Hi, I did not have a close look into your ground control points but perhaps they are not very well distributed and therefore the default warping algorithm eats one corner of the image. Have a try with thin plate splin (-tps) instead. There may be some bug, it does not feel right that some source data are lost with default algorithm.
-Jukka Rahkonen- Lähettäjä: Hays Barrett <hays.barr...@gmail.com> Lähetetty: tiistai 30. maaliskuuta 2021 19.32 Vastaanottaja: Rahkonen Jukka (MML) <jukka.rahko...@maanmittauslaitos.fi> Kopio: gdal-dev@lists.osgeo.org Aihe: Re: [gdal-dev] Adding gcps to a raster using gdal_translate can result in data loss. I put together a page that better explains the issue and used one of the actual images from our project. https://haysbarrett.com/gdal_translate/ Thanks for looking into this for me. -Hays On Fri, Mar 26, 2021 at 2:59 PM jratike80 <jukka.rahko...@maanmittauslaitos.fi<mailto:jukka.rahko...@maanmittauslaitos.fi>> wrote: Hi, Please give an exact example. Preferably with a raster that can be created from command line with gdal_create followed by other required commands. Or alternatively Python code that re-produces the issue. -Jukka Rahkonen- Hays Barrett wrote > If the gcps stretch the image beyond the dimensions of the original raster > it appears to clip the data that sits outside of the original raster > dimensions rather than increase the raster dimensions to fit the stretched > data . > Is this the expected behavior? > If so is there a way to increase the dimensions of a raster so there is no > data loss? > Thanks, > -Hays > > _______________________________________________ > gdal-dev mailing list > gdal-dev@.osgeo<mailto:gdal-dev@.osgeo> > https://lists.osgeo.org/mailman/listinfo/gdal-dev -- Sent from: http://osgeo-org.1560.x6.nabble.com/GDAL-Dev-f3742093.html _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org<mailto:gdal-dev@lists.osgeo.org> https://lists.osgeo.org/mailman/listinfo/gdal-dev
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