On 20/01/16 18:09, Aldo CLERICI wrote:
Dear GRASS users,
By (Spearfish Location):
v.to.db –p roads option=length
I have this result:
cat|length
5|136313.999118462
4|151211.909391895
3|29073.0640515405
1|47106.9051508698
2|28460.9513530158
I’m not able to realize the sorting criteria. Any hint?
v.db.select roads
cat|label
0|no data
1|interstate
2|primary highway, hard surface
3|secondary highway, hard surface
4|light-duty road, improved surface
5|unimproved road
The spearfish dataset dates from pre-grass6 times when vectors did not
have attribute tables, but only a category value with relevant labels.
So all roads of a certain type had the same cat value which had a
thematic meaning.
Your result thus gives you the total length of road per category.
Moritz
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