2009/6/22 Micha Silver <mi...@arava.co.il> > maven apache wrote: > > Thanks Micha for his help! >> Following his advise, I install the qgis,and the grass plugin and create >> new location(epsg4326),and reproj my vector map to this proj,then export it >> to kml successfully,however when add the kml to googlearth I found the layer >> doesnot match the tiff,the annex can give a clear explaination. >> The reason I export the map to kml and add it to googlearth is to make a >> thecmatic map by their areas(I have five vector maps),also I found the >> d.vect.thecmatic is to make this kind of map ,however I did not sure the >> "column" parameter,I wonder this commond is useful for my goal?\ >> > Yes it is. Reading the manual you will see: > > column=string > Name of attribute column to use for thematic display (must be numeric) > > So the column you set will be used to separate the different areas by > color. (Note the "must be numeric" part). > But I don't understand the "five vector maps".
I did have five vector layer each of which have only one categories,Actually I got the five vector from the commond "v.extract......"; > Normally you would use d.vect.thematic if you have 5 categories in *one* > vector map. Then setting i.e. column=cat would color each different cat > value a different color. Where is the generated thematic map,in the display? > If the areas are already in separate vectors, then can't you just color > each vector differently in the google earth display? > > > >
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