[GRASS-dev] r.viewshed update && comparing resolutions

[Markus Neteler]

Will,

I was finally trying r.viewshed but got some troubles:

GRASS 6.4.svn (patUTM32):~ > r.viewshed input=pat_dtm_5m
output=viewshed viewpoint_location=663435,5104325
viewpoint converted from lat-lon mode: (355,876)
Options set as:
---input: pat_dtm_5m
---output: viewshed
---viewpoint: (355, 876)
---outputting viewshed in angle mode:
---The output is {NODATA, -1(invisible),angle(visible)}.
---observer elevation above terrain: 0.000000
---max distance: infinity
---consider earth curvature: 0
---max memory = 500 MB
---------------------------------
nodata value set to nan
get_viewshed_memory usage: size AEvent=24B, nevents=3740742,
total=94774752 B (90 MB)
In-memory memory usage is 94774752 B (90 MB), max mem allowed=524288000 B(500MB)
*************
IN_MEMORY MODE
*************
Start sweeping.
total size of eventlist is 89777808 B (85 MB);  size_t is 8 B
max size_t is -1
running the program in-memory mode requires memory beyond the
capability of the platform. Use external mode, or 64-bit platform.


GRASS 6.4.svn (patUTM32):~ > r.viewshed input=pat_dtm_5m
output=viewshed viewpoint_location=663435,5104325 mem=6000
viewpoint converted from lat-lon mode: (355,876)
Options set as:
---input: pat_dtm_5m
---output: viewshed
---viewpoint: (355, 876)
---outputting viewshed in angle mode:
---The output is {NODATA, -1(invisible),angle(visible)}.
---observer elevation above terrain: 0.000000
---max distance: infinity
---consider earth curvature: 0
---max memory = 6000 MB
---------------------------------
nodata value set to nan
get_viewshed_memory usage: size AEvent=24B, nevents=3740742,
total=94774752 B (90 MB)
In-memory memory usage is 94774752 B (90 MB), max mem
allowed=6291456000 B(6000MB)
*************
IN_MEMORY MODE
*************
Start sweeping.
total size of eventlist is 89777808 B (85 MB);  size_t is 8 B
max size_t is -1
running the program in-memory mode requires memory beyond the
capability of the platform. Use external mode, or 64-bit platform.

GRASS 6.4.svn (patUTM32):~ > head -1 /proc/meminfo
MemTotal:      8167044 kB

GRASS 6.4.svn (patUTM32):~ > uname -a
Linux fep.cealp.local 2.6.18-92.1.6.el5 #1 SMP Wed Jun 25 12:38:37 EDT
2008 x86_64 x86_64 x86_64 GNU/Linux

So it is a 64bit box with quite some memory. Why doesn't it run?

thanks
Markus