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zoom to the extent you're after optionally, ctrl-b to save the extent rectangle select the polygons (drag over the whole canvas extent) vector > geometry tools > buffer (selected features only, distance .001 or less, dissolve results) This will expand the coastline outwards just enough to overlap across the line, the dissolve will 'heal' the gap. You ...


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Maybe a slightly different approach will match your needs. Try looping thru all the elevations that you will be snipping from felt, and create a raster for each, then convert each to a polygon vector. You'll end up with lots of separate polygons, one for each elevation, ready for the scissors. For e in 10 20 30 40 50 60 70 80 90 100; do r.mapcalc ...


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Steven already shared a very good walk-through! I just want to add that you could also use the QGIS LecoS plugin (requires active numpy/scipy installation within your QGIS path) for this purpose. Especially for raster basic cleaning and edge extraction purposes. LecoS has a so-called landscape modifier since some time, which applies scipy's erosion ...


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I'm not sure how well this will work without trying on your specific raster, but a few pointers. I assume from your image you used Threshold in GIMP to give you a binary raster (inside field/outside field) Removing noise You can use GDAL Sieve to remove the 'salt and pepper' noise - those little holes within the fields. You can do this from QGIS (Raster ...


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In 2.10.1 I'm able to access GRASS Tools panel, and GRASS toolbar by: Enabling GRASS plugin Go to Menu Bar / View / Panels and confirm GRASS Tools is checked Go to Menu Bar / View / Toolbars and confirm GRASS is checked Then, I'm able to click the 'New Mapset' button in the GRASS Toolbar.


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I think the simplest answer is no. The GRASS LIDAR docs state: v.in.lidar - (GRASS 7 only; GRASS must be compiled with libLAS support). Which the GRASS 7.0 Ubuntu packages do not appear to have. From the latest build log (amd64): GRASS is now configured for: x86_64-pc-linux-gnu ... GDAL support: yes GEOS support: ...


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Have you enabled the advance interface :


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Under Windows you have a "special version" of QGIS with GRASS available: Start this special version and enable the now available grass-plugin: Go to Menu Bar / View / Panels and check, that its enabled (should be already by default) Go to Menu Bar / View / Toolbars and check, that its enabled (should be already by default)


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Use r.composite to merge the bands back into a single raster. This is the example from the documentation page: r.composite blue=lsat7_2002_10 green=lsat7_2002_20 red=lsat7_2002_30 output=lsat7_2002_rgb Don't forget to set your region!


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Topology means "the rules and behaviors that model how points, lines, and polygons share coincident geometry." (Source.) These rules can apply specifically to geometry and how it is stored, or be created by you to check for certain things. Topology Checker looks at rules you have set up or chosen to apply to the data. Things like a line must be inside a ...


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This might do it: r.mapcalc "distances_with_negatives = if(isnull(B), -1.0*A, A)"


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Adding a .tif extension to the file name solved the problem.


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I would not be too sure that the downgrade from GDAL 1.11 to 1.10 was really clean. If you want to stick to that GDAL version, I suggest to re-build QGIS again with it. Upgrading to GDAL 1.11 is surely better, but if you need ecw support on Ubuntu, you might run into problems there (see Unable to install ECW support on lubuntu 14.04 for that). On the other ...


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Since you put GRASS into the tags, here's a solution based on GRASS: First, you need to know exactly what coordinate system the original data is in (as always with GRASS). I see that the *.prj file contains "TRANSVERSE MERCATOR" but it's not one of the standard UTM zones. Since you have not mentioned the EPSG code of this data, here's the proj4 string for ...


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As far as I know, before using v.net.salesman to get your route, you should connect your points layer to your network (line vector layer) using v.net op=connect [1] at nlayer=2 Once you connect your 12 points to your network as nodes, you'll be able to select your nodes layer from the "input nodes" dropdown menu. Hope this helps. Cheers, LluĂ­s [1] ...



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