[GRASS-user] Topography shading in irradiance

[Maris Nartiss]

Hello Robson,
although I did not completely understood your problem, here are a few
points for a start.
1. Import WRF data in into a new location/mapset with its coordinate
system matching WRF one;
2. Set computational region resolution to 1km (g.region res=1000 -a -p);
3. Run one of r.resamp.* tools (e.g. r.resamp.interp) to obtain smooth
version of WRF in the new resolution set in the step #2.
4. ???
5. Profit!

To fill ???, take a look at r.sun and r.sunmask. You will need a DEM
to calculate the influence of topography.

https://grass.osgeo.org/grass78/manuals/r.resamp.interp.html
https://grass.osgeo.org/grass78/manuals/r.sun.html
https://grass.osgeo.org/grass78/manuals/r.sunmask.html

Don't hesitate to ask follow up questions after taking a look at r.sun
and r.sunmask.
Good luck,
Māris.


2021-08-12 5:04 GMT+03:00, Robson Passos <robsonbarretodospassos at gmail.com>:
> Dear,
>
> I have irradiance data from the WRF meteorological model, the data is with
> 3 km resolution, first I need to refine it to 1 km resolution and then
> calculate the irradiance loss due to the shading of the terrain.
>
> Is there a tool that does this in GRASS? I would like to use an irradiance
> raster as input and know the influence of topography on shading, similar to
> what is presented in the solar potential atlases.
>
> If you can clarify this for me I would appreciate it.
>
> Thank you very much in advance,
> Robson
>