I could use some guidance with linear referencing and v.build.polylines.
I want to get the distances between posts along a bike trail. I have
vector maps of the trails and the posts. I've added in the start_mp and
other necessary columns to the posts database. Then I populated the
start_mp column with values in the order the post points appear along
the trail. And I've successfully run v.lrs.create on *some* of the
trails/posts. But certain trails give this error:
WARNING: Not enough points (0) attached to the line (cat 1), line skip.
and the distances come out obviously wrong (as if there are gaps) .
Thinking the problem was with extra nodes along the trails, I tried to
run v.build.polylines but what I get out is a vector with no attribute
columns (no dbf file attached).
And if I do v.digit on the new polyline vector, I can still see extra
nodes (in green) along the trail. I must be missing something simple.
So:
How do I properly add a dbf attribute table and columns to the new
polyline vector? and
What do I need to do to get a clean polyline with no nodes other than
the actual end points?
Thanks,
Micha
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