<font size=2 face="sans-serif">Hi Daniel,</font>
<br><font size=2 face="sans-serif">it's clear to me that r.sun needs some
sort of spatial reference.</font>
<br><font size=2 face="sans-serif">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?</font>
<br>
<br><font size=2 face="sans-serif">cheers</font>
<br><font size=2 face="sans-serif">Christian</font>
<br><font size=2 face="sans-serif">_________________________________________<br>
<br>
Christian Braun,<br>
R+D Engineer<br>
Environmental Modelling, Geocomputation<br>
<br>
Tel: +352- 425991-6608<br>
Mobil: +49-179-6845896<br>
Mail: christian.braun@tudor.lu<br>
<br>
Resource Centre for Environmental Technologies,<br>
Public Research Centre Henri Tudor,<br>
Technoport Schlassgoart,<br>
66 rue de Luxembourg,<br>
P.O. BOX 144,<br>
L-4002 Esch-sur-Alzette, Luxembourg</font>
<br>
<br>
<br>
<br><font size=1 color=#5f5f5f face="sans-serif">From:
</font><font size=1 face="sans-serif">Daniel Lee <lee@isi-solutions.org></font>
<br><font size=1 color=#5f5f5f face="sans-serif">To:
</font><font size=1 face="sans-serif">Christian Braun <Christian.Braun@tudor.lu>,
</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Cc:
</font><font size=1 face="sans-serif">grass-user@lists.osgeo.org</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Date:
</font><font size=1 face="sans-serif">08/08/2012 17:44</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Subject:
</font><font size=1 face="sans-serif">Re: [GRASS-user]
r.sun and XY locations</font>
<br>
<hr noshade>
<br>
<br>
<br><font size=3>Hi Christian,<br>
<br>
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.<br>
<br>
Best,<br>
Daniel</font>
<p><font size=3>--</font>
<p><font size=3>B.Sc. Daniel Lee<br>
Geschäftsführung für Forschung und Entwicklung<br>
ISIS - International Solar Information Solutions GbR<br>
Vertreten durch: Daniel Lee, Nepomuk Reinhard und Nils Räder</font>
<p><font size=3>Softwarecenter 3<br>
35037 Marburg<br>
Festnetz: +49 6421 379 6256<br>
Mobil: +49 176 6127 7269<br>
E-Mail: </font><a href="mailto:Lee@isi-solutions.org" target=_blank><font size=3 color=#0060a0><u>Lee@isi-solutions.org</u></font></a><font size=3><br>
Web: </font><a href="http://www.isi-solutions.org/" target=_blank><font size=3 color=#0060a0><u>http://www.isi-solutions.org</u></font></a>
<p><font size=3><br>
<br>
</font>
<br><font size=3>2012/8/8 Christian Braun <</font><a href=mailto:Christian.Braun@tudor.lu target=_blank><font size=3 color=blue><u>Christian.Braun@tudor.lu</u></font></a><font size=3>></font>
<br><font size=3>Dear all,<br>
<br>
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.<br>
<br>
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?<br>
<br>
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.<br>
<br>
Greetings from Luxembourg,<br>
Christian<br>
<br>
<br>
<br>
[1]<br>
WARNING: <PROJ_INFO> file not found for location <XY><br>
ERROR: Can't get projection info of current location<br>
<br>
[2]<br>
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<br>
<br>
<br>
------------------------------------------------------------<br>
Christian Braun<br>
R+D Engineer<br>
Environmental Modelling, Geocomputation<br>
<br>
Tel: </font><a href="tel:%2B352-%20425991-6608"><font size=3 color=blue><u>+352-
425991-6608</u></font></a><font size=3><br>
Mobil: </font><a href="tel:%2B49-179-6845896"><font size=3 color=blue><u>+49-179-6845896</u></font></a><font size=3><br>
Mail: </font><a href=mailto:christian.braun@tudor.lu><font size=3 color=blue><u>christian.braun@tudor.lu</u></font></a><font size=3><br>
<br>
Resource Centre for Environmental Technologies,<br>
Public Research Centre Henri Tudor,<br>
Technoport Schlassgoart,<br>
66 rue de Luxembourg,<br>
P.O. BOX 144,<br>
L-4002 Esch-sur-Alzette, Luxembourg<br>
<br>
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