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List:       grass-user
Subject:    Re: [GRASS-user] increase performance of i.ortho.photo/i.photo.rectify
From:       Markus Metz <markus.metz.giswork () googlemail ! com>
Date:       2011-05-29 9:17:20
Message-ID: BANLkTi=LpoYRzBRS0H-ox9KZNydFccFB6Q () mail ! gmail ! com
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On Thu, May 26, 2011 at 12:37 PM, Andras Balazs <andras.balazs@metla.fi> wrote:
> Hi,
>
> I am orthorectifying 3 channel aerial photographs using i.ortho.photo (GRASS
> 6.4.1, Ubuntu 10.04 64bit, dual core (each 3 GHz), 4 GB RAM).
> I'm new to GRASS so no clue whether it's possible to make the rectification
> process to use the computer's resources  better. i.photo.rectify is using at
> most 30% CPU, processing of one channel takes about 15-20 minutes. I suppose
> it would be much faster if it would use one core running at 100%.
> Is there an optimal amount of memory that should be assigned to the process
> or the more the better?

i.photo.rectify has been overhauled only recently for 6.4.2: the
module is now faster and the results are more accurate. If possible,
upgrade to GRASS 6.4.2. With regard to memory, yes, the more the
better.

Markus M
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