001    //License: GPL. For details, see LICENSE file.
002    package org.openstreetmap.josm.data.projection;
003    
004    import static org.openstreetmap.josm.tools.I18n.tr;
005    
006    import org.openstreetmap.josm.data.Bounds;
007    import org.openstreetmap.josm.data.coor.LatLon;
008    import org.openstreetmap.josm.data.projection.datum.ThreeParameterDatum;
009    import org.openstreetmap.josm.data.projection.proj.ProjParameters;
010    import org.openstreetmap.josm.data.projection.proj.SwissObliqueMercator;
011    
012    /**
013     * SwissGrid CH1903 / L03, see http://de.wikipedia.org/wiki/Swiss_Grid.
014     *
015     * Actually, what we have here, is CH1903+ (EPSG:2056), but without
016     * the additional false easting of 2000km and false northing 1000 km.
017     *
018     * To get to CH1903, a shift file is required. So currently, there are errors
019     * up to 1.6m (depending on the location).
020     *
021     * This projection does not have any parameters, it only implements
022     * ProjectionSubPrefs to show a warning that the grid file correction is not done.
023     */
024    public class SwissGrid extends AbstractProjection {
025    
026        public SwissGrid() {
027            ellps = Ellipsoid.Bessel1841;
028            datum = new ThreeParameterDatum("SwissGrid Datum", null, ellps, 674.374, 15.056, 405.346);
029            x_0 = 600000;
030            y_0 = 200000;
031            lon_0 = 7.0 + 26.0/60 + 22.50/3600;
032            proj = new SwissObliqueMercator();
033            try {
034                proj.initialize(new ProjParameters() {{
035                    ellps = SwissGrid.this.ellps;
036                    lat_0 = 46.0 + 57.0/60 + 8.66/3600;
037                }});
038            } catch (ProjectionConfigurationException e) {
039                throw new RuntimeException(e);
040            }
041        }
042    
043        @Override
044        public String toString() {
045            return tr("Swiss Grid (Switzerland)");
046        }
047    
048        @Override
049        public Integer getEpsgCode() {
050            return 21781;
051        }
052    
053        @Override
054        public int hashCode() {
055            return getClass().getName().hashCode(); // we have no variables
056        }
057    
058        @Override
059        public String getCacheDirectoryName() {
060            return "swissgrid";
061        }
062    
063        @Override
064        public Bounds getWorldBoundsLatLon() {
065            return new Bounds(new LatLon(45.7, 5.7), new LatLon(47.9, 10.6), false);
066        }
067    
068    }