[GRASS-user] Automatic Orthorectification

Mauro Petrone petrone at planetek.it
Thu Mar 26 07:54:02 EDT 2009

I have this little chip (256x256px) that are taken from an 
orthorectified image, so I have all the coordinate for all them. I want 
to use this little image to orthorectify a new image. What are the right 
step for this?

Jachym Cepicky ha scritto:
> Hi,
> the GCPs are located in each image at known locations, you can create
> necessary files in a batch script:
>  - you have to create the group for each image (i.group)
>  - you have to set the target and ref files for the group (i.target)
>  - you have to create the POINTS file - manually
> try to rectify one image by hand and then see grassdata/LOCATION/MAPSET/group/GROUP/*
> however, if the position of GCPs is unknown to you, I'm affraid, you
> have to do it by hand
> jachym
> On Wed, Mar 25, 2009 at 03:04:43AM -0700, Petrone Orlando Mauro wrote:
>> Hi to all,
>> I'm trying to use GRASS 6.4 (installed on UBUNTU) to realize a system to automate the orthorectification process.
>> I have a group of little images (chip of 256x256 pixel) that I want to use to orthorectify an image.
>> Can grass use the little chip to create the RPC polynomial without any external action? I try i.points.auto, but I must set the GCP manually... 
>> Thank you
>> -- 
>> View this message in context: http://n2.nabble.com/Automatic-Orthorectification-tp2531561p2531561.html
>> Sent from the Grass - Users mailing list archive at Nabble.com.
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