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On 27/05/2013 16:41, Marcello Benigno
wrote:
I'm working on the preparation of the statement of
Agricultural Capacity in general terms the final map has
classes ranging 1-8.
To get this map I use three themes with their respective
notes:
- Map of Slope: with classes ranging 1 to 8;
- Soil Map: with classes ranging 1 to 8;
- Map of flood risk: with classes ranging 1 to 8;
I - After converting all to a vector format and "merge" the
three layers, I have multiple polygons with various
combinations, eg:
a) 1,3,1
b) 5,2,1
c) 4,2,1
d) 1,1,8
II - To determine the final value of the class is chosen the
highest value:
a) 3
b) 5
c) 4
d) 8
Not sure I understand the logic of taking the highest value, but you
can do this simply with the original rasters using:
r.series input=slope,soils,floods out=agri_risk method=max
Then convert to vectors only at the end.
I need to automate this task because the last step (II) is
very slow (actually manually), which would be the best way to do
this? I think the whole process can be done with the data in
raster format, but have not found a formula that I can apply in
r.mapcalc to this problem.
Thanks in advance,
--
Marcello Benigno B. de Barros Filho
Prof. do Curso Superior de Tecnologia em
Geoprocessamento - IFPB
Mestre em Ciências Geodésicas e Tecnologias da Geoinformação -
UFPE
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--
Micha Silver
GIS Consulting
052-3665918
http://www.surfaces.co.il
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