[GRASSLIST:8896] Re: orthorectification of Quickbird satellite images

[Ian MacMillan]

Dan, I am not sure about i.points3, but i.points and i.rectify does 
work.  I think you will still need a higher resolution DEM for your 
elevation correction (depending on the resolution you want for your 
satellite imagery).  Those are sometimes hard to obtain for large parts 
of the world.

Hope this helps,
Ian


On Nov 4, 2005, at 3:42 PM, Dan Gavin wrote:

>
> Hello all:
>
> I would like to orthorectify some high-resolution Quickbird images, 
> taken 20 degrees off-nadir.  They are in a mountainous region, and I 
> need fairly high positional accuracy.  While these images are 
> distributed as geoTIFFs, elevational distortions have not been removed 
> (their ortho product is based on a 90 meter DEM).  Searching the list 
> archives, I see a suggestion to use i.points3 and i.rectify3.  Are 
> these functions available in GRASS 6.1?  Any other suggestions, 
> including other software?
>
> Many thanks,
>
> Dan
>
> -- 
> Dan Gavin
> Research Associate
> University of Vermont
> Botany and Agricultural Biochemistry
> 120B Marsh Life Science
> 109 Carrigan Dr.
> Burlington, VT 05405-0086
>
>
 >
 >
What happens if a big asteroid hits Earth? Judging from realistic 
simulations involving a sledge hammer and a common laboratory frog, we 
can assume it will be pretty bad.
  - Dave Barry


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