceBand>
      <SrcRect xOff="0" yOff="128" xSize="128"
ySize="128"/>
      <DstRect xOff="0" yOff="128" xSize="128"
ySize="128"/>
    </ComplexSource>
  </VRTRasterBand>
</VRTDataset>

Hope somebody familiar with those format can solve my
puzzle :)
Thanks!



=====
Remote Scensing Satellite Ground Station
Chinese Academy of Science

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