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Applied-GeoSolutions / gips

Geospatial Image Processing System
GNU General Public License v3.0
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CDL NoData value is a valid value? #488

Closed bhbraswell closed 6 years ago

bhbraswell commented 6 years ago

I think that CDL NoData value (zero) is a valid value. So that when an export is done, masked pixels are confused with no-crop pixels. Unless I'm missing something.

ircwaves commented 6 years ago

The DBF delivered with CDL data states:

Value      : 0
Class name : Background
Red        : 0.00000000000
Green      : 0.00000000000
Blue       : 0.00000000000
Opacity    : 0.00000000000

Seems they've opted for setting the opacity to 0 (instead of 1) to indicate NoData.

The CDL classes include many non-crop classes, and zero used to be set as the no-data value (see #38). They have stopped setting that metadata item, however, I believe "Background" means unclassified, not "no crop". Also could have misunderstood something here, but I believe we've hashed this one out.

bhbraswell commented 6 years ago

got it. THANKS