#2014: r.sun using EPSG:3031 projection gives strange results
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Reporter: pierreroudier | Owner: grass-dev@…
Type: defect | Status: new
Priority: normal | Milestone: 7.0.0
Component: Raster | Version: svn-trunk
Keywords: r.sun | Platform: Linux
Cpu: x86-64 |
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Changes (by hamish):
* keywords: => r.sun
Comment:
Hi,
I saw the post on the mailing list and will have a look at it -- it might
take me a little while to get to it though. You might try to compare with
the version of r.sun in GRASS 6.4.3svn, as in GRASS 7 some map projection
calculations have been moved out of the main loop to allow the
GPU/multiprocessor acceleration to work.
It won't necessarily fix it, but it may be useful to test.
A couple other things to look at: is the sun over or under the horizon
when it happens (there may be no direct sun but still some diffuse
radiation?), and if PROJ.4 is handling the projection properly
(projections not "north up" (which way is north in a polar
stereographic?), non-Greenwich prime meridians etc.)
in general, polar stereographic is known to work, at least with v.proj:
http://grassold.osgeo.org/screenshots/images/day_on_earth_S.png
Hamish
--
Ticket URL: <https://trac.osgeo.org/grass/ticket/2014#comment:1>
GRASS GIS <http://grass.osgeo.org>
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