[GRASS-user] Estimating Albedo from Landsat

[stephen sefick]

I have to go out in the field tomorrow, but I have put together a
script, semi-automatically, to do this and calculate NDVI.  I can pass
it along for what it is worth.

On Sun, Sep 12, 2010 at 7:35 PM, Nikos Alexandris
<nikos.alexandris at felis.uni-freiburg.de> wrote:
> Daniel Victoria:
>
>> I haven't tryed i.landsat.toar addon but from what I read in the wiki
>> (http://grass.osgeo.org/wiki/Atmospheric_correction) I could either
>> use i.landsat.toar or a DN - Radiance conversion formula that is
>> given...
>
>> Will try to recalculate the images, I might have done something wrong
>
> Hi Daniel!
>
> Did you finally used i.landsat.toar for the Landsat5 - TM bands?
>
> I am trying to use the module on the LT51830332007248MOR00 image(s) and have
> several (expected) problems, like:
>
> (note that the metadata file I downloaded via GLOVis has a ".meta" extension)
>
> 1. the "LT51830332007248MOR00.meta" isn't read correctly or the module is
> looking for a string other than the "date_acquired = 20070905" string which is
> the only "date-string" included in the ".meta" file
>
> 2. does not recognize the solar elevation value
>
> (the above "cases" are mentioned in the manual, so manual feed is required
> here)
>
> 3. after manually providing the "solar_elevation" and the "product_date" and
> using the "-v" flag, some random (?) segfaults occur.
>
> 4. without the "-v" flag it runs but seems to take too much time? OK, the
> image set is large ( 7654 cols x 7127 rows x 7 bands). --- Is it really taking
> so long or is there something wrong?
>
> Nikos
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-- 
Stephen Sefick
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