<div dir="ltr"><div><div>Something is fishy here, reflectance values should always be within 0-1 range.<br><br></div>Please manually remove all values outside of that range (use r.mapcalc) and make a histogram of your TOAR band. if the histogram is of expected shape, and is not truncated at 1.0 threshold then you are OK. if there is a problem here, that means the TOAR processing had an issue. Stretching output from an unknown histogram skewness could be giving you funny results.<br><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Mon, Jun 15, 2015 at 6:47 PM Micha Silver <<a href="mailto:micha@arava.co.il">micha@arava.co.il</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="direction:ltr" bgcolor="#FFFFFF" text="#000000">
<div>On 6/15/2015 3:25 PM, John, Lisa wrote:<br>
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<div style="direction:ltr;font-family:Tahoma;color:#000000;font-size:10pt">Hi Micha,<br>
<br>
did you refer to the input range? <br>
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Yes, the input range.</div><div style="direction:ltr" bgcolor="#FFFFFF" text="#000000"><br>
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I did so and checked bands 1-9 with <a href="http://r.info" target="_blank">r.info</a> -r. Top of atmosphere
reflectance values are all in the range of -0.01 - 2.12. The
negative value seems to be a outlier and I check in addition
with the range 0-2.12.<br>
I used these values for the input range in i.atcorr -r and used
0,1 as output range.<br>
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I meant in the first i.landsat.toar step. The input (DN) values
should be up to 700 or so. Landsat 8, with its 12 bit data can have
max DN values of 4096. But I didn't use that full range, rather the
actual DN range of the original images.<br>
<br>
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However I get even smaller reflectance values (0.15 respectively
0.29 for vegetation in band5)<br>
<br>
Regards, Lisa.</div>
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