Re: [GRASS-user] Import GRIB files to GRASS
I'm planning on using some global meteo datasets that are distributed in GRIB format. has anyone ever tried to parse GRIB NCEP files to GRASS? It is so interesting to see vastly different approaches to solve a similar problem. I'm downloading NOAA forecast data which is in GRIB format. I run the files through degrib and then parse the shape files with a C program using the shapelib libraries and create a new shape file which I import into GRASS with v.in.ogr. I plot the values with d.vect.thematic. The resulting maps can be viewed at: http://www.ars.usda.gov/npa/marc/heatstress That reminds me, I originally set up a location for each region with an eye forward on multithreading the map generation phases. I forgot the reason in the middle of the project and created several regions in one location. I had to revert back to a location for each region when I implemented multithreading but reduced the total map generation time from several hours to 15 minutes. :-) Randy ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Newbie, running python on Mac, error on execl
The first thing to check would be the file permission bits on the file hi.py to be sure the execute bit is set. From your command line, just type ls -al hi.py. The first 10 characters from the output should show you what bits are set and you are looking for an x in the fourth character. For example: -rwxr--r-- This means the owner has read,write,execute privileges while group and world have read only. If you don't have execute privileges, simple type: chmod u+x hi.py Hope this helps. The same thing was driving me batty until this morning on a Linux machine after splitting a script into two parts. The old one had the execute bit set but the new one didn't. Randy On 04/06/10 12:31 PM, AhmadKhaled vb...@yahoo.com wrote: python hi.py map=geol...@permanent and I got the following error: execl() failed: Permission denied ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Newbie... Locations, Projections, Regions, choices? (long)
On 03/31/10 2:57 AM, Micha Silver mi...@arava.co.il wrote: It looks like you're off to a good start. All you need to do, in the aeaConUs location, is save a few regions. Begin with: g.region vect=states_vect save=ConUS You might want to save this Continental zoom as the default with g.region -s ConUS Then zoom to each of the E,Central,W etc areas and save an additional region, i.e. (after zooming to central region): g.region save=Central You can alternatively specify the region bounds with something like: g.region save=Central west=-120 east=-110 ... This all can be done in the GUI with Config-Region. Now you jump to each of the saved regions with g.region reg=Central etc... Thanks Micha. Good to know I¹m on the right course. After the first step: ³g.region vect=States save=ConUS² I can indeed ³zoom to saved region² in the display to view the map. However, g.region region=ConUS shows: projection: 99 (Albers Equal Area) zone: 0 datum: wgs84 ellipsoid: wgs84 north: 1838.08985202 south: 34.12860299 west: -1467.66023444 east: 1403.23869107 nsres: 0.0531 ewres: 0.0498 rows: 36079 cols: 57418 cells: 2071584022 Unfortunately, the bounds are all offset from the central axis so I can¹t use the lat. lon. values for the boundaries as you suggest. (ie west=-120 east=-110) I can overlay a grid and get a good estimate of values that will work to define my regions. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Newbie... Locations, Projections, Regions, choices? (long)
All, I need to create 6 regional maps of the continental U.S., north and south by west, central, and east. My first thought was to create 7 locations (one for the entire continental US) but my second thought was to create just one location with the default region as the entire continental US and 6 other regions. Is this sound logic? First I downloaded the States data from the National Atlas. I then created a latitude - longitude location and imported the shape file excluding Alaska, Hawaii, Puerto Rico, and the Virgin Islands. g.proj -p -PROJ_INFO- name : Latitude-Longitude datum : wgs84 towgs84: 0.000,0.000,0.000 proj : ll ellps : wgs84 -PROJ_UNITS unit : degree units : degrees meters : 1.0 g.region -p projection: 3 (Latitude-Longitude) zone: 0 datum: wgs84 ellipsoid: wgs84 north: 49N south: 25N west: 125W east: 67W nsres: 0:00:30 ewres: 0:00:30 rows: 2880 cols: 6960 cells: 20044800 The map displays fine but I want to change the projection to Albers Equal Area or Lambert Conformal Conical since it is such a large area. So I created a new location: aeaConUS with one caveat. It said the eastern value had to be larger than the western value so I (perhaps wrongly) used 125 for the western boundary and 67 for the eastern. Using the GUI selected the ³VectorDevelop mapReproject vector² menu item and selected the vector from the above location. Here is what the new location and default region looks like: g.proj -p -PROJ_INFO- name : Albers Equal Area datum : wgs84 towgs84: 0.000,0.000,0.000 proj : aea ellps : wgs84 a : 6378137.00 es : 0.0066943800 f : 298.2572235630 lat_0 : 23.00 lat_1 : 29.50 lat_2 : 45.50 lon_0 : -96.00 x_0: 0.00 y_0: 0.00 -PROJ_UNITS unit : mile units : miles meters : 1609.344000 g.region -p projection: 99 (Albers Equal Area) zone: 0 datum: wgs84 ellipsoid: wgs84 north: 49 south: 25 west: -125 east: -67 nsres: 0.05 ewres: 0.05 rows: 480 cols: 1160 cells: 556800 When I first try to display this map, nothing is displayed unless I select ³Zoom display to selected map² at which point my nice Albers map gets displayed. Or I can ³zoom out² about 20 times to make the Albers map start showing up near the top of the screen. Obviously I¹m doing something wrong here but I¹m not sure if its the units (meters vs miles) or something more fundamental. Drowning in a sea of GRASS and loving it! Thanks for any suggestions, Randy ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
