Re: [GRASS-user] grass-user Digest, Vol 140, Issue 28

Micha Silver Fri, 22 Dec 2017 03:04:53 -0800

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?

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 Luan 18 Noll 2017 at 20:17, Shane Carey <[email protected]> wrote:

Super, thanks

On Mon, Dec 18, 2017 at 8:00 PM, <[email protected]> wrote:

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Today's Topics:

1. Re: Contours (Rich Shepard)

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Message: 1
Date: Mon, 18 Dec 2017 09:38:16 -0800 (PST)
From: Rich Shepard <[email protected]>
To: grass-user grass-user <[email protected]>
Subject: Re: [GRASS-user] Contours
Message-ID:
<[email protected]>
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

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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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-- 
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918

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Re: [GRASS-user] grass-user Digest, Vol 140, Issue 28

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