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Date: Thu, 26 Nov 2009 13:43:39 +0000 (UTC)
From: "Chris Male (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [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=3Dcom.atlassia=
n.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D127=
82896#action_12782896 ]=20

Chris Male commented on LUCENE-1930:
------------------------------------

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 =3D projector.coords(latitude, longitude);
>   double id =3D getBoxId(coords[0]) + (getBoxId(coords[1]) / tierVertical=
PosDivider);
>   return id ;
> }
> private double getBoxId (double coord){
>   return Math.floor(coord / (idd / this.tierLength));
> }
> with
> Double idd =3D new Double(180);
> in the CartesianTierPlotter constructor.
> But current Sinusoidal Projector set and used in initialisation of Cartes=
ianTierPlotter does :
> public double[] coords(double latitude, double longitude) {
>   double rlat =3D Math.toRadians(latitude);
>   double rlong =3D Math.toRadians(longitude);
>   double nlat =3D rlong * Math.cos(rlat);
>   double r[] =3D {nlat, rlong};
> return r;
> }
> Thus we moderate with idd =3D 180 a coord that is in a Radian space.
> Things to do :
> 1=C2=B0) fix idd to : double idd=3D PI;
> 2=C2=B0) Move idd definition to IProjector interface : The coord space sh=
ould belong to the projector doing the job. Change the code from CTP to use=
 that new interface.

--=20
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