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Multispectral imagery #79

@sethfitz

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@sethfitz

Imagery from EVR2EST comes as 5-band JP2000s and MrSIDs (R, G, B, NIR?; in which order?). GDAL doesn't see ColorInterp attributes on the JP2000s (except for the alpha band: 5).

The simplest (from marblecutter's perspective) approach is to feed it a VRT that maps appropriate bands (or maybe metadata in the catalog).

For this to work, however, the imagery needs to be transcoded correctly; it currently picks the first 3 bands and encodes them with YCbCr JPEG compression, which loses avaialble data.

#72 is related, as those will also be 4-5 band images.

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