<div dir="ltr">ops! I forgot the list :) <br><br><div><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Veronica Andreo</b> <span dir="ltr"><<a href="mailto:veroandreo@gmail.com">veroandreo@gmail.com</a>></span><br>Date: 2017-10-14 13:50 GMT+02:00<br>Subject: Re: [GRASS-user] <a href="http://i.vi">i.vi</a> (ndvi and sentinel)<br>To: Martin Landa <<a href="mailto:landa.martin@gmail.com">landa.martin@gmail.com</a>><br><br><div dir="ltr"><div><div><div>Hi Martin, <br><br></div>NDVI for Sentinel 2 is estimated as described in the links you provided, i.e. band 8 (NIR) and 4 (RED). It would be possible to use band 8A (narrow IR) but resampling would be needed since B8A has 20m resolution.<br><br></div>HTH,<br></div>Vero<br></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">2017-10-14 12:36 GMT+02:00 Martin Landa <span dir="ltr"><<a href="mailto:landa.martin@gmail.com" target="_blank">landa.martin@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
<a href="http://i.vi" rel="noreferrer" target="_blank">i.vi</a> manual [1] shows how to compute NDVI from Sentinel-2:<br>
<br>
"""<br>
Satellite specific band numbers ([NIR, Red]):<br>
...<br>
  Sentinel-2 Bands = [ 5,  4]<br>
"""<br>
<br>
But [1] speaks about 4th and 8th band. Is it a bug in <a href="http://i.vi" rel="noreferrer" target="_blank">i.vi</a> manual?<br>
Thanks for clarification. Martin<br>
<br>
[1] <a href="https://grass.osgeo.org/grass72/manuals/i.vi.html#vegetation-indices" rel="noreferrer" target="_blank">https://grass.osgeo.org/grass7<wbr>2/manuals/i.vi.html#vegetation<wbr>-indices</a><br>
[2] <a href="https://sentinel.esa.int/web/sentinel/technical-guides/sentinel-2-msi/level-2a/algorithm" rel="noreferrer" target="_blank">https://sentinel.esa.int/web/s<wbr>entinel/technical-guides/senti<wbr>nel-2-msi/level-2a/algorithm</a><br>
<span class="m_8570780715912488691HOEnZb"><font color="#888888"><br>
--<br>
Martin Landa<br>
<a href="http://geo.fsv.cvut.cz/gwiki/Landa" rel="noreferrer" target="_blank">http://geo.fsv.cvut.cz/gwiki/L<wbr>anda</a><br>
<a href="http://gismentors.cz/mentors/landa" rel="noreferrer" target="_blank">http://gismentors.cz/mentors/l<wbr>anda</a><br>
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