hello
I want to calculate distance between two end points of a line
I used:
select cat,
distance(pointn(wkb_geometry,1),pointn(wkb_geometry,npoints(wkb_geometry)))
from spelhey;
it gives all zero
cat | distance
-----+----------
1 | 0
2 | 0
3 | 0
4 | 0
5 | 0
6 | 0
7 | 0
8 | 0
9 | 0
10 | 0
11 | 0
12 | 0
13 | 0
14 | 0
15 | 0
16 | 0
17 | 0
17 | 0
can you tell me what happened ?
regards
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