Hi Daniel, it's clear to me that r.sun needs some sort of spatial reference. I thought that is why I can provide latitude and longitude grids as input for the very special case of an XY location. Isn't it like that?
cheers Christian _________________________________________ 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 From: Daniel Lee <[email protected]> To: Christian Braun <[email protected]>, Cc: [email protected] Date: 08/08/2012 17:44 Subject: Re: [GRASS-user] r.sun and XY locations 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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