[R-sig-Geo] georeferencing image from scratch

[Marcelo Kittlein]

Thank both of you Dominik and Loïc

alignExtent() did the job after regressing the wright points vs bad 
points and predicting a new correct extent. After setting the new 
extent, the points match correctly known features of the image.

I would give a try to gdalwarp to add GCPs to the dataset.


On 17/08/15 14:51, Dominik Schneider wrote:
> Marcelo,
> did you try alignExtent() in the raster package?
>
>
> Dominik Schneider
> o 303.735.6296 | c 518.956.3978
>
>
> On Mon, Aug 17, 2015 at 8:34 AM, Loïc Dutrieux <loic.dutrieux at wur.nl> wrote:
>
>> Hi Marcelo,
>>
>> I don't see anything in raster or rgdal that would do that directly.
>> However, this can be done I believe using gdal_translate / gdal_edit (for
>> adding the GCPs to the dataset) + gdalwarp (for warping). Both
>> gdal_translate and gdalwarp utilities have wrappers in the gdalUtils
>> package.
>>
>> Cheers,
>> Loïc Dutrieux
>>
>>
>> On 08/17/2015 11:43 AM, Marcelo Kittlein wrote:
>>
>>> Hi all
>>>
>>> I want to change a MSS landsat image which has bad georeferencing.
>>>
>>> I have a grid of points with correct georeferences and want to use them
>>> to reproject the image to a correct reference system.
>>>
>>> Is there some way to this in R using "raster" or other package?
>>>
>>> in idrisi I used to resample the image using a correspondence file
>>> (.cor) with xold yold xnew ynew values.
>>>
>>> I wonder if there is something similar I can do in R? Thanks in advance
>>>
>>> Marcelo Kittlein
>>>
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