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<div class="moz-cite-prefix">Hi Lisa:<br>
Recently I made a set of ToA reflectance and radiance and
atmospheric correction, similarly to what you are doing. I chose
for the "range=" parameter values that were a bit above and below
the min/max DN of all of the images. I first checked with r.info
-r for all the bands to get the range of values, and used those to
set the range appropriately.<br>
If you try this, let us know if you are satisfied with the
results.<br>
<br>
Best,<br>
Micha<br>
<br>
On 6/15/2015 11:33 AM, John, Lisa wrote:<br>
</div>
<blockquote
cite="mid:5D21EF546E4A0D4DAF2D6094385BF16B1B713AC3@um-excdag-s4.um.gwdg.de"
type="cite">
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<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB">Hi,</span></p>
<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB"> </span></p>
<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB">I am using i.landsat.toar and i.atcorr –r for a
region in Germany. The problem I face is that the resulting
reflectance values are very low (0.2-0.3 for vegetation in
band 5). I think the values should be higher (around 0.6). </span></p>
<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB">I am using Landsat 8 images from Ocotber and
from August. For both months I get that low values.
</span></p>
<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB">For i.atcorr –r I used an input range of 0,1
and an output range of 0,1. Any idea what I am doing wrong?
</span></p>
<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB">Overall the shapes of the reflectance curves
for vegetation (value vs bands) seem reasonable, I am just
worried about the values which seem to be too low.</span></p>
<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB"> </span></p>
<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB">i.landsat.toar input="LC81960252013275LGN00_B"
output="10_toar_B" me\<span style="mso-spacerun:yes">
</span>|</span></p>
<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB"><span style="mso-spacerun:yes"> </span>|<span
style="mso-spacerun:yes">
</span>tfile="C:\Users\lj\Documents\grassdata\LC81960252013275LGN00_MTL.txt\<span
style="mso-spacerun:yes">
</span>|</span></p>
<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB"><span style="mso-spacerun:yes"> </span>|<span
style="mso-spacerun:yes">
</span>" sensor="oli8" method="uncorrected" percent=0.01
pixel=1000 rayleig\<span style="mso-spacerun:yes">
</span>|</span></p>
<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB"><span style="mso-spacerun:yes"> </span>|<span
style="mso-spacerun:yes">
</span>h=0.0 scale=1.0 <span style="mso-spacerun:yes"> </span></span></p>
<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB"> </span></p>
<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB">i.atcorr -r input="10_toar_B5@l" range=0,1
parameters="C:\Users\lj\D\<span style="mso-spacerun:yes">
</span>|</span></p>
<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB"><span style="mso-spacerun:yes"> </span>|<span
style="mso-spacerun:yes">
</span>ocuments\grassdata\AC\6S
parameters\10_i.atcorr_B5.txt" output="10_a\<span
style="mso-spacerun:yes">
</span>|</span></p>
<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB"><span style="mso-spacerun:yes"> </span>|<span
style="mso-spacerun:yes">
</span>tcorr_B5" rescale=0,1 </span></p>
<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB"> </span></p>
<p class="MsoNormal"><span style="mso-ansi-language:EN-GB"
lang="EN-GB">Regards, Lisa.</span></p>
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