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Nov 26, 2009, 5:43 AM
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[jira] Commented: (LUCENE-1930) Scale moderator not in line with sinusoidal projector
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[ https://issues.apache.org/jira/browse/LUCENE-1930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12782896#action_12782896 ]
Chris Male commented on LUCENE-1930:
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Hi Nicolas,
I have every intention to commit my work to Lucene in the next week or so. If you can wait till then, I will include this patch in my patch.
Thanks
> Scale moderator not in line with sinusoidal projector
> -----------------------------------------------------
>
> Key: LUCENE-1930
> URL: https://issues.apache.org/jira/browse/LUCENE-1930
> Project: Lucene - Java
> Issue Type: Bug
> Components: contrib/spatial
> Affects Versions: 2.9
> Reporter: Nicolas Helleringer
> Attachments: LUCENE-1930.patch
>
>
> Current implementation in spatial Lucene does :
> public double getTierBoxId (double latitude, double longitude) {
> double[] coords = projector.coords(latitude, longitude);
> double id = getBoxId(coords[0]) + (getBoxId(coords[1]) / tierVerticalPosDivider);
> return id ;
> }
> private double getBoxId (double coord){
> return Math.floor(coord / (idd / this.tierLength));
> }
> with
> Double idd = new Double(180);
> in the CartesianTierPlotter constructor.
> But current Sinusoidal Projector set and used in initialisation of CartesianTierPlotter does :
> public double[] coords(double latitude, double longitude) {
> double rlat = Math.toRadians(latitude);
> double rlong = Math.toRadians(longitude);
> double nlat = rlong * Math.cos(rlat);
> double r[] = {nlat, rlong};
> return r;
> }
> Thus we moderate with idd = 180 a coord that is in a Radian space.
> Things to do :
> 1°) fix idd to : double idd= PI;
> 2°) Move idd definition to IProjector interface : The coord space should belong to the projector doing the job. Change the code from CTP to use that new interface.
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