> Date: Sun, 26 Feb 2012 08:47:49 -0800 (PST) > From: dpan <davepan...@yahoo.com> > Subject: [Qgis-user] Visualize Raster Timeseries with Standard Min/Max > Values > To: qgis-user@lists.osgeo.org > Message-ID: <1330274869657-4510586.p...@n6.nabble.com> > Content-Type: text/plain; charset=us-ascii > > Hi all, > > I have raster data for a single, continuous variable (e.g. tmean in May) for > a particular region of interest. I'd like to visualize the progression of > May tmean across several years with a grayscale or color ramp, to show how > it changes through time. > > qGIS by default stretches and clips each raster's grayscale ramp to the Min > and Max values for that raster. So each ramp has different Min/Max, > complicating comparison between years. > > I thus want to standardize the Min/Max values across the entire dataset. The > only way I've found to do this is to determine the Max and Min values for > the entire dataset, then enter those Min/Max values in Layer > Properties>Style for each raster. > > This is obviously impractical for large datasets (even for small ones, > really). How do I do this correctly, so I can easily generate visual > timeseries of a variable of interest?
You should be able to just style one layer with sensible Min/Max values, save the style, and make a series of copies of the resulting .qml file, named after each raster image. You should be able to make those copies at the command prompt with a single command ;) _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
