The bbox is created using the xmin,ymin,xmax,ymax found in the geometry.
Assuming every pixel can be represented as a geometry, that's your bbox.
On 5/3/24 13:18, Simon Eves via gdal-dev wrote:
Yes, but that's just the corners.
Consider, say, a raster that contains a satellite sweep which is not
axis-aligned but forms a "windshield wiper" shape in lon/lat space. The
bounding box of ALL the pixels is not just the bounding box of the corners.
On Fri, May 3, 2024 at 1:09 PM Javier Jimenez Shaw <j...@jimenezshaw.com
<mailto:j...@jimenezshaw.com>> wrote:
Maybe I don't understand your question, but in gdalinfo you have the
four corners as lat-lon
On Fri, 3 May 2024, 21:46 Simon Eves via gdal-dev,
<gdal-dev@lists.osgeo.org <mailto:gdal-dev@lists.osgeo.org>> wrote:
So we are trying to optimize our raster import process, and
particularly the steps to derive the final WGS84/4326 bounding
box for a raster file or tile thereof.
Obviously in the general case, the transform is from integer
pixel coordinate through the Affine Transformation matrix and
then whatever OGRCoordinateTransformation is required to get to
WGS84/4326, and perhaps a GCP-based mesh transformation too.
Currently we are deriving the bounding box by passing all pixels
of the four edges of the file/tile through the full transform,
except in the simple Affine-only case where we just transform
the four corners.
Is there any shortcut API provided by GDAL or PROJ to allow the
bounding box to be computed (or at least safely over-estimated)
in the general case? I'm assuming that even a non-GCP
OGRCT could still be non-linear such that just transforming the
corners is insufficient.
Thanks in advance,
Simon
--
Simon Eves
Senior Rendering Engineer
+1 (415) 902-1996
simon.e...@heavy.ai <mailto:simon.e...@heavy.ai>
<http://www.heavy.ai>
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