Hi Paulo and Helmut, Did you consider using cStringIO, if you need a file-object? That would avoid the temporary file and thus should be more efficient too. See attached diff (it is probably not necessary to remove the last line break though).
Just a suggestion. Yet, there might be even more efficient solutions. For example raster2numpy from pygrass... https://grass.osgeo.org/grass74/manuals/libpython/pygrass.raster.html#pygrass.raster.raster2numpy Here however, you would have to mask NULL and I am not sure how to (platform-independent) determine values that represent NULL in a raster map. This gives pointers but there are again issues with Windows it seems: https://grasswiki.osgeo.org/wiki/GRASS_Python_Scripting_Library#Interfacing_with_NumPy And it leaves the question how to find out if a raster is Integer or not... With pygrass you could do: from grass.pygrass import raster as r p = np.ma.masked_equal(r.raster2numpy(raster), np.nan)) # For floating point rasters on Linux or p = np.ma.masked_equal(r.raster2numpy(raster), -2147483648)) # For integer rasters Hints from experienced Python/Numpy developers would be appreciated... That makes me wonder if it would be worth to add/collect recommendations for how to solve such common operations (like e.g. parsing table output from grass commands) either e.g. here: https://trac.osgeo.org/grass/wiki/Submitting/Python or here: https://grasswiki.osgeo.org/wiki/GRASS_and_Python ? Cheers Stefan From: grass-user [mailto:grass-user-boun...@lists.osgeo.org] On Behalf Of Paulo van Breugel Sent: lørdag 3. februar 2018 09.14 To: Helmut Kudrnovsky <hel...@web.de>; email@example.com Subject: Re: [GRASS-user] Issue with addon r.vif in MS Windows GUI installations (stand-alone v. 7.2.2 and 7.0.5) On February 2, 2018 8:52:03 PM Helmut Kudrnovsky <hel...@web.de<mailto:hel...@web.de>> wrote: >>Any idea how I can do that in such a way that it works on both Linux and > Windows? > > in r.vif script I've changed the relevant lines: > > <---------------------------------------- > # Get the raster values at sample points > fd, tmpcov = tempfile.mkstemp() > with open(tmpcov, "w") as text_file: > text_file.write( > gs.read_command("r.stats", flags="1n", input=raster, > quiet=True, separator="comma")) > p = np.loadtxt(tmpcov, skiprows=0, delimiter=",") > > # Clean up > text_file.close() > os.close(fd) > os.remove(tmpcov) > if not n == "100%": > gs.run_command("r.mask", flags="r", quiet=True) > if exist_mask['fullname']: > gs.run_command("g.rename", raster=[mask_backup, "MASK"], > quiet=True) > return(p) > ----------------------------------------> > > and tested the script in winGRASS; it seems to work in windows; not tested > on linux and mac. > > Ok, thanks Helmut, I'll see if that works in Linux too > > ----- > best regards > Helmut > -- > Sent from: http://osgeo-org.1560.x6.nabble.com/Grass-Users-f3884509.html > _______________________________________________ > grass-user mailing list > firstname.lastname@example.org<mailto:email@example.com> > https://lists.osgeo.org/mailman/listinfo/grass-user
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