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Applied-GeoSolutions / gips

Geospatial Image Processing System
GNU General Public License v3.0
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GIPS export feature boundary issue #395

Open bziniti opened 7 years ago

bziniti commented 7 years ago

I noticed the output from multi temporal.py annual stats has missing values at border from 2000-2016.

See picture:

screen shot 2017-09-07 at 10 36 02 am

Maybe a projection change or interaction with gap fill??

bhbraswell commented 7 years ago

This is a head scratcher because the underlying CHIRPS data know nothing about country boundaries and have no gaps. Something about the export is doing something differently starting about 2000 from what it is doing from 1980-2000.

bziniti commented 7 years ago

Also true to the export files. I looked at a stack of 1999001 and 2000001. Here's a plot of the NA count.

screen shot 2017-09-07 at 11 03 30 am
bziniti commented 7 years ago

It also must be because of this same issue that the disturbance module was giving strange results.

Here's a plot of (disturbance duration I think -- band 3):

screen shot 2017-09-08 at 11 05 26 am

The long durations occur along the edge. Maybe these NA were filled with something?

bhbraswell commented 7 years ago

I changed the title of the issue because I think it is potentially applicable to other places than DRC and other data sources than CHIRPS. (We should verify that.)

But the question is why would a GIPS export for some years produce a slightly different boundary for the feature than for other?

bhbraswell commented 7 years ago

I can confirm that this happens with a different export region (different shapefile in a different projection).