> > buraq wrote: >> I have formatted csv files for every month which is like >> latitude;longitude;turbidityValue. So I want to create >> raster files from these csvs for using in r.sun. > > v.in.ascii -> convert .csv to a vector points file > g.region # set up raster grid > v.surf.rast -> interpolate vector points to raster surface > > > > I have worried about r.sun's Linke Turbidity factor values in areas with > big changes in elevation. Is turbidity value heavily dependent on > altitude?
Linke turbidity is certainly height-dependent given the higher optical path length at lower elevations. A simple approximated pressure correction might be applied if the turbidity at a given altitude z' is known: TL(z)=TL(z')exp(-(z-z')/8435.2) with z and z' given in meters. This could be easily applied using r.mapcalc Jose > > Hamish > > > > > > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user > -- José A. Ruiz-Arias Solar Radiation and Atmosphere Modelling Group http://www.ujaen.es/investiga/tep220 Physics Department, University of Jaén Campus Lagunillas, Building A3 066 23071 Jaén Spain Tlf: +34 953 212 474 Fax: +34 953 212 838 _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
