[GRASS-user] Create a point along a line in a specified distance from another point

[Johannes Radinger]

Hi,

is there an easy straight forward command to create a new point on a line
that is in a specified distance (e.g. 1000 m) from another point (on the
same line)?

Just an example (of course from river science): I have a sampling site on a
river line. I'd like to use these new point(s) to break the original river
lines in order to extract a line segment that is exactly e.g. 2000 m long
(1000 up- and downstream the sampling site).

I had a look in v.to.points but this tool only creates points in
equidistant steps irrespective of any other points (e.g. sampling points).
Another option would be using v.buffer around the sampling points and then
v.overlay. However, this approach would "cut" the river lines in euclidean
distance from the sampling site rather then in line/river distance.

Any suggestions?

/J
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