Op 13-01-2021 om 16:48 schreef Lorenzo Di Giacomo:
Hello, i noticed that when i read an tiff image (using GeoTiffReader),
the GridCoverage2D has a GeneralEnvelope that is not precise.
Image extension: 6.9999999999999991,35.9999999999999929 :
18.0000000000000000,47.0000000000000000
Grid General Envelope: GeneralEnvelope[(6.999999999999999, 36.0),(18.0,
47.0)]
Why is this happening?
GeneralEnvelope uses a double array internally, see
https://github.com/geotools/geotools/blob/24e2b886c85f4f8878c9f437ce59e16eb4f1d124/modules/library/referencing/src/main/java/org/geotools/geometry/GeneralEnvelope.java#L71-L78
so it is never exact/precise, what you are seeing is how floating point
numbers behave in a computer.
And why only on the Latitude and not on longitude?
sheer luck I guess, it may be different when the weather changes.
BTW. your question is better suited for the GeoTools users list
<geotools-gt2-us...@lists.sourceforge.net>.
-
Mark
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