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https://issues.apache.org/jira/browse/SOLR-7591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14558600#comment-14558600
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David Smiley commented on SOLR-7591:
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I was especially looking for the field type. You didn't quite articulate what
the problem was, but I'm figuring your expectation is that the cell size is
square (in degrees units, any way). Based on whatever your field type is
configured to be, the cells are apparently square for level 7 but not for level
6. I strongly suspect you are using a geohash tree. Geohash cells are
rectangles that alternate in orientation at each level. If you set
facet.heatmap.gridLevel=8 then I bet it would not be square, but if you did at
facet.heatmap.gridLevel=5 then it would be square. If you want square grid
cells, use a quad tree, set geo=false, and set the worldBounds to
ENVELOPE(-180, 180, 180, -180). When I get some time to finish up the new
"flex" tree, it'll be square by default and you could choose 16 or 64 cells, in
addition to the 4 option.
> Bug with heatmaps
> -----------------
>
> Key: SOLR-7591
> URL: https://issues.apache.org/jira/browse/SOLR-7591
> Project: Solr
> Issue Type: Bug
> Components: spatial
> Affects Versions: 5.1
> Reporter: Håvard Wahl Kongsgård
> Assignee: David Smiley
> Labels: heatmap
>
> Hi, I have been experimenting with the new heatmap facet in solr 5. When I
> use grid level 6 I notice a bug.
> with level 7, I get for example
> rows: 6
> cols: 26
> XmaX: 10.7514953613 Xmin 10.7157897949
> YmaX: 59.9317932129 Ymin 59.9235534668
> Cell size
> 0.00137329101562 x 0.00137329101562
> with level 6
> rows: 11
> cols: 26
> X maX: 10.8435058594 Xmin 10.5578613281
> Y maX: 59.9468994141 Ymin 59.8864746094
> Cell size
> 0.010986328125 x 0.0054931640625
> notice the cell size
> I could be that my code is faulty, but this works for all other grid levels
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