[GRASS-user] i.atcorr with wordview2 image return Nan values

[Fabien Wagner]

Thank you for your answer Nikos,
may it possible to enter manually the " Red of
wv2_spectral_response_for_i.atcorr " in the list of parameters ? For
example in the parameter files, as specified in the manual, set the Sensor
band to 1 and Enter wlinf, wlsup and user's filter function s(lambda) by
step of 0.0025 micrometer. what do you think ? i will try today and see if
it works
cheers,
Fabien

2017-04-12 7:58 GMT-03:00 Nikos Alexandris <nik at nikosalexandris.net>:

> * Fabien Wagner <wagner.h.fabien at gmail.com> [2017-04-11 15:21:41 -0300]:
>
>
> Dear Grass users,
>>
>> i am running i.atcorr on a worldview2 band (red band) and the resulting
>> map
>> is empty, values are only NaN.
>>
>> the input image is in reflectance, the values are integer between 0-255
>>
>> i have set the g.region with the input image
>>
>> the parameters are
>>
>> 16                                                  # indicates that it is
>> worldview2  image
>> 12 11 15.750 -47.115 -22.822       # image taken on the 11th of December
>> at
>> 15:45 GMT in decimals; the center of the image lies at 47.115 °W  and
>> -22.822°S
>> 1                                                    # the tropical
>> atmospheric model
>> 1                                                    # the continental
>> aerosol model
>> 0                                                    # I have an estimate
>> of aerosol optical depth so 0
>> 0.100                                             # aerosol optical depth
>> at 550nm
>> -.6121813                                      # the terrain lies 612
>> meters above sea level [km] * -1
>> -770                                              # image taken of a
>> satellite sensor at 770 km
>> 106                                                 # 106 : red band of
>> the
>> worldview2 sensor
>>
>> I see that the first part is ok,  the algorithm compute the estimated
>> visibility (63.66 km) , but then the atmospheric correction did not run
>> and
>> produce and empty raster.
>>
>> the test with an elevation raster didn't change nothing.
>> i have try to set by hand the wl inf and sup in the parameter file (wl
>> inf=    0.350 mic   wl sup=    1.100 mic,  for the red band ), here the
>> return by verbose is slighty different, but again i have an empty raster
>>
>> does anyone have an idea of what i am missing ?
>>
>
> Dear Fabien,
>
> this https://trac.osgeo.org/grass/ticket/2059 is still standing, as far
> as I can tell.
>
> Nikos
>
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