Details Ticket 3546


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Serial Number 3546
Subject i/o error in r.out.arc, accuracy too low
Area grass6
Queue grass
Requestors b61bro@b61srv5.bauv.unibw-muenchen.de
Owner none
Status resolved
Last User Contact Tue Aug 23 18:09:43 2005 (3 yr ago)
Current Priority 30
Final Priority 70
Due No date assigned
Last Action Tue Aug 23 18:09:43 2005 (3 yr ago)
Created Fri Aug 19 12:24:08 2005 (3 yr ago)

Transaction History Ticket 3546


Fri, Aug 19 2005 12:24:08    Request created by guest  
Subject: i/o error in r.out.arc, accuracy too low

Platform: GNU/Linux/i386
grass obtained from: CVS
grass binary for platform: Compiled from Sources
GRASS Version: 6.1 cvs 2005

Karl Broich

The accuracy of outputformat in r.out.arc is inconsistant with GRASS internal
format.

GRASS uses internally an accuracy of 8 numbers. r.out.arc writes out only 6 numbers.
After export and reimport with r.in.arc into GRASS this is felt as an mismatch
of several cells at the east boundary. This error possibly occurs just on huge
grids with n x n >> 1000 x 1000. 

Example :

Original North/West corner :
n =28.64083333
w =37.45333333
res=0.00083333

After export with r.out.arc :
n =28.640833
w =37.453333
res=0.000833


Increasing the accuracy for r.out.arc output should be no problem.
Fri, Aug 19 2005 14:08:36    Comments added by guest  
Was option 'dp' used to change precision?
Tue, Aug 23 2005 18:09:16    Status changed to resolved by mneteler  
Tue, Aug 23 2005 18:09:43    Mail sent by mneteler  
I have changed r.out.arc to 8 digits:

r.out.arc help
...
      dp   Number of decimal places
           default: 8

Markus
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