Re: [GRASS-user] Low map display resolution in default 6.4 ?
On 16/08/09 21:48, Felix Schalck wrote: After some research, I figured out that: 1) Resolution is not really the problem, since I added a shadings layer which shows the same impressive details level than I used to have in old 6.23. It is really a display question. 2) Perhaps it is the graphic driver. I did not yet found the ./configure summary of the default ubuntu GRASS .deb, but I really doubt that it is built against latest proprietary nvidia 64bits OpenGL libs - which I did in my own compilation of 6.4RC5. Fact is that display has changed for all GRASS operations (not only d.rast), and even though the new display doesn't LOOK very sharp, the levels of details is just the same, but with an impressive gain in speed. What do you think ? What do you use to display you maps ? If you use the GUI, note that the GUI does not necessarily display in the current working resolution, but often downgrades resolution for display in order to make it faster. However, you can constrain the display to your computational region's resolution. You should see no difference in display if you use x-monitors (i.e. launched with d.mon. My memories are a bit weak of that time (long ago), but I think that the 6.2 GUI still used x-monitors for display. This has changed since. Moritz ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Low map display resolution in default 6.4 ?
2009/8/17 Moritz Lennert mlenn...@club.worldonline.be: On 16/08/09 21:48, Felix Schalck wrote: After some research, I figured out that: 1) Resolution is not really the problem, since I added a shadings layer which shows the same impressive details level than I used to have in old 6.23. It is really a display question. 2) Perhaps it is the graphic driver. I did not yet found the ./configure summary of the default ubuntu GRASS .deb, but I really doubt that it is built against latest proprietary nvidia 64bits OpenGL libs - which I did in my own compilation of 6.4RC5. Fact is that display has changed for all GRASS operations (not only d.rast), and even though the new display doesn't LOOK very sharp, the levels of details is just the same, but with an impressive gain in speed. What do you think ? What do you use to display you maps ? If you use the GUI, note that the GUI does not necessarily display in the current working resolution, but often downgrades resolution for display in order to make it faster. That's was exactly my question: so GUI (I use wxpython interface) DEOS resampling to fasten dispay operations ! However, you can constrain the display to your computational region's resolution. How do you do that ? You should see no difference in display if you use x-monitors (i.e. launched with d.mon. My memories are a bit weak of that time (long ago), but I think that the 6.2 GUI still used x-monitors for display. This has changed since. Moritz ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Low map display resolution in default 6.4 ?
Moritz wrote: You should see no difference in display if you use x-monitors (i.e. launched with d.mon. My memories are a bit weak of that time (long ago), but I think that the 6.2 GUI still used x-monitors for display. This has changed since. Xmonitors + d.mon are still present in all GRASS 6.x, but they are removed in grass7. What changed is that the old d.m tcl/tk GUI used them but the new gis.m tcl/tk GUI does not. for some things like r.digit and i.ortho.photo they are still required. use them every day, Hamish ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Low map display resolution in default 6.4 ?
On 17/08/09 12:05, Hamish wrote: Moritz wrote: You should see no difference in display if you use x-monitors (i.e. launched with d.mon. My memories are a bit weak of that time (long ago), but I think that the 6.2 GUI still used x-monitors for display. This has changed since. Xmonitors + d.mon are still present in all GRASS 6.x, but they are removed in grass7. What changed is that the old d.m tcl/tk GUI used them but the new gis.m tcl/tk GUI does not. Yes, and I can't remember when the change from one GUI to the other (as default) happened... Moritz ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Low map display resolution in default 6.4 ?
After some research, I figured out that: 1) Resolution is not really the problem, since I added a shadings layer which shows the same impressive details level than I used to have in old 6.23. It is really a display question. 2) Perhaps it is the graphic driver. I did not yet found the ./configure summary of the default ubuntu GRASS .deb, but I really doubt that it is built against latest proprietary nvidia 64bits OpenGL libs - which I did in my own compilation of 6.4RC5. Fact is that display has changed for all GRASS operations (not only d.rast), and even though the new display doesn't LOOK very sharp, the levels of details is just the same, but with an impressive gain in speed. What do you think ? Felix 2009/8/15 Hamish hamis...@yahoo.com: Felix wrote: Driver: GTiff/GeoTIFF Files: srtm_38_03.tif Size is 6000, 6000 2. Region settings: $g.region -p rows: 31200 cols: 55200 rows, cols to not match. try 'g.region rast=your_imported_raster_map' Hamish ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Low map display resolution in default 6.4 ?
Felix Schalck: Since I compiled latest 6.4RC5 Grass version, I experienced significative speed gain when displaying DEM raster levels - at the expense of the displayed resolution: the whole thing just looks soappy, and keeps getting worse once you zoom in. With my previous version (6.23), the same raster display opreration (d.rast) took forever, but I had the possibility to control data errors at the finest level. So surely there must be an option I don't know yet to increase the resolution of the Map display windows; it would be very nice if somebody could explain me how it works. Hi Felix! What is the resolution of your DEM? Did you set it using g.region? Are you interested in (only) displaying or (in addition in) processing your DEM at high-resolution? . If you are new in GRASS-GIS then its worthy to read the intro(s) [1][2]. Perhaps you are looking info on how to set the resolution which is done with the module g.region[3]. ( Note that g.region != r.region ) Apologies if you are familiar with all this, Nikos --- [1] http://grass.osgeo.org/grass64/manuals/html64_user/helptext.html [2] http://grass.osgeo.org/grass64/manuals/html64_user/rasterintro.html [3] http://grass.osgeo.org/grass64/manuals/html64_user/g.region.html ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Low map display resolution in default 6.4 ?
Dear Nikos, Many thanks for your reply. But even before listing up the requested data, please noticed that, basically, I didn't change any settings (g.region) when upgrading to 6.4: I just compiled and installed the new version, and now everthing I loaded in 6.23 looks soappy in 6.4. Resolution is important for both live display in GRASS, to control data elevation errors, and further processing, since the final pgn map should be exported at the highest possible resolution. As of the requested additionnal data, here you go: 1. DEM resolution: $gdalinfo srtm_38_03.tif Driver: GTiff/GeoTIFF Files: srtm_38_03.tif Size is 6000, 6000 Coordinate System is: GEOGCS[WGS 84, DATUM[WGS_1984, SPHEROID[WGS 84,6378137,298.2572235630016, AUTHORITY[EPSG,7030]], AUTHORITY[EPSG,6326]], PRIMEM[Greenwich,0], UNIT[degree,0.0174532925199433], AUTHORITY[EPSG,4326]] Origin = (5.000,50.000) Pixel Size = (0.0008333,-0.0008333) Metadata: AREA_OR_POINT=Area Image Structure Metadata: INTERLEAVE=BAND Corner Coordinates: Upper Left ( 5.000, 50.000) ( 5d 0'0.00E, 50d 0'0.00N) Lower Left ( 5.000, 45.000) ( 5d 0'0.00E, 45d 0'0.00N) Upper Right ( 10.000, 50.000) ( 10d 0'0.00E, 50d 0'0.00N) Lower Right ( 10.000, 45.000) ( 10d 0'0.00E, 45d 0'0.00N) Center ( 7.500, 47.500) ( 7d30'0.00E, 47d30'0.00N) Band 1 Block=6000x1 Type=Int16, ColorInterp=Gray NoData Value=-32768 2. Region settings: $g.region -p projection: 3 (Latitude-Longitude) zone: 0 datum: wgs84 ellipsoid: wgs84 north: 60N south: 34N west: 11W east: 35E nsres: 0:00:03 ewres: 0:00:03 rows: 31200 cols: 55200 cells: 172224 If I interpret those numbers correctly, the region is set to the theoretical max. resolution. Again, since I basically did not touch the configs during the upgrade procedure (GRASS 6.236.4RC5) I thought to myself it might just be a configuration change of the default driver used by d.rast: in the old version, it took forever to load, but the level of details SEEMED much higher, now it loads quasi instantly, but looks 'soappy'. What changed ? Regards, Felix 2009/8/14 Nikos Alexandris nikos.alexand...@felis.uni-freiburg.de: Felix Schalck: Since I compiled latest 6.4RC5 Grass version, I experienced significative speed gain when displaying DEM raster levels - at the expense of the displayed resolution: the whole thing just looks soappy, and keeps getting worse once you zoom in. With my previous version (6.23), the same raster display opreration (d.rast) took forever, but I had the possibility to control data errors at the finest level. So surely there must be an option I don't know yet to increase the resolution of the Map display windows; it would be very nice if somebody could explain me how it works. Hi Felix! What is the resolution of your DEM? Did you set it using g.region? Are you interested in (only) displaying or (in addition in) processing your DEM at high-resolution? . If you are new in GRASS-GIS then its worthy to read the intro(s) [1][2]. Perhaps you are looking info on how to set the resolution which is done with the module g.region[3]. ( Note that g.region != r.region ) Apologies if you are familiar with all this, Nikos --- [1] http://grass.osgeo.org/grass64/manuals/html64_user/helptext.html [2] http://grass.osgeo.org/grass64/manuals/html64_user/rasterintro.html [3] http://grass.osgeo.org/grass64/manuals/html64_user/g.region.html ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Low map display resolution in default 6.4 ?
Hi Felix, On Fri, Aug 14, 2009 at 11:43 PM, Felix Schalckfelix.scha...@gmail.com wrote: ... 1. DEM resolution: $gdalinfo srtm_38_03.tif ... Pixel Size = (0.0008333,-0.0008333) ... 2. Region settings: $g.region -p ... nsres: 0:00:03 ewres: 0:00:03 which corresponds to: g.region -g ... nsres=0.000831 ewres=0.000833 That should be fine, but... If I interpret those numbers correctly, the region is set to the theoretical max. resolution. Again, since I basically did not touch the configs during the upgrade procedure (GRASS 6.236.4RC5) I thought to myself it might just be a configuration change of the default driver used by d.rast: in the old version, it took forever to load, but the level of details SEEMED much higher, now it loads quasi instantly, but looks 'soappy'. What changed ? (nothing should have changed) ... did you use d.erase to tell the GRASS monitor about the high resolution? The technology behind all is still the same in 6.4. Markus ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Low map display resolution in default 6.4 ?
Felix wrote: 2. Region settings: $g.region -p projection: 3 (Latitude-Longitude) nsres: 0:00:03 ewres: 0:00:03 rows: 31200 cols: 55200 cells: 172224 unless you have some very large monitor, I would suggest to set the resolution to say 0:01 for display purposes. g.region res=0:01 -ap raise it again if you need to do processing. 64 bit computer? or was it compiled with large file support? (your region is huge) what does r.univar say about it? Hamish ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Low map display resolution in default 6.4 ?
Felix wrote: Driver: GTiff/GeoTIFF Files: srtm_38_03.tif Size is 6000, 6000 2. Region settings: $g.region -p rows: 31200 cols: 55200 rows, cols to not match. try 'g.region rast=your_imported_raster_map' Hamish ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
