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generate alternate "multispectral composite" exports #80

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jywarren opened this issue Jan 3, 2012 · 2 comments
Closed

generate alternate "multispectral composite" exports #80

jywarren opened this issue Jan 3, 2012 · 2 comments
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exporting multispectral

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@jywarren
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jywarren commented Jan 3, 2012

nrg

Start by selecting your input data:

 gdalbuildvrt composite.vrt visible-geo.tif infrared-geo.tif

Then edit the .vrt to swap bands, eliminating some bands and changing:

 <SourceBand>1</SourceBand>

for the alternate bands. This could be done in Ruby. Then run:

 gdalwarp composite.vrt nrg.tif
@jywarren
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jywarren commented Jan 3, 2012

We should greyscale the infrared data before working with it -- for now i'm just using the red channel from it.

@jywarren
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jywarren commented Jan 4, 2012

simply removing all alpha band XML from the .vrt seems to work, though it leaves a black background around the entire thing.

This post indicates that this can also be achieved by using the gdalbuildvrt flag "-hidenodata". Will try this now.

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