Changeset 4285 in josm for trunk/src/org/openstreetmap/josm/data/projection/Ellipsoid.java

Timestamp:

2011-08-07T12:17:39+02:00 (13 years ago)

Author:

bastiK

Message:

major projection rework

More modular structure, inspired by Proj.4.

There are almost no semantic changes to the projection algorithms. Mostly factors of 'a' and 180/PI have been moved from one place to the other. In UTM_France_DOM, the ellipsoid conversion for the first 3 projections has been changed from hayford <-> GRS80 to hayford <-> WGS84.

Some redundant algorithms have been removed. In particular:

• UTM_France_DOM used to have its own Transverse Mercator implementation. It is different from the implementation in TransverseMercator.java as it has another series expansion. For EPSG::2975, there are numeric differences on centimeter scale. However, the new data fits better with Proj.4 output.
• Also removed are alternate implementations of LambertConformalConic. (They are all quite similar, though.)

File:

• trunk/src/org/openstreetmap/josm/data/projection/Ellipsoid.java (modified) (1 diff)

trunk/src/org/openstreetmap/josm/data/projection/Ellipsoid.java

@@ -19 +19 @@
     public static final Ellipsoid clarke = new Ellipsoid(6378249.2, 6356515.0);
     /**
-     * Hayford's ellipsoid (ED50 system)
+     * Hayford's ellipsoid 1909 (ED50 system)
+     * Proj.4 code: intl
      */
     public static final Ellipsoid hayford =