Details Ticket 4156


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Serial Number 4156
Subject Errors in r.walk
Area grass6
Queue grass
Requestors ecerrillo@unex.es
Owner none
Status resolved
Last User Contact Fri Mar 10 12:40:13 2006 (2 yr ago)
Current Priority 30
Final Priority 70
Due No date assigned
Last Action Fri Mar 10 12:40:15 2006 (2 yr ago)
Created Wed Mar 8 22:11:50 2006 (2 yr ago)

Transaction History Ticket 4156


Wed, Mar 8 2006 22:11:50    Request created by guest  
Subject: Errors in r.walk

Platform: GNU/Linux/x86
grass obtained from: CVS
grass binary for platform: Compiled from Sources

I get errors when trying to run r.walk

If I set the starting points (coodinates = x,y) I get the next error:

WARNING: segment_pagein: short count during read()
WARNING: segment_pagein: short count during read()
WARNING: segment_pagein: short count during read()
ERROR: Raster output map out_walk - not found (no start_points given)

I know the pagein bug, but the command demands the use of vector points in order
to do its operations instead of given coordinates. Nevertheless, if I try to
introduce a vector points layer as "start_points", I get another error:

Walking costs are a=0.720000 b=6.000000 c=1.999800 d=-1.999800
Lambda is 2.000000
Slope_factor is -0.212500
Nseg is 4
Null cells excluded from cost evaluation.
ERROR: Can't find starting vector archsites

R.walk does not recognise existing "archsites" vector.

Any sugestions? Thanks
Wed, Mar 8 2006 22:48:43    Mail sent by guest  
Hi,

please post the full command line you used.
Also: does the "archsites" map really exist (in the
mapset search path)?

does
 v.info archsites
work?

Markus
Thu, Mar 9 2006 18:49:41    Mail sent by guest  
Hi,

I think I found some bugs in r.walk. Now it should
find the maps, please try again from CVS (or next Saturday's
snaphot).

Markus
Fri, Mar 10 2006 12:40:13    Mail sent by mneteler  
We have fixed the remaining segfaults.

Now r.walk works.

Spearfish example:
r.walk elevation.dem friction=slope start_points=archsites
stop_points=bugsites out=walk lam=2

Markus
Fri, Mar 10 2006 12:40:15    Status changed to resolved by mneteler  
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