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Posted to dev@sedona.apache.org by "JimShady (via GitHub)" <gi...@apache.org> on 2024/04/03 11:37:41 UTC
[I] Suggested edit to documentation [sedona]
JimShady opened a new issue, #1314:
URL: https://github.com/apache/sedona/issues/1314
https://sedona.apache.org/1.5.1/api/sql/Raster-loader/#rs_makeemptyraster
When making a global raster using, for example, WGS84, the pixel size on the y axis should be specified as a negative number. I think this is a 'gotcha' and should be explicitly explained?
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Re: [I] Suggested edit to documentation [sedona]
Posted by "jiayuasu (via GitHub)" <gi...@apache.org>.
jiayuasu commented on issue #1314:
URL: https://github.com/apache/sedona/issues/1314#issuecomment-2042020922
@Kontinuation Do you know why the pixel size on Y (scaleY) can be negative?
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Re: [I] Suggested edit to documentation [sedona]
Posted by "Kontinuation (via GitHub)" <gi...@apache.org>.
Kontinuation commented on issue #1314:
URL: https://github.com/apache/sedona/issues/1314#issuecomment-2042100286
The pixels with lower Y grid/pixel coordinate is mapped to larger Y value of map coordinate, so a negative scaleY indicates a north-up image, which is the most common case.
`scaley` is actually an element of the affine transformation matrix, it should not be treated as the pixel size. So yes, the documentation is quite misleading.
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Re: [I] Suggested edit to documentation [sedona]
Posted by "jiayuasu (via GitHub)" <gi...@apache.org>.
jiayuasu closed issue #1314: Suggested edit to documentation
URL: https://github.com/apache/sedona/issues/1314
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