How to perform an affine transformation to a raster layer

corellana

Hi All,

I need to perform an affine transformation to a raster dem. To do this I have two control points with coordinates in two different systems. I tried with the "SHIFT - Transform Coordinates Based on File, but I'm not getting the expected results

Thanks in advance!

Criss

tikhpetr

Affine transformation requires 3+ GCPs in each GRS.

corellana

Hi thikhpetr, thanks for you answer, I'm able to add a third point, the issue is I can't make the txt work, I have used the following format:

// Shifting by inline GCPs

SHIFT_LAYER HAS_3D_POINTS=NO \

GCP="(X-2.88;Y-1.43),377028.26,2091960.50,377025.38,2091959.07" \

GCP="(X-1.67;Y-1.345),376481.54,2092765.57,376479.87,2092764.225" \

GCP="(X-0.46;Y-1.26),375934.82,2093570.64,375934.36,2093569.38"

I copied the format from the example in the help of Global Mapper, but for some reason, It doesn't work

Thanks in advance

Criss

tikhpetr

Hi, Corellana!

My English leaves much to be desired. Just like Swahili.)) That's why it's a cartoon.

Please note Error. This value must be <2!

corellana

Hey tikhpetr,

Thanks a lot for this. But, what I'm looking is to use "SHIFT - Transform Coordinates Based on File", see images below

But I'm looking to use this procedure as per the help file

What for some reason I ignore it is not working...

English is my second language too, much better in Spanish

Regards

Criss

tikhpetr

But I don't understand what the problem is?