[GRASS-user] i.albedo

[Jiao Wang]

Hi Anna,

Thanks for your help. At first I thought it was from Liang's paper.
However, after comparing the equations/parameters, it seems only the one
for ASTER was adopted from this paper. The others (i.e. LANDSAT, MODIS,
AVHRR ) are from other sources, but not mentioned in the manual.

Could anybody give some help finding the sources please?

Thank you.

Best,
Jiao


On Thu, Dec 26, 2013 at 6:04 PM, Anna Petrášová <kratochanna at gmail.com>wrote:

> Hi,
>
> according to
>
> http://trac.osgeo.org/grass/browser/grass/trunk/imagery/i.albedo/bb_alb_aster.c
>
> it's this one:
> http://terpconnect.umd.edu/~sliang/papers/RSE.N2B.1.pdf
>
> I wonder if there is any reason it's not in the manual page.
>
> Anna
>
>
> On Thu, Dec 26, 2013 at 10:21 PM, Jiao Wang <jiao at hawaii.edu> wrote:
>
>> Hi
>>
>> I was wondering if anybody could help me find the reference paper used in
>> the equation for MODIS albedo (see below), not necessary the full paper,
>> even the title would help.
>>  Thanks in advance.
>>
>> Best,
>> Jiao
>>
>>
>> https://svn.osgeo.org/grass/grass/trunk/imagery/i.albedo/bb_alb_modis.c
>> /*
>>
>>  * Broadband albedo MODIS
>>  */
>> double bb_alb_modis(double redchan, double nirchan, double chan3,
>> 		    double chan4, double chan5, double chan6, double chan7)
>> {
>>     double result;
>>
>>     result =
>> 	(0.22831 * redchan + 0.15982 * nirchan +
>> 	 0.09132 * (chan3 + chan4 + chan5) + 0.10959 * chan6 +
>> 	 0.22831 * chan7);
>>     return result;
>> }
>>
>>
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>>
>
>
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