Hello everybody, 
I'm trying do to an orthorectification on SAR Sentinels images using OTB. 
In order to make it more accurate, I want to use the application called 
RefineSensorModel. From what I've understood, this application uses 
matching points and creates a geom file which can be used for 
orthorectification. I've found some matching points and edited them in my 
.txt file but my question is : 
 
What is the format for this points in the .txt file ? In the OTB 
documentation I found row col lon lat, but is it enouth ?  
 
For exemple in my reference image the point (x1,y1,lon1,lat1) corresponds 
to (x2,y2,lon2,lat2) in the second image. How should I write this 
information in the .txt file ?  
 
#.txt file to geom file 
y1 x1 lon1 lat1 
y2 x2 lon2 lat2

Thank you.

Arthur

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