Well, yes, there's the mailing list, posts with questions in https://gis.stackexchange.com, twitter account and facebook community, and the issues in the GitHub repo for reporting bugs or proposing new features. Moreover, you can check https://grass.osgeo.org/learn/ for plenty of other resources (tutorials, courses, books, etc.) and the wiki ( https://grasswiki.osgeo.org/wiki/GRASS-Wiki).
I believe mailing lists work better for most of us. Also, that's where you can reach a larger audience. Having to check yet another platform to see if there are questions that are mostly already answered in the mailing list archives, tutorials or the wiki seems like a bit too much to me. However, if someone else is willing to manage such a forum, they are most welcome :) best, Vero El lun, 23 nov 2020 a las 23:22, BHARATH RAM (<[email protected]>) escribió: > Okay, thanks for the clarification. > (Also, I will remember to cc the list in future). > > I have one more question if it's okay to ask(not related to above issue). > I understand Grass GIS queries & issues are resolved through mailing lists > at the moment and the archives. Not meaning to be disrespectful of the > community, but won't it be much useful when we have a forum like website to > post & answer each others queries (it can especially be useful since > newcomers like me don't have to flood the mailing list with common issues)? > > Thank you. > > Regards, > Bharath Ram. > > On Tue, Nov 24, 2020, 3:30 AM Veronica Andreo <[email protected]> > wrote: > >> [cc-ing the list] >> >> The examples in the manuals are in meters because they are based on the >> North Carolina sample dataset which CRS is Lambert Conformal Conic. The >> units of this CRS are meters. >> >> g.proj -p >> -PROJ_INFO------------------------------------------------- >> name : Lambert Conformal Conic >> proj : lcc >> datum : nad83 >> a : 6378137.0 >> es : 0.006694380022900787 >> lat_1 : 36.16666666666666 >> lat_2 : 34.33333333333334 >> lat_0 : 33.75 >> lon_0 : -79 >> x_0 : 609601.22 >> y_0 : 0 >> no_defs : defined >> -PROJ_UNITS------------------------------------------------ >> unit : Meter >> units : Meters >> meters : 1 >> >> You have to adjust to the units of the CRS that you use when it comes to >> resolution. There's no way to set resolution in meters if you work in >> latlong. Hence the recommendation to work in projected systems. >> >> Some modules might use distance in meters for certain parameters even >> when working in latlong, because they convert such distances within the >> source code into radians (if I'm not mistaken). If not, they will raise a >> warning. Again, to avoid such issues, it's a good practice to work with >> projected CRS. >> >> best, >> Vero >> >> El lun, 23 nov 2020 a las 22:46, BHARATH RAM (<[email protected]>) >> escribió: >> >>> Dear Ms.Veronica Andreo, >>> Thank you very much for your quick reply. Yes your suggestion works >>> correctly. >>> >>> But I find it a litttle suprising since in the documentation (for >>> modukes like r.resample.stats, r.sun etc..) & in several examples meter >>> seems to be the default units used for distance and I assumed that for my >>> case as well it was the same (even though g.region -p prints out in decimal >>> degree). >>> >>> Is there any way to change the units back to meter as default? >>> >>> Thank you >>> Regards, >>> Bharath >>> >>> On Tue, Nov 24, 2020, 3:03 AM Veronica Andreo <[email protected]> >>> wrote: >>> >>>> Hello Bharath, >>>> >>>> I think your problem is that you are working in a latlong location and >>>> trying to set a resolution of 8000 degrees, which is not possible. If your >>>> desired final resolution is ~8 km, you will need to set the region >>>> resolution to its equivalent in degrees (the unit of latlong CRS). >>>> Otherwise, work with projected CRS like UTM for example (recommended). >>>> >>>> Furthermore, if you want to go from high res to lower res (upscaling), >>>> r.resamp.stats is your friend, so the second approach would be fine. The >>>> problem lays in the resolution you are setting. >>>> >>>> HTH, >>>> Vero >>>> >>>> >>>> El lun, 23 nov 2020 a las 22:20, BHARATH RAM (<[email protected]>) >>>> escribió: >>>> >>>>> Hello everyone, >>>>> >>>>> I am interested in performing resampling of a fine resolution DEM >>>>> Model (which is imported as a GTiff file in grass GIS). I tried the >>>>> following 2 approaches and neither of them was successful. Can you help me >>>>> figure out where I went wrong? Thanks in Advance. >>>>> >>>>> *Details about originally imported DEM model:* >>>>> *projection: 3 (Latitude-Longitude)* >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> *zone: 0datum: wgs84ellipsoid: wgs84north: 29Nsouth: >>>>> 28:06Nwest: 72Eeast: 77:24Ensres: 0:00:01.08ewres: >>>>> 0:00:01.08rows: 3000cols: 18000cells: 54000000* >>>>> >>>>> *MY AIM:* To convert a fine grid DEM (30 m resolution) to coarse grid >>>>> DEM (8km) >>>>> >>>>> *APPROACH 1: Using r.resample.rst* >>>>> >>>>> *g.region raster=test5_r1* >>>>> >>>>> *r.resamp.rst input=test5_r1 ew_res=8000 ns_res=8000 * >>>>> In this second command's execution, I get error (log attached below): >>>>> * Processing all selected output files will require **4 >>>>> bytes of disk space for temp files.* >>>>> >>>>> >>>>> >>>>> * Temporarily changing the region to desired resolution >>>>> ... Changing back to the original region ... >>>>> Percent complete: ERROR: Unable to seek: Invalid argument* >>>>> >>>>> *APPROACH 2: Using r.resample.stats* >>>>> *g.region raster=test5_r1* >>>>> *g.region nsres=8000 ewres=8000 *// problematic part >>>>> *r.resamp.stats -w input=test5_r1 output=test5_r1_8km* >>>>> In this second command's execution the entire map seems to get >>>>> clubbed into a single large pixel. I have attached results of *g.region >>>>> -ap* below: >>>>> * projection: 3 (Latitude-Longitude)* >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> * zone: 0 datum: wgs84 >>>>> ellipsoid: wgs84 north: 29N >>>>> south: 28:06N west: 72E east: >>>>> 77:24E nsres: 0:54 ewres: >>>>> 5:24 rows: 1 cols: 1 >>>>> cells: 1* >>>>> >>>>> >>>>> Also, can you tell me which method will be more suitable for my final >>>>> goal? >>>>> >>>>> Thanks & Regards, >>>>> Bharath >>>>> >>>>> >>>>> >>>>> >>>>> ------------------------------ >>>>> *Disclaimer: *This email and any files transmitted with it are >>>>> confidential and intended solely for the use of the individual or entity >>>>> to >>>>> whom they are addressed. If you have received this email in error please >>>>> notify the system manager. This message contains confidential information >>>>> and is intended only for the individual named. 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