[GRASS-user] i.albedo

GRASS GRASS user
1

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;
}
2

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@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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3

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@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@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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grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

4

On Fri, Dec 27, 2013 at 5:04 AM, Anna Petrášová <kratochanna@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.

The references are simply missing and should be added.

I have made some fixes:
http://trac.osgeo.org/grass/changeset/58821

The others for i.vi are still lacking.

thanks
Markus