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

[Moritz Lennert]

On 17/10/17 16:10, Moritz Lennert wrote:
> On 17/10/17 15:42, Johannes Radinger wrote:
>> 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?
> 
> v.net.iso ?
> 

Or perhaps better: v.lrs.segment ?

Moritz