<div dir="ltr">Hi,<br><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jun 4, 2015 at 2:19 PM, Moritz Lennert <span dir="ltr"><<a href="mailto:mlennert@club.worldonline.be" target="_blank">mlennert@club.worldonline.be</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class=""><div class="h5">On 04/06/15 13:47, Nikos Alexandris wrote:<br>
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* Moritz Lennert <<a href="mailto:mlennert@club.worldonline.be" target="_blank">mlennert@club.worldonline.be</a>> [2015-06-04 11:38:04 +0200]:<br>
<br>
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On 03/06/15 15:06, Markus Neteler wrote:<br>
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On Wed, Jun 3, 2015 at 6:56 AM, Kamhul Camhol <<a href="mailto:monk_purple@yahoo.com" target="_blank">monk_purple@yahoo.com</a>> wrote:<br>
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Hello. I'm quite new with GRASS but I need to atmospherically process<br>
high-resolution imagery with i.atcorr. I have three images Quickbird,<br>
GeoEye-1 and Worldview-3 imagery of a single scene across three time<br>
periods. For Quickbird, I have all the data needed but basing from the<br>
following manual GRASS GIS manual: i.atcorr<br>
there appears to be no values for two required inputs for GeoEye-1 and<br>
Worldview-3.<br>
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<br>
Yes, at time only Quickbird but not GeoEye-1 and Worldview-3 are supported.<br>
<br>
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These are geometrical conditions and band. May I know if GRASS<br>
has updated the i.atcorr manual to include these sensors as well? Can I use<br>
the values of Worldview-2 for Worldview-3? Or is there any other way to do<br>
the atmospheric correction for these two sensors?<br>
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We would be happy to add support for these sensors. We need the<br>
spectral filter curves for that, in order to integrate them in<br>
i.atcorr.<br>
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<br>
Do I understand correctly that you would need the numbers behind the<br>
curves in this document:<br>
<br>
<a href="https://www.digitalglobe.com/sites/default/files/DigitalGlobe_Spectral_Response_1.pdf" target="_blank">https://www.digitalglobe.com/sites/default/files/DigitalGlobe_Spectral_Response_1.pdf</a><br>
<br>
?<br>
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Yes Moritz, that is very relevant! They updated the document I think (it wasn't<br>
there on Summer 2013 plus a few months later -- the properties of this<br>
file indicate October 2014).<br>
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I don't have the time to do this now, but using something like [1], it should be easy to quickly get an approximate dataset from the graphs in that document.<br>
<br>
Moritz<br>
<br>
[1] <a href="http://arohatgi.info/WebPlotDigitizer/" target="_blank">http://arohatgi.info/WebPlotDigitizer/</a></blockquote><div><br></div><div>For GeoEye-1 the curves are here: <br><a href="https://apollomapping.com/wp-content/user_uploads/2013/08/GeoEye-1_Relative_Spectral_Response.xls">https://apollomapping.com/wp-content/user_uploads/2013/08/GeoEye-1_Relative_Spectral_Response.xls</a><br></div><div>see <a href="https://apollomapping.com/about-us/whitepapers">https://apollomapping.com/about-us/whitepapers</a><br></div><div><br></div></div><br clear="all"><br>-- <br><div class="gmail_signature"><div dir="ltr"><div><font color="#666666">Best regards,</font></div><div><font color="#666666"><br></font></div><div><font color="#666666">Dr. Margherita DI LEO </font></div><div><span style="color:rgb(102,102,102);font-family:arial;font-size:small">Scientific / technical project officer</span><br></div><div><font color="#666666"><br></font></div><div><font color="#666666">European Commission - DG JRC </font></div><div><font color="#666666">Institute for Environment and Sustainability (IES)</font></div><div><font color="#666666">Via Fermi, 2749</font></div><div><font color="#666666">I-21027 Ispra (VA) - Italy - TP 261</font></div><div><font color="#666666"> </font></div><div><font color="#666666">Tel. +39 0332 78 3600 </font></div><div><font color="#666666"><a href="mailto:margherita.di-leo@jrc.ec.europa.eu" target="_blank">margherita.di-leo@jrc.ec.europa.eu</a></font></div><div><font color="#666666"><br></font></div><div><font color="#666666">Disclaimer: The views expressed are purely those of the writer and may not in any circumstance be regarded as stating an official position of the European Commission.</font></div></div></div>
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