Fri, Aug 19 2005
12:24:08
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Request created by guest
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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.
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Fri, Aug 19 2005
14:08:36
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Comments added by guest
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Was option 'dp' used to change precision?
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Tue, Aug 23 2005
18:09:16
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Status changed to resolved by mneteler
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Tue, Aug 23 2005
18:09:43
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Mail sent by mneteler
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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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