[Gdal-dev] gdalwarp/gcps and ERROR 1: Failed to compute polynomial equations of desired order

今天收集的另外几封通过gdal添加gcp并用gdalwarp进行变换的邮件。

Ethan Alpert ealpert at digitalglobe.com
Tue Sep 14 15:20:37 EDT 2004

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Greetings,


This is my first post. I tried searching around for examples but didn't


find much and mailman's search capability is non-existant.


So what's the secret for using more than 4 gcps with gdalwarp?


I have 3 pieces of imagery I'm mosaicing. I know the corners of each


image. I created a single non-projected tif of the three separate


images. I computed where (in pixel space) the top two corners of the


first two images are in the resulting tif and where the bottom two


corners of the last image are. This resulted in 6 GCP points. So I ran


the following:


gdal_translate  -gcp 0 0 56.7468972222222 29.4295138888889 -gcp 859 0


56.9820861111111 29.4210638888889 -gcp 0 1363 56.7391 29.1199027777778


-gcp 859 1363 56.9705611111111 29.1071416666667 -gcp 859 2171


56.9677027777778 28.9774388888889 -gcp -gcp 0 2171  56.7381583333333


28.9917333333333 mosaic.tif mosaic_raw.tif


Then I ran:


gdalwarp -co "TFW=YES" mosaic_raw.tif mosaic_new.tif


And got:


ERROR 1: Failed to compute polynomial equations of desired order


for provided control points.


If I use -order 1 I get a really screwing output.


If I remove the middle point and do:


gdal_translate  -gcp 0 0 56.7468972222222 29.4295138888889 -gcp 859 0


56.9820861111111 29.4210638888889 -gcp 859 2171 56.9677027777778


28.9774388888889 -gcp 0 2171  56.7381583333333 28.9917333333333


mosaic.tif mosaic_raw.tif


Then:


gdalwarp -co "TFW=YES" mosaic_raw.tif mosaic_new.tif


I get a projected mosiac of my images but it's not warped as I'd like.


So again my question is what needs to be done to use higher order


warping? What are the rules gcps must follow?


I'm using gdal1.2.1


Thanks in advance,


-ethan


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