SQLITE/GPKG: add a gdal_get_pixel_value() SQL function. #6877
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Applies to both SQL SQLite dialect and GPKG
The ``gdal_get_pixel_value()`` function (added in GDAL 3.7) can be used to extract the value
of a pixel in a GDAL dataset. It requires the configuration option OGR_SQLITE_ALLOW_EXTERNAL_ACCESS
to be set to YES (for security reasons).
It takes 5 arguments:
* a string with the dataset name
* a band number (numbering starting at 1)
* a string being "georef" to indicate that subsequent values will be georeferenced
coordinates, or "pixel" to indicate that subsequent values will be in column, line
pixel space
* georeferenced X value or column number
* georeferenced Y value or line number
.. code-block::
SELECT gdal_get_pixel_value('../gcore/data/byte.tif', 1, 'georef', 440720, 3751320)
SELECT gdal_get_pixel_value('../gcore/data/byte.tif', 1, 'pixel', 0, 0)
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|
build-windows-conda failure is unrelated to this PR and related to conda-forge/xz-feedstock#31 |
nyalldawson
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Dec 9, 2022
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Applies to both SQL SQLite dialect and GPKG
The
gdal_get_pixel_value()function (added in GDAL 3.7) can be used to extract the value of a pixel in a GDAL dataset. It requires the configuration option OGR_SQLITE_ALLOW_EXTERNAL_ACCESS to be set to YES (for security reasons).It takes 5 arguments:
Example: