Kanchan Chowdhury created SEDONA-104:
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Summary: Bug in Reading Band Values of GeoTiff Images
Key: SEDONA-104
URL: https://issues.apache.org/jira/browse/SEDONA-104
Project: Apache Sedona
Issue Type: Bug
Affects Versions: 1.1.1
Reporter: Kanchan Chowdhury
In line 182 of the file
[GeotiffSchema.scala|[https://github.com/apache/incubator-sedona/blob/master/sql/src/main/scala/org/apache/spark/sql/sedona_sql/io/GeotiffSchema.scala],]
it is calculating the offset position of a pixel band value. The offset
calculation is wrong. The correct offset should be:
val offset = i * width + j + width * height * bandId
I compared the band values returned by Apache Sedona with the band values
returned by Python
[rasterio|https://rasterio.readthedocs.io/en/latest/index.html] library for the
same geotiff image. If the offset values are calculated following the above
formula, band values returned by Apache Sedona match with the band values
returned by rasterio librray.
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