[GRASS-user] rainfall data and a DEM

[Micha Silver]

On 05/28/2010 05:39 PM, Sandile Gumede wrote:
> Hi,
>
> Is there a way of merging rainfall data and SRTM DEM (both in GEOTIFF 
> format ) together?
Can you be more specific? What do you mean "merge".
>
> The reason I'm asking this is because SRTM DEM (elevation layer) is 
> just a terrain, on top of that terrain I want to measure how much 
> rainfall has fallen to the DEM and which direction is it flowing to.
Flow direction can be produced from a DEM with the r.watershed module.
If what you want is a calculation of how much total rainfall fell in 
each *catchment*, then first use the r.watershed module to create 
catchments, then convert the raster catchment map to vector polygons and 
finally run v.rast.stats on the catchment polygons, using the rainfall 
raster to calculate how much rain fell on each catchment.
-- 
Micha

>
>
> -- 
> Kind Regards
> TS Gumede
> Student Researcher
> Meraka Institute, CSIR
> office   :  012 841 2606
> mobile :  072 258 1650
>
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-- 
Micha Silver
Arava Development Co. +972-52-3665918
http://www.surfaces.co.il


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