Hi,
Unfortunately I could not get that to work. Any other suggestions? Cloud processing perhaps?
···
On Mon, Dec 18, 2017 at 8:00 PM, <grass-user-request@lists.osgeo.org> wrote:
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Today’s Topics:
- Re: Contours (Rich Shepard)
Message: 1
Date: Mon, 18 Dec 2017 09:38:16 -0800 (PST)
From: Rich Shepard <rshepard@appl-ecosys.com>
To: grass-user grass-user <grass-user@lists.osgeo.org>
Subject: Re: [GRASS-user] Contours
Message-ID:
<alpine.LNX.2.20.1712180935300.32060@salmo.appl-ecosys.com>
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On Mon, 18 Dec 2017, Shane Carey wrote:
I have a large DTM (5m cell size) and it covers an area of 100,000km2. I
need to create contours every 10meters in the dataset. If I tile the
dataset and contour each tile, the data, the contours act funny at the
edges, hence the need to process the area as one area. Is grass capable of
doing this?
Shane,
Yes. As long as you have sufficient memory and drive space. You can always
set the environment variable in ~/.bash_profile:
export=GRASS_VECTOR_LOWMEM=1
which will use available memory and not crash, while running more slowly.
If I’m wrong I’m sure we’ll both read about it. 
HTH,
Rich
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Le gach dea ghui,
Shane Carey
GIS and Data Solutions Consultant
Le gach dea ghui,
Shane Carey
GIS and Data Solutions Consultant
What happens? With 5 sq.m. pixels (that is your region setting?) and a DEM of 100,000 sq.km as you mentioned, then the DEM must contain around 100x10^9 sq.m or around 4x10^9 pixels. (4 billion pixels). That’s a lot… (You probably already did this calculation). So your DEM raster is probably some 15 GB ? You’ll need plenty of RAM.
···
On 12/19/2017 02:29 AM, Shane Carey wrote:
Hi,
Unfortunately I could not get that to work. Any other suggestions? Cloud processing perhaps?
On Luan 18 Noll 2017 at 20:17, Shane Carey <careyshan@gmail.com> wrote:
Super, thanks
On Mon, Dec 18, 2017 at 8:00 PM, <grass-user-request@lists.osgeo.org> wrote:
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Today’s Topics:
- Re: Contours (Rich Shepard)
Message: 1
Date: Mon, 18 Dec 2017 09:38:16 -0800 (PST)
From: Rich Shepard <rshepard@appl-ecosys.com>
To: grass-user grass-user <grass-user@lists.osgeo.org>
Subject: Re: [GRASS-user] Contours
Message-ID:
<alpine.LNX.2.20.1712180935300.32060@salmo.appl-ecosys.com>
Content-Type: text/plain; charset=US-ASCII; format=flowed
On Mon, 18 Dec 2017, Shane Carey wrote:
I have a large DTM (5m cell size) and it covers an area of 100,000km2. I
need to create contours every 10meters in the dataset. If I tile the
dataset and contour each tile, the data, the contours act funny at the
edges, hence the need to process the area as one area. Is grass capable of
doing this?
Shane,
Yes. As long as you have sufficient memory and drive space. You can always
set the environment variable in ~/.bash_profile:
export=GRASS_VECTOR_LOWMEM=1
which will use available memory and not crash, while running more slowly.
If I’m wrong I’m sure we’ll both read about it.
HTH,
Rich
Subject: Digest Footer
grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user
End of grass-user Digest, Vol 140, Issue 28
–
Le gach dea ghui,
Shane Carey
GIS and Data Solutions Consultant
–
Le gach dea ghui,
Shane Carey
GIS and Data Solutions Consultant
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