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.junit.Assert.assertTrue;
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5 |
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6 | import java.security.SecureRandom;
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7 | import java.util.Arrays;
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8 | import java.util.Collection;
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9 | import java.util.HashSet;
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10 | import java.util.Random;
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11 |
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12 | import org.junit.Assert;
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13 | import org.junit.Test;
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14 | import org.openstreetmap.josm.data.Bounds;
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15 | import org.openstreetmap.josm.data.coor.EastNorth;
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16 | import org.openstreetmap.josm.data.coor.LatLon;
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17 |
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18 | /**
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19 | * Unit tests for class {@link Projection}.
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20 | */
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21 | public class ProjectionTest {
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22 |
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23 | private static final Random rand = new SecureRandom();
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24 |
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25 | boolean error;
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26 | String text;
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27 |
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28 | /**
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29 | * Tests that projections are numerically stable in their definition bounds (round trip error < 1e-5)
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30 | */
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31 | @Test
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32 | public void testProjections() {
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33 | error = false;
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34 | text = "";
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35 |
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36 | testProjection(Projections.getProjectionByCode("EPSG:4326")); // WGS 84
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37 | testProjection(Projections.getProjectionByCode("EPSG:3857")); // Mercator
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38 | testProjection(Projections.getProjectionByCode("EPSG:3301")); // Lambert EST
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39 |
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40 | for (int i = 0; i <= 3; ++i) {
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41 | testProjection(Projections.getProjectionByCode("EPSG:"+Integer.toString(27561+i))); // Lambert 4 Zones France
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42 | }
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43 |
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44 | for (int i = 0; i <= 4; ++i) {
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45 | testProjection(Projections.getProjectionByCode("EPSG:"+Integer.toString(2176+i))); // PUWG Poland
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46 | }
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47 |
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48 | testProjection(Projections.getProjectionByCode("EPSG:21781")); // Swiss grid
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49 |
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50 | for (int i = 0; i <= 60; ++i) {
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51 | testProjection(Projections.getProjectionByCode("EPSG:"+Integer.toString(32601+i))); // UTM North
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52 | testProjection(Projections.getProjectionByCode("EPSG:"+Integer.toString(32701+i))); // UTM South
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53 | }
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54 |
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55 | for (String c : Arrays.asList("2969", "2970", "2972", "2973")) {
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56 | testProjection(Projections.getProjectionByCode("EPSG:"+c)); // UTM France DOM
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57 | }
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58 |
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59 | for (int i = 0; i <= 8; ++i) {
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60 | testProjection(Projections.getProjectionByCode("EPSG:"+Integer.toString(3942+i))); // Lambert CC9 Zones France
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61 | }
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62 |
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63 | for (int i = 0; i <= 17; ++i) {
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64 | testProjection(Projections.getProjectionByCode("EPSG:"+Integer.toString(102421+i))); // WGS_1984_ARC_System Zones
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65 | }
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66 |
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67 | testProjection(Projections.getProjectionByCode("EPSG:102016")); // North Pole
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68 | testProjection(Projections.getProjectionByCode("EPSG:102019")); // South Pole
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69 |
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70 | if (error) {
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71 | System.err.println(text);
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72 | Assert.fail();
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73 | }
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74 | }
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75 |
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76 | private void testProjection(Projection p) {
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77 | if (p != null) {
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78 | double maxErrLat = 0, maxErrLon = 0;
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79 | Bounds b = p.getWorldBoundsLatLon();
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80 |
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81 | text += String.format("*** %s %s%n", p.toString(), p.toCode());
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82 | for (int num = 0; num < 1000; ++num) {
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83 |
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84 | LatLon ll0 = random(b);
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85 | LatLon ll = ll0;
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86 |
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87 | for (int i = 0; i < 10; ++i) {
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88 | EastNorth en = p.latlon2eastNorth(ll);
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89 | ll = p.eastNorth2latlon(en);
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90 | }
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91 | maxErrLat = Math.max(maxErrLat, Math.abs(ll0.lat() - ll.lat()));
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92 | maxErrLon = Math.max(maxErrLon, Math.abs(ll0.lon() - ll.lon()));
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93 | }
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94 |
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95 | String mark = "";
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96 | if (maxErrLat + maxErrLon > 1e-5) {
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97 | mark = "--FAILED-- ";
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98 | error = true;
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99 | }
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100 | text += String.format("%s errorLat: %s errorLon: %s%n", mark, maxErrLat, maxErrLon);
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101 | }
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102 | }
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103 |
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104 | private LatLon random(Bounds b) {
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105 | for (int i = 0; i < 20; i++) {
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106 | double lat = rand.nextDouble() * (b.getMax().lat() - b.getMin().lat()) + b.getMin().lat();
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107 | double lon = rand.nextDouble() * (b.getMax().lon() - b.getMin().lon()) + b.getMin().lon();
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108 | LatLon result = new LatLon(lat, lon);
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109 | if (result.isValid()) return result;
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110 | }
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111 | throw new RuntimeException();
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112 | }
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113 |
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114 | boolean error2;
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115 | String text2;
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116 | Collection<String> projIds;
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117 |
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118 | /**
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119 | * Tests that projections are numerically stable in their definition bounds (round trip error < epsilon)
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120 | */
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121 | @Test
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122 | public void testProjs() {
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123 | error2 = false;
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124 | text2 = "";
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125 |
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126 | projIds = new HashSet<>(Projections.getAllBaseProjectionIds());
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127 |
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128 | final double EPS = 1e-6;
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129 | testProj("lonlat", EPS, "");
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130 | testProj("lcc", EPS, "+lat_0=34");
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131 | testProj("lcc", EPS, "+lat_1=87 +lat_2=83.6 +lat_0=85.43");
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132 | testProj("somerc", EPS, "+lat_0=47");
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133 | testProj("tmerc", 1e-5, "+bounds=-2.5,-89,2.5,89");
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134 | testProj("tmerc", 2e-3, "");
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135 | testProj("sterea", EPS, "+lat_0=52");
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136 | testProj("aea", EPS, "+lat_1=27.5 +lat_2=35 +lat_0=18");
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137 | testProj("stere", 1e-5, "+lat_0=-90 +lat_ts=-70");
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138 | testProj("stere", 1e-5, "+lat_0=90 +lat_ts=90");
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139 | testProj("omerc", EPS, "+lat_0=4 +lonc=115 +alpha=53 +no_uoff +gamma=53.130 +bounds=112,4,116,7");
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140 | testProj("cass", 1e-3, "+lat_0=11 +bounds=-1.0,-89,1.0,89");
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141 | testProj("laea", 3e-3, "+lat_0=34");
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142 | testProj("merc", 1e-5, "");
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143 | testProj("sinu", 1e-4, "");
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144 | testProj("aeqd", 1e-5, "+lon_0=0dE +lat_0=90dN");
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145 | testProj("aeqd", 1e-5, "+lon_0=0dE +lat_0=90dS");
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146 | testProj("eqc", 1e-5, "");
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147 |
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148 | if (error2) {
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149 | System.err.println(text2);
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150 | Assert.fail();
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151 | }
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152 | assertTrue("missing test: "+projIds, projIds.isEmpty());
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153 | }
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154 |
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155 | private void testProj(String id, double eps, String prefAdd) {
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156 | final int NUM_IT = 1000;
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157 | projIds.remove(id);
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158 | String pref = String.format("+proj=%s +ellps=WGS84 +nadgrids=null "+prefAdd, id);
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159 | CustomProjection p = new CustomProjection();
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160 | try {
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161 | p.update(pref);
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162 | } catch (ProjectionConfigurationException ex) {
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163 | throw new RuntimeException(ex);
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164 | }
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165 | Bounds b = p.getWorldBoundsLatLon();
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166 | double maxDist = 0;
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167 | LatLon maxLatLon = null;
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168 | for (int i = 0; i < NUM_IT; i++) {
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169 | LatLon ll1 = random(b);
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170 | EastNorth en = p.latlon2eastNorth(ll1);
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171 | LatLon ll2 = p.eastNorth2latlon(en);
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172 | assertTrue(p.toCode() + " at " + ll1 + " is " + ll2, ll2.isValid());
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173 | double dist = ll1.greatCircleDistance(ll2);
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174 | if (dist > eps) {
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175 | error2 = true;
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176 | if (dist > maxDist) {
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177 | maxDist = dist;
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178 | maxLatLon = ll1;
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179 | }
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180 | }
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181 | }
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182 | if (maxDist > 0) {
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183 | text2 += id + ": dist " + maxDist + " at " + maxLatLon + "\n";
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184 | }
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185 | }
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186 |
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187 | /**
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188 | * Checks that Swedish projections have their axis defined correctly.
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189 | */
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190 | @Test
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191 | public void testSwedishProjections() {
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192 | for (int code = 3006; code <= 3018; code++) {
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193 | assertTrue(Projections.getProjectionByCode("EPSG:"+code).switchXY());
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194 | }
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195 | }
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196 | }
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