[GRASS-user] increase performance of i.ortho.photo/i.photo.rectify

GRASS GRASS user
1

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?

Any suggestions would be more than welcome!

Andras

2

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