[GRASS-user] accumulation map from directions map
Achim Kisseler
ak7 at jupiter.uni-freiburg.de
Thu Dec 17 07:42:14 EST 2009
Hi all,
again I reached the point I did half a year ago: jgrass only can handle
'metric' rasters, which means raster-cells of equal sizes, same NS, OW
resolution.
I work an a latlon-projection and therefore I cannot use jgrass.
? 1 I guess, r.stream cannot handle latlong-projections?
? 2 I guess, r.stream doesn't have something like h.tca?
(h.tca: makes an accumulation map from a direction map)
? 3 Is it possible to make the accumulation-values non-integer and
weight every grid-cell with its real area size? Then every accumulation
value would indicate its basin-size and so on like in eg. lambert
projection.
What wouldn't work that easy: distances EW and thus angle based
calculations, too.
Again my old PROBLEM:
How to get an accumulation map strickly WITHOUT an DEM from ONLY an
direction map on a LAT-LON map?
Achim
Jarek Jasiewicz schrieb:
> Markus Neteler pisze:
>> On Thu, Nov 19, 2009 at 2:35 PM, Achim Kisseler
>> <ak7 at jupiter.uni-freiburg.de> wrote:
>>
>>> Dear Markus,
>>>
>>> I follow Silvias suggestion and use h.tca in JGRASS.
>>>
>>> BTW: Isn't is possible to integrate the horton-tools into grass?
>>>
>>
>> If the license is compliant to GPL (I guess so), yes.
>>
> Hortons tools are available in svn add ons as r.stream.* suite:
> r.stream.extract, r.stream.order, r.stream.stats etc... see tutorial on
> grass wiki
> http://grass.osgeo.org/wiki/R.stream.*
> Jarek
>
>> Markus
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>
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