[GRASS-user] i.atcorr results in all nulls for 3 out of 4 bands

[Markus Neteler]

Hi Gwen,

On Thu, Apr 5, 2018 at 11:36 PM, gwen210 <gjmiller at email.sc.edu> wrote:
> I was able to compile a new satellite sensor (from Planet labs) in the
> i.atcorr module. I've tried several different things but I keep getting all
> nulls for the red, blue, and green bands while getting good values for the
> NIR. I know the region is correct, plus I get values for atmospherically
> correcting the NIR band so I cannot think of anything else that may be
> wrong! I've attached the file I generated with the create_iwave script. I
> also followed the how to guide within the i.atcorr module, and tried this on
> grass 7.5 and 7.4

I've taken your (offlist) CSV files and made a plot (attached).

To me the curves look too much correlated in order to produce anything
reasonable with i.atcorr (6S).
Have these filter functions been officially published anywhere?

Best
Markus


-- 
Markus Neteler, PhD
http://www.mundialis.de - free data with free software
http://grass.osgeo.org
http://courses.neteler.org/blog
-------------- next part --------------
A non-text attachment was scrubbed...
Name: planet_RGB_NIR_curves.png
Type: image/png
Size: 78597 bytes
Desc: not available
URL: <http://lists.osgeo.org/pipermail/grass-user/attachments/20180417/97e8a714/attachment-0001.png>