1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data.projection;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.tr;
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5 |
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6 | import java.awt.GridBagLayout;
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7 | import java.io.IOException;
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8 | import java.io.InputStream;
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9 | import java.util.Collection;
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10 | import java.util.Collections;
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11 |
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12 | import javax.swing.JComboBox;
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13 | import javax.swing.JLabel;
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14 | import javax.swing.JPanel;
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15 |
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16 | import org.openstreetmap.josm.Main;
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17 | import org.openstreetmap.josm.data.Bounds;
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18 | import org.openstreetmap.josm.data.coor.EastNorth;
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19 | import org.openstreetmap.josm.data.coor.LatLon;
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20 | import org.openstreetmap.josm.tools.GBC;
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21 | import org.openstreetmap.josm.tools.ImageProvider;
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22 |
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23 | /**
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24 | * This class provides the two methods <code>latlon2eastNorth</code> and <code>eastNorth2latlon</code>
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25 | * converting the JOSM LatLon coordinates in WGS84 system (GPS) to and from East North values in
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26 | * the projection Lambert conic conform 4 zones using the French geodetic system NTF.
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27 | * This newer version uses the grid translation NTF<->RGF93 provided by IGN for a submillimetric accuracy.
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28 | * (RGF93 is the French geodetic system similar to WGS84 but not mathematically equal)
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29 | * @author Pieren
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30 | */
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31 | public class Lambert implements Projection, ProjectionSubPrefs {
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32 | /**
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33 | * Lambert I, II, III, and IV projection exponents
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34 | */
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35 | public static final double n[] = { 0.7604059656, 0.7289686274, 0.6959127966, 0.6712679322 };
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36 |
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37 | /**
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38 | * Lambert I, II, III, and IV projection constants
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39 | */
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40 | public static final double c[] = { 11603796.98, 11745793.39, 11947992.52, 12136281.99 };
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41 |
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42 | /**
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43 | * Lambert I, II, III, and IV false east
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44 | */
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45 | public static final double Xs[] = { 600000.0, 600000.0, 600000.0, 234.358 };
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46 |
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47 | /**
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48 | * Lambert I, II, III, and IV false north
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49 | */
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50 | public static final double Ys[] = { 5657616.674, 6199695.768, 6791905.085, 7239161.542 };
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51 |
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52 | /**
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53 | * Lambert I, II, III, and IV longitudinal offset to Greenwich meridian
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54 | */
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55 | public static final double lg0 = 0.04079234433198; // 2deg20'14.025"
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56 |
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57 | /**
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58 | * precision in iterative schema
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59 | */
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60 |
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61 | public static final double epsilon = 1e-11;
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62 |
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63 | /**
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64 | * France is divided in 4 Lambert projection zones (1,2,3 + 4th for Corsica)
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65 | */
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66 | public static final double cMaxLatZone1Radian = Math.toRadians(57 * 0.9);
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67 | public static final double cMinLatZone1Radian = Math.toRadians(46.1 * 0.9);// lowest latitude of Zone 4 (South Corsica)
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68 |
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69 | public static final double zoneLimitsDegree[][] = {
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70 | {Math.toDegrees(cMaxLatZone1Radian), (53.5 * 0.9)}, // Zone 1 (reference values in grad *0.9)
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71 | {(53.5 * 0.9), (50.5 * 0.9)}, // Zone 2
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72 | {(50.5 * 0.9), (47.0 * 0.9)}, // Zone 3
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73 | {(47.51963 * 0.9), Math.toDegrees(cMinLatZone1Radian)} // Zone 4
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74 | };
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75 |
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76 | public static final double cMinLonZonesRadian = Math.toRadians(-4.9074074074074059 * 0.9);
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77 |
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78 | public static final double cMaxLonZonesRadian = Math.toRadians(10.2 * 0.9);
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79 |
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80 | /**
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81 | * Allow some extension beyond the theoretical limits
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82 | */
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83 | public static final double cMaxOverlappingZonesDegree = 1.5;
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84 |
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85 | public static final int DEFAULT_ZONE = 0;
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86 |
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87 | private int layoutZone = DEFAULT_ZONE;
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88 |
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89 | private static NTV2GridShiftFile ntf_rgf93Grid = null;
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90 |
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91 | public static NTV2GridShiftFile getNtf_rgf93Grid() {
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92 | return ntf_rgf93Grid;
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93 | }
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94 |
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95 | public Lambert() {
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96 | if (ntf_rgf93Grid == null) {
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97 | try {
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98 | String gridFileName = "ntf_r93_b.gsb";
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99 | InputStream is = Main.class.getResourceAsStream("/data/"+gridFileName);
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100 | if (is == null) {
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101 | System.err.println(tr("Warning: failed to open input stream for resource ''/data/{0}''. Cannot load NTF<->RGF93 grid", gridFileName));
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102 | return;
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103 | }
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104 | ntf_rgf93Grid = new NTV2GridShiftFile();
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105 | ntf_rgf93Grid.loadGridShiftFile(is, false);
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106 | //System.out.println("NTF<->RGF93 grid loaded.");
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107 | } catch (Exception e) {
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108 | e.printStackTrace();
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109 | }
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110 | }
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111 | }
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112 |
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113 | /**
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114 | * @param p WGS84 lat/lon (ellipsoid GRS80) (in degree)
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115 | * @return eastnorth projection in Lambert Zone (ellipsoid Clark)
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116 | * @throws IOException
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117 | */
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118 | public EastNorth latlon2eastNorth(LatLon p) {
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119 | // translate ellipsoid GRS80 (WGS83) => Clark
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120 | LatLon geo = WGS84_to_NTF(p);
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121 | double lt = Math.toRadians(geo.lat()); // in radian
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122 | double lg = Math.toRadians(geo.lon());
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123 |
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124 | // check if longitude and latitude are inside the French Lambert zones
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125 | if (lt >= cMinLatZone1Radian && lt <= cMaxLatZone1Radian && lg >= cMinLonZonesRadian && lg <= cMaxLonZonesRadian)
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126 | return ConicProjection(lt, lg, Xs[layoutZone], Ys[layoutZone], c[layoutZone], n[layoutZone]);
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127 | return ConicProjection(lt, lg, Xs[0], Ys[0], c[0], n[0]);
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128 | }
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129 |
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130 | public LatLon eastNorth2latlon(EastNorth p) {
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131 | LatLon geo;
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132 | geo = Geographic(p, Xs[layoutZone], Ys[layoutZone], c[layoutZone], n[layoutZone]);
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133 | // translate geodetic system from NTF (ellipsoid Clark) to RGF93/WGS84 (ellipsoid GRS80)
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134 | return NTF_to_WGS84(geo);
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135 | }
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136 |
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137 | @Override public String toString() {
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138 | return tr("Lambert 4 Zones (France)");
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139 | }
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140 |
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141 | public String toCode() {
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142 | return "EPSG:"+(27561+layoutZone);
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143 | }
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144 |
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145 | @Override
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146 | public int hashCode() {
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147 | return getClass().getName().hashCode()+layoutZone; // our only real variable
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148 | }
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149 |
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150 | public String getCacheDirectoryName() {
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151 | return "lambert";
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152 | }
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153 |
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154 | /**
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155 | * Initializes from geographic coordinates. Note that reference ellipsoid
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156 | * used by Lambert is the Clark ellipsoid.
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157 | *
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158 | * @param lat latitude in grad
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159 | * @param lon longitude in grad
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160 | * @param Xs false east (coordinate system origin) in meters
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161 | * @param Ys false north (coordinate system origin) in meters
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162 | * @param c projection constant
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163 | * @param n projection exponent
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164 | * @return EastNorth projected coordinates in meter
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165 | */
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166 | private EastNorth ConicProjection(double lat, double lon, double Xs, double Ys, double c, double n) {
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167 | double eslt = Ellipsoid.clarke.e * Math.sin(lat);
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168 | double l = Math.log(Math.tan(Math.PI / 4.0 + (lat / 2.0))
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169 | * Math.pow((1.0 - eslt) / (1.0 + eslt), Ellipsoid.clarke.e / 2.0));
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170 | double east = Xs + c * Math.exp(-n * l) * Math.sin(n * (lon - lg0));
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171 | double north = Ys - c * Math.exp(-n * l) * Math.cos(n * (lon - lg0));
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172 | return new EastNorth(east, north);
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173 | }
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174 |
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175 | /**
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176 | * Initializes from projected coordinates (conic projection). Note that
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177 | * reference ellipsoid used by Lambert is Clark
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178 | *
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179 | * @param eastNorth projected coordinates pair in meters
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180 | * @param Xs false east (coordinate system origin) in meters
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181 | * @param Ys false north (coordinate system origin) in meters
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182 | * @param c projection constant
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183 | * @param n projection exponent
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184 | * @return LatLon in degree
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185 | */
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186 | private LatLon Geographic(EastNorth eastNorth, double Xs, double Ys, double c, double n) {
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187 | double dx = eastNorth.east() - Xs;
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188 | double dy = Ys - eastNorth.north();
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189 | double R = Math.sqrt(dx * dx + dy * dy);
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190 | double gamma = Math.atan(dx / dy);
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191 | double l = -1.0 / n * Math.log(Math.abs(R / c));
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192 | l = Math.exp(l);
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193 | double lon = lg0 + gamma / n;
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194 | double lat = 2.0 * Math.atan(l) - Math.PI / 2.0;
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195 | double delta = 1.0;
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196 | while (delta > epsilon) {
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197 | double eslt = Ellipsoid.clarke.e * Math.sin(lat);
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198 | double nlt = 2.0 * Math.atan(Math.pow((1.0 + eslt) / (1.0 - eslt), Ellipsoid.clarke.e / 2.0) * l) - Math.PI
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199 | / 2.0;
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200 | delta = Math.abs(nlt - lat);
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201 | lat = nlt;
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202 | }
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203 | return new LatLon(Math.toDegrees(lat), Math.toDegrees(lon)); // in radian
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204 | }
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205 |
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206 | /**
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207 | * Translate latitude/longitude in WGS84, (ellipsoid GRS80) to Lambert
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208 | * geographic, (ellipsoid Clark)
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209 | * @throws IOException
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210 | */
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211 | private LatLon WGS84_to_NTF(LatLon wgs) {
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212 | NTV2GridShift gs = new NTV2GridShift(wgs);
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213 | if (ntf_rgf93Grid != null) {
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214 | ntf_rgf93Grid.gridShiftReverse(gs);
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215 | return new LatLon(wgs.lat()+gs.getLatShiftDegrees(), wgs.lon()+gs.getLonShiftPositiveEastDegrees());
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216 | }
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217 | return new LatLon(0,0);
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218 | }
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219 |
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220 | private LatLon NTF_to_WGS84(LatLon ntf) {
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221 | NTV2GridShift gs = new NTV2GridShift(ntf);
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222 | if (ntf_rgf93Grid != null) {
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223 | ntf_rgf93Grid.gridShiftForward(gs);
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224 | return new LatLon(ntf.lat()+gs.getLatShiftDegrees(), ntf.lon()+gs.getLonShiftPositiveEastDegrees());
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225 | }
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226 | return new LatLon(0,0);
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227 | }
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228 |
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229 | public Bounds getWorldBoundsLatLon()
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230 | {
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231 | Bounds b= new Bounds(
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232 | new LatLon(Math.max(zoneLimitsDegree[layoutZone][1] - cMaxOverlappingZonesDegree, Math.toDegrees(cMinLatZone1Radian)), Math.toDegrees(cMinLonZonesRadian)),
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233 | new LatLon(Math.min(zoneLimitsDegree[layoutZone][0] + cMaxOverlappingZonesDegree, Math.toDegrees(cMaxLatZone1Radian)), Math.toDegrees(cMaxLonZonesRadian)));
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234 | return b;
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235 | }
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236 |
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237 | /**
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238 | * Returns the default zoom scale in pixel per degree ({@see #NavigatableComponent#scale}))
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239 | */
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240 | public double getDefaultZoomInPPD() {
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241 | // this will set the map scaler to about 1000 m (in default scale, 1 pixel will be 10 meters)
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242 | return 10.0;
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243 | }
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244 |
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245 | public int getLayoutZone() {
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246 | return layoutZone;
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247 | }
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248 |
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249 | public static String[] lambert4zones = {
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250 | tr("{0} ({1} to {2} degrees)", 1,"51.30","48.15"),
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251 | tr("{0} ({1} to {2} degrees)", 2,"48.15","45.45"),
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252 | tr("{0} ({1} to {2} degrees)", 3,"45.45","42.76"),
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253 | tr("{0} (Corsica)", 4)
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254 | };
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255 |
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256 | public void setupPreferencePanel(JPanel p) {
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257 | JComboBox prefcb = new JComboBox(lambert4zones);
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258 |
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259 | prefcb.setSelectedIndex(layoutZone);
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260 | p.setLayout(new GridBagLayout());
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261 | p.add(new JLabel(tr("Lambert CC Zone")), GBC.std().insets(5,5,0,5));
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262 | p.add(GBC.glue(1, 0), GBC.std().fill(GBC.HORIZONTAL));
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263 | /* Note: we use component position 2 below to find this again */
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264 | p.add(prefcb, GBC.eop().fill(GBC.HORIZONTAL));
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265 | p.add(new JLabel(ImageProvider.get("data/projection", "Departements_Lambert4Zones.png")), GBC.eol().fill(GBC.HORIZONTAL));
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266 | p.add(GBC.glue(1, 1), GBC.eol().fill(GBC.BOTH));
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267 | }
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268 |
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269 | public Collection<String> getPreferences(JPanel p) {
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270 | Object prefcb = p.getComponent(2);
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271 | if(!(prefcb instanceof JComboBox))
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272 | return null;
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273 | layoutZone = ((JComboBox)prefcb).getSelectedIndex();
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274 | return Collections.singleton(Integer.toString(layoutZone+1));
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275 | }
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276 |
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277 | public void setPreferences(Collection<String> args) {
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278 | layoutZone = DEFAULT_ZONE;
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279 | if (args != null) {
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280 | try {
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281 | for(String s : args)
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282 | {
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283 | layoutZone = Integer.parseInt(s)-1;
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284 | if(layoutZone < 0 || layoutZone > 3) {
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285 | layoutZone = DEFAULT_ZONE;
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286 | }
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287 | break;
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288 | }
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289 | } catch(NumberFormatException e) {}
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290 | }
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291 | }
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292 |
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293 | public Collection<String> getPreferencesFromCode(String code) {
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294 | if (code.startsWith("EPSG:2756") && code.length() == 9) {
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295 | try {
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296 | String zonestring = code.substring(9);
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297 | int zoneval = Integer.parseInt(zonestring);
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298 | if(zoneval >= 1 && zoneval <= 4)
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299 | return Collections.singleton(zonestring);
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300 | } catch(NumberFormatException e) {}
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301 | }
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302 | return null;
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303 | }
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304 |
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305 | }
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