1 | //License: GPL. For details, see LICENSE file.
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2 | //Thanks to Johan Montagnat and its geoconv java converter application
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3 | //(http://www.i3s.unice.fr/~johan/gps/ , published under GPL license)
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4 | //from which some code and constants have been reused here.
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5 | package org.openstreetmap.josm.data.projection;
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6 |
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7 | import static org.openstreetmap.josm.tools.I18n.tr;
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8 |
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9 | import org.openstreetmap.josm.data.coor.EastNorth;
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10 | import org.openstreetmap.josm.data.coor.LatLon;
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11 |
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12 | public class LambertEST implements Projection {
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13 |
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14 | public static final double ef = 500000; //Easting at false origin = 5000000 m
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15 | public static final double nf = 6375000; //Northing at false origin = 6375000 m
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16 | public static final double lat1 = Math.toRadians(59 + 1.0/3.0); //Latitude of 1st standard parallel = 59o20`0`` N
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17 | public static final double lat2 = Math.toRadians( 58);//Latitude of 2nd standard parallel = 58o0`0`` N
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18 | public static final double latf = Math.toRadians(57.517553930555555555555555555556);//'Latitude of false origin = 57o31`3,19415`` N
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19 | public static final double lonf = Math.toRadians( 24.0);
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20 | public static final double a = 6378137;
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21 | public static final double ee = 0.081819191042815792;
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22 | public static final double m1 = Math.cos(lat1) / (Math.sqrt(1 - ee *ee * Math.pow(Math.sin(lat1), 2)));
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23 | public static final double m2 = Math.cos(lat2) / (Math.sqrt(1 - ee *ee * Math.pow(Math.sin(lat2), 2)));
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24 | public static final double t1 = Math.tan(Math.PI / 4.0 - lat1 / 2.0) / Math.pow(( (1.0 - ee * Math.sin(lat1)) / (1.0 + ee * Math.sin(lat1))) ,(ee / 2.0));
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25 | public static final double t2 = Math.tan(Math.PI / 4.0 - lat2 / 2.0) / Math.pow(( (1.0 - ee * Math.sin(lat2)) / (1.0 + ee * Math.sin(lat2))) ,(ee / 2.0));
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26 | public static final double tf = Math.tan(Math.PI / 4.0 - latf / 2.0) / Math.pow(( (1.0 - ee * Math.sin(latf)) / (1.0 + ee * Math.sin(latf))) ,(ee / 2.0));
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27 | public static final double n = (Math.log(m1) - Math.log(m2)) / (Math.log(t1) - Math.log(t2));
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28 | public static final double f = m1 / (n * Math.pow(t1, n));
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29 | public static final double rf = a * f * Math.pow(tf, n);
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30 |
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31 | // /**
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32 | // * precision in iterative schema
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33 | // */
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34 | //
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35 | public static final double epsilon = 1e-11;
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36 |
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37 | /**
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38 | * @param p WGS84 lat/lon (ellipsoid GRS80) (in degree)
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39 | * @return eastnorth projection in Lambert Zone (ellipsoid GRS80)
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40 | */
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41 | public EastNorth latlon2eastNorth(LatLon p)
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42 | {
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43 |
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44 | double t = Math.tan(Math.PI / 4.0 - Math.toRadians(p.lat()) / 2.0) / Math.pow(( (1.0 - ee * Math.sin(Math.toRadians(p.lat()))) / (1.0 + ee * Math.sin(Math.toRadians(p.lat())))) ,(ee / 2.0));
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45 | double r = a * f * Math.pow(t, n);
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46 | double theta = n * (Math.toRadians(p.lon()) - lonf);
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47 |
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48 | double x = ef + r * Math.sin(theta); //587446.7
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49 | double y = nf + rf - r * Math.cos(theta); //6485401.6
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50 |
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51 | return new EastNorth(x,y);
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52 | }
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53 |
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54 | public static double IterateAngle(double e, double t)
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55 | {
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56 | double a1 = 0.0;
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57 | double a2 = 3.1415926535897931;
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58 | double a = 1.5707963267948966;
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59 | double b = 1.5707963267948966 - (2.0 * Math.atan(t * Math.pow((1.0 - (e * Math.sin(a))) / (1.0 + (e * Math.sin(a))), e / 2.0)));
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60 | while (Math.abs(a-b) > epsilon)
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61 | {
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62 | a = a1 + ((a2 - a1) / 2.0);
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63 | b = 1.5707963267948966 - (2.0 * Math.atan(t * Math.pow((1.0 - (e * Math.sin(a))) / (1.0 + (e * Math.sin(a))), e / 2.0)));
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64 | if (a1 == a2)
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65 | {
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66 | return 0.0;
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67 | }
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68 | if (b > a)
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69 | a1 = a;
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70 | else
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71 | a2 = a;
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72 | }
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73 | return b;
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74 | }
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75 | public LatLon eastNorth2latlon(EastNorth p)
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76 | {
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77 | double r = Math.sqrt(Math.pow((p.getX() - ef), 2.0) + Math.pow((rf - p.getY() + nf), 2.0) ) * Math.signum(n);
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78 | double T = Math.pow((r / (a * f)), (1.0/ n)) ;
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79 | double theta = Math.atan((p.getX() - ef) / (rf - p.getY() + nf));
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80 | double y = (theta / n + lonf) ;
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81 | double x = (IterateAngle(ee, T)) ;
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82 | return new LatLon(Math.toDegrees(x),Math.toDegrees(y));
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83 | }
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84 |
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85 | @Override public String toString() {
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86 | return tr("Lambert Zone (Estonia)");
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87 | }
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88 |
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89 | public String getCacheDirectoryName() {
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90 | return "lambertest";
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91 | }
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92 |
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93 | public double scaleFactor() {
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94 | return 1.0 / 360;
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95 | }
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96 |
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97 | @Override
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98 | public boolean equals(Object o) {
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99 | return o instanceof LambertEST;
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100 | }
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101 |
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102 | @Override
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103 | public int hashCode() {
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104 | return LambertEST.class.hashCode();
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105 | }
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106 | }
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