Hi All, I am getting closer to what I want. Is there a way to cut the floodplain polygon where it "narrows" in, i.e. at the green lines on slide 6. I need some way of automating this. https://docs.google.com/presentation/d/1x7IQ3BJlLLSb6R2atxIIiaeWzyCqCZQ3uWaGPZyo6ds/edit#slide=id.g45038c0552_0_0 Thanks Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant*
On Tue, Oct 16, 2018 at 10:45 AM Shane Carey <careys...@gmail.com> wrote: > What about obtaining the main direction of the river (North - South/ East- > West) and creating the rows/columns based on that? Any advice/ help would > be appreciated! > Thanks all > Le gach dea ghui, > *Shane Carey* > *GIS and Data Solutions Consultant* > > > On Tue, Oct 16, 2018 at 7:49 AM Shane Carey <careys...@gmail.com> wrote: > >> Ok, I seem to be getting closer to what I need. It works well where the >> river is perpendicular to the column (see slide 3) but where it is >> parrallel (see slide 4), I would need to obtain a rows map. Is there any >> way of being able to tell it to create rows or columns based on the river >> direction? >> >> <http://goog_326768947> >> >> https://docs.google.com/presentation/d/1x7IQ3BJlLLSb6R2atxIIiaeWzyCqCZQ3uWaGPZyo6ds/edit?usp=sharing >> >> Or if you think there is a better way of reaching my end goal (slide 2), >> I would be interested in hearing your thoughts. >> Thanks >> >> Thanks >> >> Le gach dea ghui, >> *Shane Carey* >> *GIS and Data Solutions Consultant* >> >> >> On Tue, Oct 16, 2018 at 6:38 AM Johannes Radinger < >> johannesradin...@gmail.com> wrote: >> >>> It seems that would would like to have your floodplain cut based on the >>> columns of the underlying raster-resolution (and not perpendicular to the >>> river line as initially stated). You could use mapcalc to generate a column >>> raster map (r.mapcalc expression="colmap = col()") which you could then >>> transform to a vector map and use to intersect with your floodplain vector. >>> >>> best >>> Johannes >>> >>> On Tue, Oct 16, 2018 at 1:24 AM Shane Carey <careys...@gmail.com> wrote: >>> >>>> Hi All, >>>> >>>> I don't think v.transects is going to work for me as lines appear to be >>>> cutting across each other. Is there another tool in Grass that can cut the >>>> floodplain polygon into 5m lengths (as green lines in image attached) >>>> >>>> Thanks >>>> >>>> >>>> >>>> On Luan 15 DFómh 2018 at 15:38, Shane Carey <careys...@gmail.com> >>>> wrote: >>>> >>>>> Great thanks, is there anything available that will snap these lines >>>>> to the polygon edges? >>>>> >>>>> Thanks >>>>> Le gach dea ghui, >>>>> *Shane Carey* >>>>> *GIS and Data Solutions Consultant* >>>>> >>>>> >>>>> On Mon, Oct 15, 2018 at 3:30 PM Markus Neteler <nete...@osgeo.org> >>>>> wrote: >>>>> >>>>>> On Sun, Oct 14, 2018 at 11:28 PM Shane Carey <careys...@gmail.com> >>>>>> wrote: >>>>>> > >>>>>> > Hi, >>>>>> > >>>>>> > I need to cut a floodplain polygon into one meter strips which are >>>>>> perpendicular to the river. This needs to be an automated process. Just >>>>>> wondering has anyone ever done this or similar in Grass GIS through >>>>>> python >>>>>> or a bash script? >>>>>> > >>>>>> > The link attached shows two slides. Stage one is the first slide >>>>>> and slide two is what I hope to end up with. >>>>>> > >>>>>> > >>>>>> https://docs.google.com/presentation/d/1x7IQ3BJlLLSb6R2atxIIiaeWzyCqCZQ3uWaGPZyo6ds/edit?usp=sharing >>>>>> >>>>>> This addon seems to do (similar) perpendicular line creation: >>>>>> v.civil - Generates a alignment for designing roads, channels, and >>>>>> ports in civil engineering >>>>>> https://grass.osgeo.org/grass7/manuals/addons/v.civil.html >>>>>> >>>>>> Best >>>>>> Markus >>>>>> >>>>>> -- >>>>>> Markus Neteler, PhD >>>>>> http://www.mundialis.de - free data with free software >>>>>> http://grass.osgeo.org >>>>>> http://courses.neteler.org/blog >>>>>> >>>>> -- >>>> Le gach dea ghui, >>>> *Shane Carey* >>>> *GIS and Data Solutions Consultant* >>>> _______________________________________________ >>>> grass-user mailing list >>>> grass-user@lists.osgeo.org >>>> https://lists.osgeo.org/mailman/listinfo/grass-user >>> >>>
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