Moritz Lennert wrote:
On 17/06/09 14:06, maven apache wrote:
I got a.green a.red a.blue and a.alpha four raster,then follow the
advise from this list I composite the three map g b r to a new
raster:outss
then I run the commond r.stats -a input=ou...@permanent
<mailto:input=ou...@permanent> fs=space nv=* nsteps=255
got the following output
0 429847.542397
9321 212745757.083273
26425 4430667.032198
31744 5444337463.194785
32736 35683640.857434
32767 92624.052023
I wonder what do the first number in each line respent? And the
second number in each respent the area?
RTFM ;-)
The first number is the category number, i.e. the different categories
(in your case colors) present in your map.
The second number gives the area statistics which are given in units
of square meters.
Moritz
________
And if you want to improve the output, then two steps:
First use r.category to give a label to each category like so:
(assuming the first is black)
echo "0:Black" | r.category outss rules=-
(note the '-' which means "read from stdin")
Next use r.report like so:
r.report outss unit=k
(gives a table with the cat value, the label and area in sqkm)
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