[gdal-dev] Is there an easy way to clip an image to the realdata?

[Stephen Woodbridge]

Hi,

I'm working with VIIRS L3U images of L2P (level 2 patches). The L3U data 
is gridded to the +-180 x +-90 but the patch only fills a small 
percentage of that. I'm compositing a the patch for a day using a vrt.

Performance is an issue because all the patches cover the whole globe 
instead of the extents of the patch.

Is there a way to automatically clip an image to the extents of the 
patch, where all the rest of the image it filled with nodata? IE. remove 
all rows and columns from the exterior edges that are all nodata and 
stop when you hit real data.

-Steve

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