jaksmid commented on issue #15748:
URL: https://github.com/apache/superset/issues/15748#issuecomment-884483524


   I checked what is coming from the backend and all values seem to be fine.
   
   I suspect the problem is in the rendering - the deck grid is probably 
performing aggregation of nearby locations using own metrics - 
https://deck.gl/docs/api-reference/aggregation-layers/grid-layer, section 
elevationAggregation.
   
   By default, a sum is used on the frontend aggregation.
   
   It could be non trivial to make sure the backend and frontend aggregations 
are in sync.


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