hello
I want to query my raster map on the basis of its labels using regular expression.
something like:
r.mapcalc map="if(labels~'xxx',1,0)"
is it poosible ?
regards
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Ahmet Temiz
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hi,
if( @map, 1,0)
should work
jachym
On Tue, Jan 09, 2007 at 01:44:51PM -0500, temiz wrote:
hello
I want to query my raster map on the basis of its labels using regular
expression.
something like:
r.mapcalc map="if(labels~'xxx',1,0)"is it poosible ?
regards
--
Ahmet Temiz--
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Jachym Cepicky wrote:
hi,
if( @map, 1,0)
should work
jachym
On Tue, Jan 09, 2007 at 01:44:51PM -0500, temiz wrote:
hello
I want to query my raster map on the basis of its labels using regular expression.
something like:
r.mapcalc map="if(labels~'xxx',1,0)"is it poosible ?
regards
--
Ahmet Temiz--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean._______________________________________________
grassuser mailing list
grassuser@grass.itc.it
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thank you
But I think I need to give you more detail
my raster map is actually a geological map and includes so many rock type categories ( over 100).
something like this: (of course they are not separete fields)
~~~~~~~~
97 Tkisd claystone-siltstone-sandstone (rock type ) eocene
~~~~~~~
if I want to query my raster map on its rock type. Say, to display rock group containing claystone. what should I do ?
I can do it on vector map using sql.
But I have to stay in raster side. Because I analyse the areas containing claystone and its slope angle higher than 20 deg
(another raster map).
shortly I need a command like this:
r.mapcalc result="if((@map ~ 'claystone' && slp> 30),1,0)) # regular expression on a text and this claystone exists
in many rock group. So using cat numbers is not practical.
I think r.mapcalc makes query on numerical values.
so what might be solution be ?
regards
--
Ahmet Temiz
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