<div>Hello Markus. Thanks for your answers</div><br>> As far as I saw, there are no GRASS functions to perform Radiometric<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="im">
> Correction.<br>There is: i.atcorr.</div></blockquote><div>Regarding i.atcorr I thought that the only thing i.atcorr perfoms is the atmospheric correction, I mean conversion from TOA (top-of-atmosphere) to BOA (Bottom-of-atmosphere). </div>
<div>But how about the correction of illumination variations and instrument calibration? 6S also includes this?</div><div>(by the way, at i.atcorr manual one of the links (INPE) is dead)</div><div>I.atcorr is equal to 6S models provided by Maryland Univ group?</div>
<div><br></div><div>Regarding Geometrical conditions:</div><div>- Is it possible to addapt this to a SPOT image or UK-DMC image? I mean there is a list of pre-defined bands and those satellites, among others, are not there. But it is possible to apply this model to others satellite images?</div>
<div><br></div><div><br></div><div> Yes, please see</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<a href="http://grass.osgeo.org/wiki/Atmospheric_correction" target="_blank">http://grass.osgeo.org/wiki/Atmospheric_correction</a><br>
<font color="#888888"><br></font></blockquote><div>Regarding The estimation the overpass time from the sun position:</div><div>Is this retrieved information useful for the i.atcorr process right ? and is this information placed automatically in <font class="Apple-style-span" face="sans-serif"><span class="Apple-style-span" style="line-height: 19px;">the ICND file?</span></font></div>
<div><font class="Apple-style-span" face="sans-serif"><span class="Apple-style-span" style="line-height: 19px;"><br></span></font></div><div><font class="Apple-style-span" face="sans-serif"><span class="Apple-style-span" style="line-height: 19px;">Thank you for your help Markus</span></font></div>
<div><font class="Apple-style-span" face="sans-serif"><span class="Apple-style-span" style="line-height: 19px;"><br></span></font></div><div><font class="Apple-style-span" face="sans-serif"><span class="Apple-style-span" style="line-height: 19px;">Best regards</span></font></div>
<div><font class="Apple-style-span" face="sans-serif"><span class="Apple-style-span" style="line-height: 19px;">Nikos</span></font></div></div><br>