[Gvsig_english] Fwd: raster buffer

[Dietrich Schroeder]

Dear Andre,

 

some time ago, I’ve had to solve a similar problem.

According to my research, such a tool doesn’t exist in Sextante.

 

I used the following workaround:

-          start from the line vector data

-          use lines to equidistant points (with distance approximately according to your raster cell resolution)

-          use Euclidean Distance, which will create a raster with the shortest distances to the points, i.e. or original lines.

At least, this approach did work for my rather small dataset.

 

Regards

 

Dietrich

 

Von: gvsig_internacional-bounces at listserv.gva.es [mailto:gvsig_internacional-bounces at listserv.gva.es] Im Auftrag von Andre Pais
Gesendet: Dienstag, 2. Oktober 2012 16:27
An: gvsig_internacional at listserv.gva.es
Betreff: [Gvsig_english] Fwd: raster buffer

 

 

---------- Forwarded message ----------
From: Andre Pais <[hidden email]>
Date: 2012/9/29
Subject: [Gvsig_english] raster buffer
To: [hidden email]


Hi there,

So I need to generate a raster theme that represents the distance to the
road network of a certain area. I started with the shapefile that represents
the road network, then I converted it to raster using "rasterize vector
layer". Now, I need to use a function that makes buffers to the road network
similar to "Euclidean Distance" of Arcmap. I´ve tried "raster buffer" of
Sextante but it doesn´t return what I need. For example, in the function´s
options I defined my input (the road network raster) and the buffer distance
as 100 (my cell size). The output varies from 0 to 2 and I cannot understand
what it represents nor its appearance looks minimally similar with what I´ve
done with Arcmap.

I would bery much appreciate an answer

Regards, André Pais.



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