Aha! That's the bit I hadn't found. Thank you! :) On Fri, Dec 10, 2021 at 10:38 AM Yann-Sebastien Tremblay-Johnston < [email protected]> wrote:
> Simon, > > See the Transformer API, in particular > https://gdal.org/api/gdal_alg.html?highlight=transformer#_CPPv419GDALTransformerFunc > (or gdal.Transformer in Python). > > Sebastien > > On Fri, Dec 10, 2021 at 10:24 AM Simon Eves <[email protected]> > wrote: > >> So we have a GeoTiFF of Sentinel-1 imagery which `gdalinfo` reports as >> having a GCP projection with 210 points, which we'd (perhaps naively?!) >> like to import directly, transforming to WGS84 on the fly. >> >> Obviously a simple OGRSpatialReference/OGRCoordinateTransformation >> transform isn't going to do anything, so I assume we have to do the GCP >> transform manually. >> >> I found the GCPCoordinateTransformation class and other supporting code >> in ogr2ogr_lib.cpp as used by gdaltransform, which seems to do what we >> need, but of course it's not in the core GDAL library so we can't "just use >> it". >> >> Before embarking on lifting out that code to implement an on-the-fly >> transformer in our system, I just wanted to make sure I wasn't missing any >> functionality elsewhere that would make it easier. >> >> It may also be more efficient to just kick off a gdalwarp to pre-convert >> the file so we can just import it with no transformation required, but that >> seems ugly unless it's gonna be WAY more efficient? >> >> Thanks, >> >> Simon >> >> -- >> <http://www.omnisci.com/> >> Simon Eves >> Senior Graphics Engineer, Rendering Group >> 100 Montgomery St (5th Floor), San Francisco, CA 94104, USA >> >> >> Email: [email protected] | Cell: +1 (415) 902-1996 >> >> _______________________________________________ >> gdal-dev mailing list >> [email protected] >> https://lists.osgeo.org/mailman/listinfo/gdal-dev >> > -- <http://www.omnisci.com/> Simon Eves Senior Graphics Engineer, Rendering Group 100 Montgomery St (5th Floor), San Francisco, CA 94104, USA Email: [email protected] | Cell: +1 (415) 902-1996
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