Could someone please help me? I would need to create 100 buffers (500m x 1km) along a stream polylines. I know how to do it by using shortest distance but the buffers should follow the curves of the streams. Each buffer should start from certain point (sampling site) and go to upstream for a 500m. Some of my stydy-streams have multiple tributaries on upstream areas and in those cases the buffer should follow each branch.
So far I have a polyline-layer with 100 streams and point-layer with 100 sampling points snapped together with the end of study-streams. How to proceed from here? With some network tools?
I would really appreciate some help!