Satelite image - i.ortho.photo

GRASS GRASS user
1

Hi,

   I'm new user of grass so I would like to ask whether is possible to
use i.ortho.photo routine to ortho-rectifying satelite image. I don't
have a camera reference points and parameters of camera.

Thank you very much.
Ivan Pobis

2

On Wed, Oct 04, 2000 at 05:23:58PM +0100, Ivan Pobis wrote:

Hi,

   I'm new user of grass so I would like to ask whether is possible to
use i.ortho.photo routine to ortho-rectifying satelite image. I don't
have a camera reference points and parameters of camera.

You might look at i.rectify[2|3] and i.points or i.vpoints for setting
up control points. Relief displacement shouldn't be much of an issue
with satellite imagery, so the DEM and focal length corrections probably
aren't necessary.

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/bin/sh ~/.signature:
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3

Hallo Eric,

You might look at i.rectify[2|3] and i.points or i.vpoints for setting
up control points. Relief displacement shouldn't be much of an issue
with satellite imagery, so the DEM and focal length corrections
probably aren't necessary.

Thank you very much for your answer. I think I need to use DEM and
focal lennght correction, because the distances of elevation on valleys
are very high. The lowest point on valley is etc. 600 meters and higest
1900 meters so the image of satellite is too out of focus.
I don't know if it's possible to use empty data of camera parameters
although I need to use control points of satellite image and map cover
to rectifying image too.

Ivan Pobis