Re: [GRASS-user] Display of Terrain Perameter Maps
On Tuesday 02 March 2010, Rich Shepard wrote: > On Tue, 2 Mar 2010, Dylan Beaudette wrote: > > I have found that with a certain amount of smoothing (r.param.scale , > > r.neighbors) and the right color scheme (r.colors [-e]) one can generate > > pretty nice looking maps that display overall trends. > > Dylan, > >I used r.param.scale extensively; will learn r.neighbors. > > > One thing to remember-- most GRASS modules are geared towards analysis-- > > making pretty maps comes second. > >That's very true. However, when the analytical results need to be > presented to non-technical decision-makers (lawyers, regulators, > politicians) it's vital that the presentations be visually attractive. It > adds credibility to the analytical results and, like typeset docuements > rather than word processed ones, makes them more easily accepted. > I agree 100% -- All I was getting at was that the nice map-making requires some creativity. If you have some time check out GMT-- it can generate some very nice looking maps in PS/EPS format. There are some scripts on the GRASS add-ons wiki page with some ideas. Cheers, Dylan -- Dylan Beaudette Soil Resource Laboratory http://casoilresource.lawr.ucdavis.edu/ University of California at Davis 530.754.7341 ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Display of Terrain Perameter Maps
On Tue, 2 Mar 2010, Dylan Beaudette wrote: I have found that with a certain amount of smoothing (r.param.scale , r.neighbors) and the right color scheme (r.colors [-e]) one can generate pretty nice looking maps that display overall trends. Dylan, I used r.param.scale extensively; will learn r.neighbors. One thing to remember-- most GRASS modules are geared towards analysis-- making pretty maps comes second. That's very true. However, when the analytical results need to be presented to non-technical decision-makers (lawyers, regulators, politicians) it's vital that the presentations be visually attractive. It adds credibility to the analytical results and, like typeset docuements rather than word processed ones, makes them more easily accepted. Rich ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Display of Terrain Perameter Maps
On Monday 01 March 2010, Rich Shepard wrote: >The output maps from r.slope.aspect. r.resamp.rst, and even r.topidx the > output maps have values for each cell rather than trends. This is very > difficult to interpret by non-technical viewers. > >I've seen maps of slopes, profile and planar curvature, and topographic > wetness indices that are more smoothly colored. If one wants to determine > the curvature of slopes adjacent to a specific cell at its base it would be > easier to see this if the values do not change with each cell. When we > stand at the foot of a hill we tend to not focus on each detail of the > terrain but the overall slope, profile curvature, and planar curvature. > It's this type of overview that I'm trying to display. > >Is there a way to get smoother output maps that are visually more > informative to non-specialists? > > Rich > ___ > grass-user mailing list > grass-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/grass-user Hi Rich, I have found that with a certain amount of smoothing (r.param.scale , r.neighbors) and the right color scheme (r.colors [-e]) one can generate pretty nice looking maps that display overall trends. One thing to remember-- most GRASS modules are geared towards analysis-- making pretty maps comes second. Dylan -- Dylan Beaudette Soil Resource Laboratory http://casoilresource.lawr.ucdavis.edu/ University of California at Davis 530.754.7341 ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Display of Terrain Perameter Maps
On Tue, 2 Mar 2010, Glynn Clements wrote: Filter the input data with r.neighbors[1], r.mfilter, etc. [1] I wouldn't use method=mode if you're going to calculate derivatives. I'm not so sure about method=median either. I appreciate learning of options that did not strike me as appropriate when I looked through the module list. Thanks, Glynn, Rich ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Display of Terrain Perameter Maps
Rich Shepard wrote: >The output maps from r.slope.aspect. r.resamp.rst, and even r.topidx the > output maps have values for each cell rather than trends. This is very > difficult to interpret by non-technical viewers. > >I've seen maps of slopes, profile and planar curvature, and topographic > wetness indices that are more smoothly colored. If one wants to determine > the curvature of slopes adjacent to a specific cell at its base it would be > easier to see this if the values do not change with each cell. When we stand > at the foot of a hill we tend to not focus on each detail of the terrain but > the overall slope, profile curvature, and planar curvature. It's this type > of overview that I'm trying to display. > >Is there a way to get smoother output maps that are visually more > informative to non-specialists? Filter the input data with r.neighbors[1], r.mfilter, etc. [1] I wouldn't use method=mode if you're going to calculate derivatives. I'm not so sure about method=median either. -- Glynn Clements ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Display of Terrain Perameter Maps
Rich: > Is there a way to get smoother output maps run eg 'r.neighbors method=mode' to smooth/denoise maps 'r.param.scale param=feature' also offers a simplified version. both modules allow you to change the search window size. the bigger the window, the more smoothing. Hamish ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
