[Gdal-dev] GDALWARP & GCPs

[Reinaldo Escada Chohfi]

Frank,

Thanks for the prompt reply.
Up to 3rd order polynomial warp is fine for my application.

I'll take a look at gdalwarptest.

I have a few more questions now:

1. How can GCPs be supplied? Is there a write up on it?
2. How many GCPs can be provided?
3. Does the image need to be raw or will it work with .tif too?
4. Earlier write up on gdalwarp mentioned that it supported
     nearest neighbour resampling only.  Does it support bilinear
     or any other methods now?

Thanks,

Reinaldo

At 23:30 18-09-03 -0400, you wrote:
>Reinaldo Escada Chohfi wrote:
>>Hi GDAL Users,
>>I am planning to use the gdalwarp utility to
>>geo-reference a number of images in batch.
>>I would like to know before hand if it can be
>>utilized to warp (rectify) unprojected images.
>>That is, can it input raw images with GCPs
>>and output geo-referenced rectified (warped)
>>Geotiff images, given that it is also provided
>>proj, zone, ellps, etc?
>>Or it can only be used to reproject and warp
>>images that have already been rectified and are
>>geometrically correct in a particular projection?
>
>Reinaldo,
>
>First, I would advise you to use gdalwarptest, the new generation
>warper.
>
>Second, yes, it can rectify raw images, but it can be a bit tricky
>currently to supply the GCPs.  Also, currently only polynomial warps
>are supported when operating from GCPs, and only up to 3rd order.
>
>Best regards,
>--
>---------------------------------------+--------------------------------------
>I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
>light and sound - activate the windows | http://pobox.com/~warmerdam
>and watch the world go round - Rush    | Geospatial Programmer for Rent
>
>
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