[jira] [Created] (SEDONA-104) Bug in Reading Band Values of GeoTiff Images

["Kanchan Chowdhury (Jira)" <ji...@apache.org>]

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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