Matt,
Have you tried create a cascading VRT, where the first VRT composites
all the GTiff files into a single virtual raster and then reference the
composite in another VRT that assigns colortable. I think this should
work nicely.
-Steve W
On 10/3/2019 7:01 PM, matt.wil...@gov.yk.ca wrote:
Hello gdal-dev, it's been a long time! I'm happy to be digging into
raster data building again for a change, but could use some nudges in
the right direction(s).
A few weeks ago Nasa released Landsat-derived Annual Dominant Land
Cover Across ABoVE Core Domain, 1984-2014
<https://daac.ornl.gov/ABOVE/guides/Annual_Landcover_ABoVE.html>.
It’s composed of 175 geotiff images, with each file containing 31
bands which in turn correspond to a single year in the 1984-2014
period. Each band is 8bit unsigned integer with values from 1 to 15
and 255 as nodata. Each integer value corresponds to a class such as
“Evergreen Forest”, “Herbaceous”, “Water” and so on.
I’ve been successful in manually building a VRT file using Category
element for the classes and ColorTable entry for a palette – but only
for a single band.
My question is: how to properly apply this to all bands? Do I need
duplicate category and colortable elements to every single
VRTRasterBand element or is there a smart way to define it once and
then refer to it like a variable? Am I even approaching this the
right way?
It was quite a bit of work to get this far and I’m not looking forward
to doing this 30 more times.
Sample vrt and simplified source is attached.
*Matt Wilkie*
Geomatics Analyst
Environment | Information Management & Technology
T 867-667-8133 | Yukon.ca <http://yukon.ca/>
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