[R-sig-Geo] problem with RSAGA grid_gridding module

[ajblist-geo at yahoo.de]

Dear Murray,

this seems to be a known bug in SAGA GIS, not in the RSAGA front-end:

http://www.saga-gis.uni-goettingen.de/html/index.php?module=pnForum&func=viewtopic&topic=346

Volker Wiechmann, one of the SAGA developers posted this in response to a user's note:

"I am able to reproduce your error (the shapes in your zip are somewhat
corrupted, but the batch file is ok). The problem arises as soon as you
use a grid system or a grid as final extent/resolution destination. I
had a quick look at the source but could not find something
"suspicious". And I don't have the time to look in detail ... so please
file a bug report on sourceforge.
The module runs fine when you use a user specified extent/resolution.
So maybe this is a workaround for you until the bug is fixed."

The situation described above (grid used as target extent) seems to fit your problem description, so specify a fixed extent and resolution instead as a workaround.

I hope this will help.

Cheers
 Alex





----- Ursprüngliche Mail ----
Von: Murray Richardson <murray.richardson at utoronto.ca>
An: r-sig-geo at stat.math.ethz.ch
Gesendet: Freitag, den 15. August 2008, 20:39:39 Uhr
Betreff: [R-sig-Geo] problem with RSAGA grid_gridding module

Hello,

I am having a problem using the grid to shapes module, as follows:

rsaga.geoprocessor("grid_gridding", 3, list(GRID="tmpPolyGrid.sgrd", 
INPUT="tmp", FIELD=1, TARGET_TYPE=2, GRID_GRID="filled.sgrd"))

This causes saga_cmd to crash on windows xp.  I can't, for the life of 
me, figure out what's going on.  I need the output extents to match the 
extents of "filled.sgrd".  RSAGA works great for everything else I have 
tried, but not this.

Any advice?

Thanks

Murray

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-- 
Alexander Brenning (brenning -at- uwaterloo.ca)
Department of Geography and Environmental Management
University of Waterloo
200 University Ave. W - Waterloo, ON - Canada N2L 3G1
http://www.fes.uwaterloo.ca/geography/faculty/brenning/

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