New answers tagged contour
in the properties of your raster layer, select "style", then render type "single band pseudocolor". You can click on classify to specify your intervals, and you can select the color ramp that you find most appropriate.
simple. before performing raster to topo you need to add a single polygon (input) which will be your desired boundary and change type to boundary (yes there is a dropdown key there) goodluck :)
Use r.quantile to find the 95% percentile, then with that value fed into r.mapcalc create a new raster with values <= the 95% percentile. i.e. GRASS 7.0.svn (ITM):~/geodata > r.quantile dem perc=95.0 Computing histogram 100% Computing bins Binning data 100% Sorting bins 100% Computing quantiles 0:95.000000:735.000000 GRASS 7.0.svn (ITM):~/geodata ...
If you want to extract a specific elevation as contour level, then use the parameters minlevel=value and maxlevel=value of the command r.contour. Note: r.contour.step on QGIS's processing toolbox does have min and max parameters as options.
I assume your goal is to have different stroke weights for multiples of certain values - ie, one line weight for lines that are multiples of 10M, another for multiples of 100M, and so on. The details of how to do this depend on your software, but my general approach is to open the attribute table associated with the shapefile and add a new field which will ...
I've researched this problem for a while and to my knowledge it cannot be easily done with tools at Your disposal. Although GME is not as difficult as You think. Give it a try. But for me the perfect option is R. There are many packages that can generate KDE (ks for example) and You can get PVC for any value You want with wild1 package. Then it is a simple ...
For the contouring there are several open source solutions like CONREC from Paul Bourke, OPENCV has also a proper contouring algorithms and my stuff is also available. The more complex stuff, to build the regular mesh from a irregular point set can be done by triangulation and resampling with triangle or CGAL.
You can find contour tools in GME or ETgeowizard. If you want to create contour from points, you could try reclassify your points into some height categories, then use dissolved buffer, but this will create artefacts. A proper way is to use Thiessen polygons, but this will require huge processing (and you'll need advanced licence).
Well re-vectorization doesn't seem to be the key to a good solution here. As @Andre points out, the OSM Openlayers plugin just adds a raster layer. You can pick an OSM map (as cyclemap) that is postprocessed to include height contour lines, but in general height data (DEM) aren't part of the (current) OSM data model. So the contour lines are derived from ...
The Openlayers plugin does not deliver a raster image, but a bunch of 256x256 tiles instead. The raster to vector converter can not handle these tiles. It would be possible to prefetch all tiles you need, then build a vrt around them, and vectorize that. But that would be unnecessary much work. The contours come from NASA SRTM mission, and there are many ...
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