[GRASS-user] measure distance

[Achim Kisseler]

Hi,

I did it the long-way. Here you are (here I am):
-defining, whats the "next" polygon
-updating table with coordinates of centroids
-and the centroids of the next
-writing these informations and cats number out
-building standard-ascii-lines-import file with a bit of awk
-import that
-building table (with stored category-numbers)
-adding column "length"
-v.to.db option=length
-update original table

Achim

Achim Kisseler schrieb:
> Hi grass-users,
> 
> I am going to measure the distance from one centroid to another for many
> polygons in a layer in order to update the table with the distance.
> 
> What would be a way? The only I can imagine so far is:
> - collecting coordinates
> - building lines from them
> - update length of lines
> - update old table
> 
> Is there another, better and faster way? Shouldn't be measuring of
> distances a common tool? Do I just don't find it? Do I understand
> v.distance wrong (it just returns the cat of the nearest feature)?
> 
> Achim
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