Thank you all. Well i have some news. Hamish i have followed your suggestion of using the mapcalc commands. For all this steps i worked directly through GRASS 6.4 0RC6 and not QGIS. I have opened the grass raster layer with the contours (lines) and applyed the commands suggested: http://grass.osgeo.org/wiki/Contour_lines_to_DEM The result was this: http://osgeo-org.1803224.n2.nabble.com/file/n5549840/shadedtest1.jpg Well it seems the terrace effect desappeared but there are some glintches, do you think its normal? Concerning the flat mesa tops they look really ugly, any suggestion how to remake/remodel them? I suppose i have to go to the original geotiff topography chart and remake some vector lines to overcome that problem? What should i do?
About the blackspots and the color table im not sure but changing it doesnt overcome the problem, the spots remain the same. Here it is the r.univar report of the shadedrelief layer: "total null and non-null cells: 2256660 total null cells: 6164 Of the non-null cells: ---------------------- n: 2250496 minimum: -75.1119 maximum: 100 range: 175.112 mean: 42.1701 mean of absolute values: 48.816 standard deviation: 35.304 variance: 1246.37 variation coefficient: 83.718 % sum: 94903752.6220222563" Now to the strange issue (QGIS Shaded Relief Plugin). Remember the error i posted earlier? Well it seems i was able to work with that plugin but only after i run the surf contour layer in GRASS. Let me explain i redone the steps decribed before as suggested by Hamish (mapcalc, surfcontour,etc...), all in GRASS 6.4 0RC6. Then changed to QGIS, opened the layer just made in GRASS and run the QGIS Shaded Relief Plugin. Now it worked. About the Region Settings they were set in QGIS. Since the region im working is fairly small i used this parameters: N-S Res = 1.00014 and E-W Res = 1.00024 (I think this is the minimum resolution supported). One problem i noticed and it might be a QGIS bug is that everytime i open QGIS or add a layer it resets the projection/coordination values (For example im using Datum ED50 UTM zone 29 international ellipsoid but when i open a layer or QGIS it always resets this values to others). Maybe i should save this parameters directly in GRASS? My dificulty is how, there are so many commands for a begginer :-) Regards and thank you Nuno -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/QGIS-GRASS-plugin-shadedrelief-issue-tp5547443p5549840.html Sent from the Grass - Users mailing list archive at Nabble.com. _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
