[gdal-dev] Combining raw .vrt with derived bands

[Scott Staniewicz]

Is it possible to have a VRTRawRasterBand and a VRTDerivedRasterBand, which
is derived from that Raw file, together as two bands in a single VRT file?


I've got a CFloat32 raster file with only one complex band in binary format
(called "20160327_20160420.int" in the example below), and I've figured out
how to make a VRT for it so I can load it with GDAL.

"20160327_20160420.int.vrt":

<VRTDataset rasterXSize="720" rasterYSize="720">
  <VRTRasterBand dataType="CFloat32" band="1" subClass="VRTRawRasterBand">
    <SourceFilename relativeToVRT="1">20160327_20160420.int</SourceFilename>
    <ImageOffset>8</ImageOffset>
    <PixelOffset>8</PixelOffset>
    <LineOffset>5760</LineOffset>
    <ByteOrder>LSB</ByteOrder>
  </VRTRasterBand>
  <SRS>WGS84</SRS>
  <GeoTransform> ...</GeoTransform>
</VRTDataset>

This works great. I've also figured out how to make a derived raster band
from this that shows the amplitude of the data, and also the phase (below):

"20160327_20160420.int.phase.vrt":

<VRTDataset rasterXSize="720" rasterYSize="720">
  <SRS>...</SRS>
  <GeoTransform>  ...</GeoTransform>
  <VRTRasterBand dataType="Float32" band="1"
subClass="VRTDerivedRasterBand">
    <Description>phase of 20160327_20160420.int.vrt </Description>
    <SimpleSource>
      <SourceFilename
relativeToVRT="1">20160327_20160420.int.vrt</SourceFilename>
      <SourceBand>1</SourceBand>
      <SourceProperties RasterXSize="720" RasterYSize="720"
DataType="CFloat32" BlockXSize="720" BlockYSize="1" />
    </SimpleSource>
    <PixelFunctionType>phase</PixelFunctionType>
    <SourceTransferType>CFloat32</SourceTransferType>
  </VRTRasterBand>
</VRTDataset>

But I can't figure out how I would get both of these as two bands in one
VRT without causing an infinite recursion. Is that possible? Or do I need
to keep them separate?
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