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ASF subversion and git services commented on SOLR-7005: ------------------------------------------------------- Commit 1658614 from [~dsmiley] in branch 'dev/trunk' [ https://svn.apache.org/r1658614 ] SOLR-7005: New facet.heatmap on spatial RPT fields > facet.heatmap for spatial heatmap faceting on RPT > ------------------------------------------------- > > Key: SOLR-7005 > URL: https://issues.apache.org/jira/browse/SOLR-7005 > Project: Solr > Issue Type: New Feature > Components: spatial > Reporter: David Smiley > Assignee: David Smiley > Fix For: 5.1 > > Attachments: SOLR-7005_heatmap.patch, SOLR-7005_heatmap.patch, > SOLR-7005_heatmap.patch, SOLR-7005_heatmap.patch, heatmap_512x256.png, > heatmap_64x32.png > > > This is a new feature that uses the new spatial Heatmap / 2D PrefixTree cell > counter in Lucene spatial LUCENE-6191. This is a form of faceting, and > as-such I think it should live in the "facet" parameter namespace. Here's > what the parameters are: > * facet=true > * facet.heatmap=fieldname > * facet.heatmap.bbox=\["-180 -90" TO "180 90"] > * facet.heatmap.gridLevel=6 > * facet.heatmap.distErrPct=0.10 > Like other faceting features, the fieldName can have local-params to exclude > filter queries or specify an output key. > The bbox is optional; you get the whole world or you can specify a box or > actually any shape that WKT supports (you get the bounding box of whatever > you put). > Ultimately, this feature needs to know the grid level, which together with > the input shape will yield a certain number of cells. You can specify > gridLevel exactly, or don't and instead provide distErrPct which is computed > like it is for the RPT field type as seen in the schema. 0.10 yielded ~4k > cells but it'll vary. There's also a facet.heatmap.maxCells safety net > defaulting to 100k. Exceed this and you get an error. > The output is (JSON): > {noformat} > {gridLevel=6,columns=64,rows=64,minX=-180.0,maxX=180.0,minY=-90.0,maxY=90.0,counts=[[0, > 0, 2, 1, ....],[1, 1, 3, 2, ...],...]} > {noformat} > counts is null if all would be 0. Perhaps individual row arrays should > likewise be null... I welcome feedback. > I'm toying with an output format option in which you can specify a base-64'ed > grayscale PNG. > Obviously this should support sharded / distributed environments. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org