[GRASS-dev] Unexpected EVI range from "i.vi"

Markus Neteler neteler at osgeo.org
Mon Jun 10 14:40:58 PDT 2013

Hi Nikos,

if you have a i.landsat.toar corrected scene, please extract the values for

- water pixel
- green vegetation
- asphalt

... all bands except for TIR.

I want then to synthetic channels of one pixel to do
the i.vi testing:

# prepare comp. region
g.region rast=lsat7_2002_10 rows=1 cols=1 -p

# create synthetic channels (for the letters, we need your values)
r.mapcalc "water_b7 = aa"
r.mapcalc "water_b5 = bb"
r.mapcalc "water_b4 = cc"
r.mapcalc "water_b3 = dd"
r.mapcalc "water_b2 = ee"
r.mapcalc "water_b1 = ff"

Likewise for the other "landuses". This allows us to create a tiny test
environment to check the output. I am just lacking a prepared Landsat
scene (and the time to process it). Since you already have it, you may
extract the values easily with r.what or the wxGUI.


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