[GRASS-user] Topography shading in irradiance

[Robson Passos]

Dear, thank you very much for the reply.

The r.sun tool considers the terrain shading, that's exactly what I need,
but it only uses DEM and some solar parameters as input. The irradiance is
calculated by an internal model, in this case it is the potential
irradiance. What I need is to use DEM and my own irradiance raster as
input. Would it be possible to use r.sun in this way?

Thank you very much,
Robson.

Em qui., 12 de ago. de 2021 às 04:01, Maris Nartiss <maris.gis at gmail.com>
escreveu:

> 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
> >
>
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