[GRASS-user] r.mapcalc concatenates values?

[Gabriele N.]

Ciao Christian, Ciao Miltinho

I tried r.cross and is useful. The problem however is that you may need to
concatenate values other than categories (eg .. values with letters A, B, C.
..). In addition, I am working with a script in BASH within a cycle and maps
(equal to counter '$ i') are always more than 10.
I do not know how to put all the maps in input to r.cross and insert maximum
10

while [  $i -le $num  ] 
	do   
r.cross  input=map$i,map$i+1$i,map$i+2....... output=map_tot

Maybe there will be a more simple (?)
Thank you


Miltinho Astronauta wrote:
> 
> Hi Gabriele,
> After you use r.cross (I follow Christian´s suggestion on it), if you need
> to do some computation with the new generated raster map, you can use
> r.stats to generate a ascii output. After I even use R to haldle the
> tabular
> data.
> 
> Cheers,
> 
> miltinho astronauta
> brazil
> 
> 2008/9/9 Christian Schwartze <Christian.Schwartze a uni-jena.de>
> 
>> If I unterstood you right, maybe r.cross is useful...
>>
>> Regards,
>> Christian.
>>
>>
>> Zitat von "Gabriele N." <gis.gn a libero.it>:
>>
>> >
>> > Hi everyone.
>> >
>> > I have two questions
>> >
>> > 1)
>> > I have some raster (with the same format and are converted from
>> vector).
>> The
>> > cells have the value of CAT. So the value = CAT
>> > With r.mapcalc I would define a map of output that I give, as the value
>> for
>> > each cell, indications of the different CAT. For example, if I have the
>> > raster A that has value = 1 and raster B that has value = 2, I will
>> have
>> > raster C output value = 1,2
>> > If I have 3 maps in input, value = 1,2,3 etc. ...
>> > I made several attempts but I do not know if r.mapcalc concatenates the
>> > values.
>> >
>> > 2)
>> > if r.mapcalc is not possible, I tried to make the transition to vector.
>> The
>> > passages that I made are:
>> >   - r.to.vect maps raster input (es rasterA and rasterB)
>> >   - V.overlay and I get in dbf, in a column the value of rasterA and in
>> > another column the value of rasterB. I've created a third column to
>> > concatenate the 2 columns but it seems to me that the operator '| |'
>> does
>> > not work with dbf.
>> > How do I concatenate the values in 2 columns?
>> >
>> > Thank you very much
>> > Gabriele
>> > --
>> > View this message in context:
>> >
>> http://www.nabble.com/r.mapcalc-concatenates-values--tp19392795p19392795.html
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>> >
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>>
>>
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