Another approach would be from a DEM, generate slope and aspect. Add the values to a point vector layer and follow Imhof's rules.
I made a similar experiment many moons ago. Check the last two photos in this post: http://epsg4253.wordpress.com/2012/05/14/alternatives-to-relief-shading/ "The arrows depicts the direction of the surface (aspect) while the line thickness depicts the steepness of the gradient (slope)." On Fri, Apr 18, 2014 at 3:36 PM, Frank Broniewski <[email protected]> wrote: > Hi, > > I'd like to construct manually some hachures in order to show the > terrain form, like in ye olde maps > (http://en.wikipedia.org/wiki/Hachure_map) > > I am working with contours that I have available. Using the snapping > options I can already draw lines between two contour lines just fine, > but a hachure line is usually drawn in the direction of the steepest > slope. So it would be useful to have a length indicator, just like with > the measurement tool, when digitizing lines. Because the shortest > distance between two points would represent the steepest slope and that > is what I want to know. > > So how can I get the current line length while digitizing? Is there some > plugin? I am also not afraid of using Python to achieve this, but I've > never done any QGIS modding so far ... > > Many thanks, > > Frank > > > -- > Frank BRONIEWSKI > > METRICO s.à r.l. > géomètres > technologies d'information géographique > rue des Romains 36 > L-5433 NIEDERDONVEN > > tél.: +352 26 74 94 - 28 > fax.: +352 26 74 94 99 > http://www.metrico.lu > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user -- cheers, maning ------------------------------------------------------ "Freedom is still the most radical idea of all" -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ ------------------------------------------------------ _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
