[GRASS-user] Re: grass-user Digest, Vol 47, Issue 52
Nathaniel Iwuchukwu
ikechinedu at gmail.com
Mon Mar 29 02:58:52 EDT 2010
Please what's the procedure or commands for extrating road network from a
raster map? i think i have been going round the circle with classofocation
and rectification of image. i have used this commands but i don't get any
results:
i.group
i.composite
i.class
i.cluster
r.digit
i.maxlik
i.gensigset
nothing seems to get me the road network result i want.
Please i need help and i am running GRASS on Linux Ubuntu.
thanks.
On Mon, Mar 22, 2010 at 11:09 AM, <grass-user-request at lists.osgeo.org>wrote:
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> Today's Topics:
>
> 1. ERROR: G_malloc: unable to allocate 2147483648 bytes at
> main.c:153 (ikechinedu at gmail.com)
> 2. Re: importing dem files: projection details? (Markus Neteler)
> 3. Re: ERROR: G_malloc: unable to allocate 2147483648 bytes at
> main.c:153 (Hamish)
> 4. Re: make command (install add on) (schorschli)
> 5. Helpp needed to call Grass from inside Python Plugin
> (Bishwarup Banerjee)
> 6. grass editing (Gary Nobles)
> 7. Re: ERROR: G_malloc: unable to allocate 2147483648 bytes at
> main.c:153 (Glynn Clements)
> 8. Osgeo4W grass error (Pablo Carreira)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 21 Mar 2010 13:02:00 -0700
> From: ikechinedu at gmail.com
> Subject: [GRASS-user] ERROR: G_malloc: unable to allocate 2147483648
> bytes at main.c:153
> To: grass-user at lists.osgeo.org
> Message-ID:
> <4529578.106556.1269201720004.JavaMail.root at jim.nabble.com>
> Content-Type: text/plain; charset=us-ascii
>
> Hi, i am trying extract road network from a raster map but each time i run
> the image filter, i get this error message: ERROR: G_malloc: unable to
> allocate 2147483648 bytes at main.c:153.
>
> i also connnot use the i.class command on my windows machine which is the
> platform i am working with. please how can i extract a road network from
> raster map on windows platform?
> thank you.
> Nathaniel
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 22 Mar 2010 00:23:48 +0100
> From: Markus Neteler <neteler at osgeo.org>
> Subject: Re: [GRASS-user] importing dem files: projection details?
> To: Tyler Smith <tyler.smith at eku.edu>
> Cc: GRASS user list <grass-user at lists.osgeo.org>
> Message-ID:
> <86782b611003211623x6f777673t62a66fff6526f2d at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On Mon, Mar 15, 2010 at 7:38 PM, Tyler Smith <tyler.smith at eku.edu> wrote:
> > On 03/15/2010 09:38 AM, Markus Neteler wrote:
> >> On Mon, Mar 15, 2010 at 1:35 PM, Tyler Smith<tyler.smith at eku.edu>
> wrote:
> >>> On 03/15/2010 03:42 AM, Markus Neteler wrote:
> >>>
> >>> Trying the auto route:
> >>>
> >>> grass64 -gui
> >>> select define new location with georeferenced file
> >>> select the dem file: k42.dem
> >>> select the TN transformation, as probably better than the default for
> >>> adjacent Kentucky
> >>> enter GRASS with the newly created location and the PERMANENT mapset
> >>>
> >>> Results in this error:
> >>>
> >>> "g.proj or projection error: ERROR: default region is invalid
> >>> line 3:<north: 1080:43:46N>"
> >>>
> >>> So GRASS has automatically set up the location using degrees, and then
> >>> get
> >>> confused when the raster co-ordinates are provided in meters. Which
> >>> appears
> >>> to be fairly close to the sort of problem I ran into when setting this
> up
> >>> manually. What am I missing?
> >>>
> >>
> >> Please post the output of gdalinfo on that file. GRASS uses GDAL to
> detect
> >> projections from metadata.
> >>
> >> Markus
> >>
> >
> > Thanks for help! Here it is:
> >
> > gdalinfo k42.dem
> > Driver: USGSDEM/USGS Optional ASCII DEM (and CDED)
> > Files: k42.dem
> > Size is 1222, 1535
> > Coordinate System is:
> > GEOGCS["NAD83",
> > DATUM["North_American_Datum_1983",
> > SPHEROID["GRS 1980",6378137,298.257222101,
> ...
> > Metadata:
> > AREA_OR_POINT=Point
> > Corner Coordinates:
> >
> > Upper Left ( 1467.054, 1080.729)
> > Lower Left ( 1467.054, 1067.938)
> > Upper Right ( 1477.237, 1080.729)
> > Lower Right ( 1477.237, 1067.938)
> > Center ( 1472.146, 1074.334)
> ...
>
> I get actually a somewhat different result (GDAL trunk):
>
> gdalinfo m40.dem
> Driver: USGSDEM/USGS Optional ASCII DEM (and CDED)
> Files: m40.dem
> ...
> Corner Coordinates:
> Upper Left ( 1447.317, 1055.177) (Invalid angle,Invalid angle)
> Lower Left ( 1447.317, 1042.411) (Invalid angle,Invalid angle)
> Upper Right ( 1457.509, 1055.177) (Invalid angle,Invalid angle)
> Lower Right ( 1457.509, 1042.411) (Invalid angle,Invalid angle)
> Center ( 1452.413, 1048.794) (Invalid angle,Invalid angle)
> Band 1 Block=1223x1532 Type=Float32, ColorInterp=Undefined
> NoData Value=-32767
> Unit Type: ft
>
> You may want to signal this as GDAL bug in the GDAL butracker:
> http://trac.osgeo.org/gdal/
>
> Unless GDAL doesn't read it correctly, it won't be understood by GRASS.
> I tested with
> ftp://ftp.kymartian.ky.gov/dems_usgs/m39.dem.zip
>
> Markus
>
>
> ------------------------------
>
> Message: 3
> Date: Sun, 21 Mar 2010 22:41:12 -0700 (PDT)
> From: Hamish <hamish_b at yahoo.com>
> Subject: Re: [GRASS-user] ERROR: G_malloc: unable to allocate
> 2147483648 bytes at main.c:153
> To: grass-user at lists.osgeo.org, ikechinedu at gmail.com
> Message-ID: <373432.58091.qm at web110015.mail.gq1.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
>
> Nathaniel wrote:
> > Hi, i am trying extract road network
> > from a raster map but each time i run the image filter, i
> > get this error message: ERROR: G_malloc: unable to allocate
> > 2147483648 bytes at main.c:153.
>
> aka it is trying to use >2gig RAM and there is not enough memory.
> Possibly because you are not using a 64bit OS, and possibly because
> you don't actually have that much memory in your computer.
> Maybe try on a smaller dataset?
>
> > i also connnot use the i.class command on my windows
> > machine which is the platform i am working with.
>
> you will have to wait for someone to build GRASS 6.4.0RC6 for Cygwin.
> i.class uses UNIX-style Xmonitors which are not available on standard
> MS Windows. (or try GRASS on a Mac or Linux computer/virtual machine)
>
>
> Hamish
>
>
>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Mon, 22 Mar 2010 01:44:01 -0800 (PST)
> From: schorschli <matthiasoswald at hotmail.com>
> Subject: [GRASS-user] Re: make command (install add on)
> To: grass-user at lists.osgeo.org
> Message-ID: <1269251041185-4776893.post at n2.nabble.com>
> Content-Type: text/plain; charset=us-ascii
>
>
> Thanks for answering.
>
>
> >Are you sure about this directory?
>
> >MODULE_TOPDIR should point to the GRASS installation directory which
> >contains bin/, lib/ and other GRASS stuff.
>
>
> Yes, the directory is the one containing the grass-folders (bin/, lib/ and
> others).
>
> I could solve this problem. It was not a wrong MODULE_TOPDIR path, but
> wrong
> extensions for the makefiles.
>
>
>
> Now I can run the make command. But this is resulting in hunderts of errors
> and warning. Here is a printscreen of the first couple of lignes in the
> console...
>
> http://n2.nabble.com/file/n4776893/errors.png
> http://n2.nabble.com/file/n4776893/errors.png errors.png
>
>
> So maybe its better to just give it up with the addons...
>
>
>
> --
> View this message in context:
> http://n2.nabble.com/make-command-install-add-on-tp4764072p4776893.html
> Sent from the Grass - Users mailing list archive at Nabble.com.
>
>
> ------------------------------
>
> Message: 5
> Date: Mon, 22 Mar 2010 17:58:42 +0530
> From: Bishwarup Banerjee <bishwarup.banerjee at gmail.com>
> Subject: [GRASS-user] Helpp needed to call Grass from inside Python
> Plugin
> To: GRASS developers list <grass-dev at lists.osgeo.org>,
> grass-user at lists.osgeo.org
> Message-ID:
> <78e951a61003220528o10e648a6m2fbd3c878a2897a2 at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi All,
>
> I want to call the grass functionalities from inside my python plugins, in
> QGIS
> For example: the Grass's raster to polygon script, with out going inside
> the
> grass plugin.
> Can I set the Grass Mapset, and location from inside my python plugin?
> Is this possible?
> my configurations are:
> QGIS 0.11, GRASS 6.3, python 2.5, Windows
>
> Thank you in advance
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> ------------------------------
>
> Message: 6
> Date: Mon, 22 Mar 2010 03:10:42 -0800 (PST)
> From: Gary Nobles <garynobles at yahoo.com>
> Subject: [GRASS-user] grass editing
> To: grass-user at lists.osgeo.org
> Message-ID: <1269256242668-4777030.post at n2.nabble.com>
> Content-Type: text/plain; charset=us-ascii
>
>
> Hi, I have been editing a grass point dataset in qgis unfortunately I have
> just added 400 centroids rather than points! Is there anyway to delete just
> the centroids?
>
> Thanks
>
> Gary
> --
> View this message in context:
> http://n2.nabble.com/grass-editing-tp4777030p4777030.html
> Sent from the Grass - Users mailing list archive at Nabble.com.
>
>
> ------------------------------
>
> Message: 7
> Date: Mon, 22 Mar 2010 13:54:49 +0000
> From: Glynn Clements <glynn at gclements.plus.com>
> Subject: Re: [GRASS-user] ERROR: G_malloc: unable to allocate
> 2147483648 bytes at main.c:153
> To: Hamish <hamish_b at yahoo.com>
> Cc: grass-user at lists.osgeo.org, ikechinedu at gmail.com
> Message-ID: <19367.30377.130266.683319 at cerise.gclements.plus.com>
> Content-Type: text/plain; charset=us-ascii
>
>
> Hamish wrote:
>
> > > Hi, i am trying extract road network
> > > from a raster map but each time i run the image filter, i
> > > get this error message: ERROR: G_malloc: unable to allocate
> > > 2147483648 bytes at main.c:153.
> >
> > aka it is trying to use >2gig RAM and there is not enough memory.
> > Possibly because you are not using a 64bit OS, and possibly because
> > you don't actually have that much memory in your computer.
> > Maybe try on a smaller dataset?
>
> 2147483648 is exactly 2GiB; I'm wondering if that's the actual size
> (e.g. 16384 x 16384 x 8bytes/cell) or an uninitialised variable (e.g.
> initialised to INT_MIN in the code and not updated).
>
> On Linux, it is possible to allocate 2GiB on a 32-bit system, provided
> that there's a contiguous block (in practice, this means that the
> stack size isn't "unlimited"). You don't need that much physical RAM,
> only swap (although performance may be unacceptable if you're relying
> upon swap; it depends upon the access pattern).
>
> "Desktop" versions of Windows normally only allow 2GiB on 32-bit
> systems. Server versions allow up to 3GiB, and the desktop versions
> can be tweaked to allow it (but it isn't straightforward).
>
> > > i also connnot use the i.class command on my windows
> > > machine which is the platform i am working with.
> >
> > you will have to wait for someone to build GRASS 6.4.0RC6 for Cygwin.
> > i.class uses UNIX-style Xmonitors which are not available on standard
> > MS Windows. (or try GRASS on a Mac or Linux computer/virtual machine)
>
> I'll probably be building RC6 for Cygwin some time today.
>
> --
> Glynn Clements <glynn at gclements.plus.com>
>
>
> ------------------------------
>
> Message: 8
> Date: Mon, 22 Mar 2010 12:03:01 -0300
> From: Pablo Carreira <pablotcarreira at hotmail.com>
> Subject: [GRASS-user] Osgeo4W grass error
> To: <grass-user at lists.osgeo.org>
> Message-ID: <SNT114-W54FC77CFFE5D19331A6E4BD6270 at phx.gbl>
> Content-Type: text/plain; charset="utf-8"
>
>
> Hi, I'am trying to start the latest osgeo4w grass on windows 7 but I get an
> error when I select the dataset. Is it about the language? How can I start
> grass in english and not in portuguese?
>
> Regards,
> Pablo.
>
>
> Here is the error:
>
>
> C:\>"C:\OSGeo4W\apps\grass\grass-6.4.0svn"\etc\init.bat -wxpython access:
> Invalid argument
> ERRO:LOCAÃ├O << C:\teste/<UNKNOWN> >> indisponà vel
> Traceback (most recent call last):
> File "C:/OSGeo4W/apps/grass/grass-6.4.0svn/etc/wxpython/gis_set.py", line
> 853,
> in <module>
> GRASSStartUp = StartUp(0)
> File
> "C:\OSGeo4W\apps\Python25\lib\site-packages\wx-2.8-msw-unicode\wx\_core.p
> y", line 7935, in __init__
> self._BootstrapApp()
> File
> "C:\OSGeo4W\apps\Python25\lib\site-packages\wx-2.8-msw-unicode\wx\_core.p
> y", line 7509, in _BootstrapApp
> return _core_.PyApp__BootstrapApp(*args, **kwargs)
> File "C:/OSGeo4W/apps/grass/grass-6.4.0svn/etc/wxpython/gis_set.py", line
> 824,
> in OnInit
> StartUp = GRASSStartup()
> File "C:/OSGeo4W/apps/grass/grass-6.4.0svn/etc/wxpython/gis_set.py", line
> 165,
> in __init__
> self._set_properties()
> File "C:/OSGeo4W/apps/grass/grass-6.4.0svn/etc/wxpython/gis_set.py", line
> 206,
> in _set_properties
> self.OnSetDatabase(None)
> File "C:/OSGeo4W/apps/grass/grass-6.4.0svn/etc/wxpython/gis_set.py", line
> 664,
> in OnSetDatabase
> self.OnSelectLocation(None)
> File "C:/OSGeo4W/apps/grass/grass-6.4.0svn/etc/wxpython/gis_set.py", line
> 616,
> in OnSelectLocation
> self.listOfLocations[self.lblocations.GetSelection()]))
> File "C:/OSGeo4W/apps/grass/grass-6.4.0svn/etc/wxpython/gis_set.py", line
> 584,
> in UpdateMapsets
> stderr=None)
> File
> "C:\OSGeo4W\apps\grass\grass-6.4.0svn\etc\wxpython\gui_modules\gcmd.py",
> line 356, in __init__
> _("Error: ") + self.GetError()))
> File
> "C:\OSGeo4W\apps\grass\grass-6.4.0svn\etc\wxpython\gui_modules\gcmd.py",
> line 449, in GetError
> return unicode(msg, "utf-8")
> UnicodeDecodeError: 'utf8' codec can't decode bytes in position 4-5:
> invalid dat
> a
>
>
>
>
>
>
>
>
>
>
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> End of grass-user Digest, Vol 47, Issue 52
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