On Tue, Jul 17, 2012 at 12:19 PM, Enrico G <mrenric...@gmail.com> wrote: > Hello everybody, > > I am trying to understand if GRASS fits me with its v.lrs module and how can > I use it
I have created a (yet minimal) new Wiki page: http://grass.osgeo.org/wiki/Linear_Reference_System On the page, there are two articles listed which may be of interest, > I work as a marine surveyor mainly in the offshore oil & gas industry, > occasionly cable & environmental as well. > In this environment, everything is referenced to a (p)line and its offsets. > > Offset here are usually meters off a line, + or - outside a line (depending > on bearing), which is a different referencing method than the one used in > v.lrs, correct? In GRASS, an offset is the distance from a milepost along the line. > I.e. > > -------A------------------ > 0----1----3----4----5----6 > -------------------------- > -------------------B------ > > A = KP 1.25 DX = 1 > B = KP 4.75 DX = -2 > > where: > KP = miles post (distance from start of line) > DX = offset Why is this distance to the line important for you? It won't be reached anyway if not connected. On the other hand, GRASS supports deviations, see http://grass.osgeo.org/grass64/manuals/html64_user/lrs.html Sorry for the delay in answering, Markus _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user