Trying to measure minimum distance between contour lines on two different sides of a Strait on QGIS (i.e., 10m to 10m =? km, 0 to 0m = ? km, -10m to -10m = ? km). I have used the manual tool previously, but wondering if there is a more robust/accurate way of doing this with the analyses tools.
Dear Sam Nicholson,
I suggest you to see links on subject.
https://www.qgistutorials.com/en/docs/interpolating_point_data.html
https://www.qgistutorials.com/en/docs/3/calculating_line_lengths.html
https://docs.qgis.org/3.4/en/docs/gentle_gis_introduction/spatial_analysis_interpolation.html
https://pro.arcgis.com/en/pro-app/latest/help/analysis/raster-functions/contour-function.htm
https://bnmjjwinf292.com/mk3ngxw9g?key=9ac39027cb33e3c46c0a24a0baa37bde
https://woostuff.wordpress.com/2011/02/24/generating-contour-lines-in-qgis/
Best regards
Dear Sam Nicholson ,The following link will explain in a very simple way:
https://www3.nd.edu/~cneal/planetearth/Lab-SurfaceHydrology/TopoMaps.html
My way of achieving this was probably inefficient, but here is the method. Filter contours to desired elevation. Convert contours to vertices. Do this twice, as you'll need a copy. For one vertices layer, delete all vertices on one side of the strait. For the other vertices layer, delete all vertices on the opposite side of the strait. You should now have two vertices layers; both will be associated to one side of the Strait. Rename the vertices layers to include their respective side of the Strait. I.e., "Vertices Gibraltar" and "Vertices Morocco". Now, use the "Distance to nearest hub (point)" tool under vector analysis. Use either vertices layer as the input and the other as the output, use the "ID" column as the comparison. When you run the analysis, this will figure out the distance of all vertices on one side of the Strait to all vertices on the other side, and return the shortest distance for all vertices. You can then use the filter tool to find the shortest "hub distance" node.
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