[GRASS-dev] [GRASS GIS] #3931: i.topo.corr: handle integer input for correction

GRASS GRASS developer
1

#3931: i.topo.corr: handle integer input for correction
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Reporter: sbl | Owner: grass-dev@…
     Type: enhancement | Status: new
Priority: normal | Milestone:
Component: Imagery | Version: svn-trunk
Keywords: i.topo.corr | CPU: All
Platform: All |
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i.topo.corr currently seems to only correct input maps of type DCELL or
FCELL.

It would be great if it could handle also integer maps as input. Maybe a
quantization option, like in i.atcor would be a possibility to scale input
from 1 - 10000 to 0.0 - 1.0 by applying the quantization factor (default
to 1)?

I am thinking of e.g. linked (r.external) Sentinel-2 data here, which
comes with integer values...

Ideally, also output should be saved as integer if input is integer,
reapplying the quantization.

That could save a processing step and would possibly allow to save some
storage space.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/3931&gt;
GRASS GIS <https://grass.osgeo.org>

2

#3931: i.topo.corr: handle integer input for correction
--------------------------+-------------------------
  Reporter: sbl | Owner: grass-dev@…
      Type: enhancement | Status: new
  Priority: normal | Milestone:
Component: Imagery | Version: svn-trunk
Resolution: | Keywords: i.topo.corr
       CPU: All | Platform: All
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Comment (by sbl):

Little correction, FCELL input is not allowed either, though i.atcorr
outputs FCELL.

So, an additional step with r.mapcalc is required to change i.atcorr
output to DCELL (without gain in precision)...

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Ticket URL: <https://trac.osgeo.org/grass/ticket/3931#comment:1&gt;
GRASS GIS <https://grass.osgeo.org>