Hi Christian, Determining the position of the sun relative to a given pixel requires knowing the pixel's latitude at the very least. That's why using r.sun in an XY location won't work. r.sun definitely needs a geographic location to work with - otherwise it doesn't know which way is north and south and where the sun's at at a given time of day or year.
Best, Daniel -- B.Sc. Daniel Lee Geschäftsführung für Forschung und Entwicklung ISIS - International Solar Information Solutions GbR Vertreten durch: Daniel Lee, Nepomuk Reinhard und Nils Räder Softwarecenter 3 35037 Marburg Festnetz: +49 6421 379 6256 Mobil: +49 176 6127 7269 E-Mail: [email protected] Web: http://www.isi-solutions.org 2012/8/8 Christian Braun <[email protected]> > Dear all, > > I want to create a WPS module which is calculating solar irradiance. As > WPS architecture I have to use PyWPS which is creating a XY-location and > mapsets on the fly to process the data. > > What is the current status of running r.sun in a XY location? On a testing > machine I got back an error message [1] while providing latitude and > longtiude grids to the r.sun command [2]. Is it feasible at all? > > I am aware of the setting in PyWPS to have the GRASS processing done in a > predefined GRASS location, but this is not an option because of how the WPS > should work. > > Greetings from Luxembourg, > Christian > > > > [1] > WARNING: <PROJ_INFO> file not found for location <XY> > ERROR: Can't get projection info of current location > > [2] > r.sun -s elevin=ro_dsm latin=ro_latitude longin=ro_longitude lin=3 > alb=0.17 beam_rad=ro_irra_B_hc diff_rad=ro_irra_D_hc glob_rad=ro_irra_G_hc > day=180 step=1 > > > ------------------------------------------------------------ > Christian Braun > R+D Engineer > Environmental Modelling, Geocomputation > > Tel: +352- 425991-6608 > Mobil: +49-179-6845896 > Mail: [email protected] > > Resource Centre for Environmental Technologies, > Public Research Centre Henri Tudor, > Technoport Schlassgoart, > 66 rue de Luxembourg, > P.O. BOX 144, > L-4002 Esch-sur-Alzette, Luxembourg > > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user >
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