<div dir="ltr">Thank you for your answer Nikos,<div><div>may it possible to enter manually the "<span style="background-color:rgb(238,238,221);color:rgb(0,0,0);font-family:monospace;font-size:11px"> </span><span style="background-color:rgb(238,238,221);color:rgb(0,0,0);font-family:monospace;font-size:11px">Red of wv2_spectral_response_for_i.atcorr</span><span style="background-color:rgb(238,238,221);color:rgb(0,0,0);font-family:monospace;font-size:11px"> </span>" 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</div><div>cheers,</div></div><div>Fabien</div></div><div class="gmail_extra"><br><div class="gmail_quote">2017-04-12 7:58 GMT-03:00 Nikos Alexandris <span dir="ltr"><<a href="mailto:nik@nikosalexandris.net" target="_blank">nik@nikosalexandris.net</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">* Fabien Wagner <<a href="mailto:wagner.h.fabien@gmail.com" target="_blank">wagner.h.fabien@gmail.com</a>> [2017-04-11 15:21:41 -0300]:<div><div class="h5"><br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Dear Grass users,<br>
<br>
i am running i.atcorr on a worldview2 band (red band) and the resulting map<br>
is empty, values are only NaN.<br>
<br>
the input image is in reflectance, the values are integer between 0-255<br>
<br>
i have set the g.region with the input image<br>
<br>
the parameters are<br>
<br>
16 # indicates that it is<br>
worldview2 image<br>
12 11 15.750 -47.115 -22.822 # image taken on the 11th of December at<br>
15:45 GMT in decimals; the center of the image lies at 47.115 °W and<br>
-22.822°S<br>
1 # the tropical<br>
atmospheric model<br>
1 # the continental<br>
aerosol model<br>
0 # I have an estimate<br>
of aerosol optical depth so 0<br>
0.100 # aerosol optical depth<br>
at 550nm<br>
-.6121813 # the terrain lies 612<br>
meters above sea level [km] * -1<br>
-770 # image taken of a<br>
satellite sensor at 770 km<br>
106 # 106 : red band of the<br>
worldview2 sensor<br>
<br>
I see that the first part is ok, the algorithm compute the estimated<br>
visibility (63.66 km) , but then the atmospheric correction did not run and<br>
produce and empty raster.<br>
<br>
the test with an elevation raster didn't change nothing.<br>
i have try to set by hand the wl inf and sup in the parameter file (wl<br>
inf= 0.350 mic wl sup= 1.100 mic, for the red band ), here the<br>
return by verbose is slighty different, but again i have an empty raster<br>
<br>
does anyone have an idea of what i am missing ?<br>
</blockquote>
<br></div></div>
Dear Fabien,<br>
<br>
this <a href="https://trac.osgeo.org/grass/ticket/2059" rel="noreferrer" target="_blank">https://trac.osgeo.org/grass/t<wbr>icket/2059</a> is still standing, as far<br>
as I can tell.<span class="HOEnZb"><font color="#888888"><br>
<br>
Nikos<br>
</font></span></blockquote></div><br></div>