kanchanchy commented on code in PR #614:
URL: https://github.com/apache/incubator-sedona/pull/614#discussion_r855820003


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sql/src/main/scala/org/apache/spark/sql/sedona_sql/expressions/raster/Functions.scala:
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@@ -771,3 +771,45 @@ case class RS_Normalize(inputExpressions: Seq[Expression])
 }
 
 
+/// Append the Normalized Difference between two bands to the image array data 
as a new band

Review Comment:
   Yes, I agree with both points. Users can calculate the normalized difference 
using RS_NormalizedDifference operator and then pass the normalized difference 
to RS_AppendBand to complete the full requirement. Also, if all RS operator are 
specific to bands, then Band postfix is not required.



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