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

["Jia Yu (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SEDONA-104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17518512#comment-17518512 ] 

Jia Yu commented on SEDONA-104:
-------------------------------

[~kanchanchy] Thanks for capturing this. Can you make a PR to fix it? This will be really helpful.

> 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
>            Priority: Critical
>              Labels: test
>
> 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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