[Qgis-user] Grid creation and export data to *.asc

[Carlos Cerdán]

Hi Luciano:

Although it is for another aplication, Maybe this link is useful for 
you: http://www.microchip.com/forums/m595269-print.aspx or, of course, 
you can try Google 
<http://www.google.com.pe/#hl=es-419&tbo=d&output=search&sclient=psy-ab&q=couldn%27t+reserve+space+for+cygwin%27s+heap+win32+error+487&oq=Couldn%27t+reserve+space+for+cygwin%27s+heap%2C+Win32&gs_l=hp.1.1.0i19l4.1464.1464.1.5781.1.1.0.0.0.0.164.164.0j1.1.0...0.0...1c.1.30mShnGqmQI&psj=1&bav=on.2,or.r_gc.r_pw.r_qf.&bvm=bv.1355534169,d.eWU&fp=9e0d642e130e27e9&bpcl=40096503&biw=1280&bih=858>.

Ubuntu <http://www.ubuntu.com/ubuntu> has not have this issue... maybe 
it's time to try it.

Regards

Carlos


El 26/12/12 13:03, Luciano La Sala escribió:
> Grid creation and export data to *.asc
>
> Hello again...!
>
> In doing as Micha advises I came across the following cryptic warning:
>
> Cannot start module r.out.xyz. command: 
> C:/OSGeo4W/apps/grass/GRASS-~1.2/bin/r.out.xyz.bat --interface-description
> 0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 
> 487 AllocationBase 0x0, BaseAddress 0x71110000, RegionSize 0x460000, 
> State 0x10000 C:\OSGeo4W\apps\msys\bin\sh.exe: *** Couldn't reserve 
> space for cygwin's heap, Win32 error 0
>
> If I go ahead a hit "run" I get the following output:
>
> r.out.xyz
>
> 0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487
>
> AllocationBase 0x0, BaseAddress 0x71110000, RegionSize 0x460000, State 
> 0x10000
>
> C:\OSGeo4W\apps\msys\bin\sh.exe: *** Couldn't reserve space for 
> cygwin's heap, Win32 error 0
>
> Finished with error
>
> I have no idea what the problem is this time. Any help will be more 
> than welcome.
>
> Thank you very much in advance.
>
> Luciano
>
> *De:*Micha Silver [mailto:micha at arava.co.il]
> *Enviado el:* Friday, December 21, 2012 2:30 PM
> *Para:* Luciano La Sala
> *CC:* qgis-user at lists.osgeo.org
> *Asunto:* Re: [Qgis-user] Grid creation and export data to *.asc
>
> Hi Luciano
>
> On 12/21/2012 5:30 PM, Luciano La Sala wrote:
>
>     Hello Folks,
>
>     Sorry to re-send but I got no response and I am not sure why.If my
>     question was not clear I can always rewrite it. Luciano
>
>     Hello QGIS users,
>
>     I have a raster image of human population counts (LandScan) of
>     approximately 1 km resolution. I need to take each cell of the
>     raster one by one and retrieve the population count for that cell.
>
>     To do this, I was told to create a grid theme of population
>     density - based on the grid themes specifying population counts
>     and area.
>
>     Export population count and population density files from ArcView
>     to *.asc files.
>
> Since your Landscan grid is at resolution 1 km, then the population 
> count and density (per sq km) should be the same.
>
> Using the GRASS module r.out.xyz you can get an ASCII text file with 
> three columns: X,Y,value. The X-Y are cell enters, and value would 
> represent Population count.
>
>     I am not sure how to create the grid nor how to export pop count
>     and density files to *.asc. Any tips? Thank you in advance!
>
>     Luciano La Sala
>
>
>
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>
>
>
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