1 | /*
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2 | * Copyright (c) 2003 Objectix Pty Ltd All rights reserved.
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3 | *
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4 | * This library is free software; you can redistribute it and/or
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5 | * modify it under the terms of the GNU Lesser General Public
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6 | * License as published by the Free Software Foundation.
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7 | *
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8 | * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
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9 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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10 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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11 | * DISCLAIMED. IN NO EVENT SHALL OBJECTIX PTY LTD BE LIABLE FOR ANY
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12 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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13 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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14 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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15 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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16 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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17 | * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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18 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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19 | */
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20 | package org.openstreetmap.josm.data.projection.datum;
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21 |
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22 | import java.io.IOException;
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23 | import java.io.InputStream;
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24 | import java.io.Serializable;
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25 |
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26 | /**
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27 | * Models the NTv2 Sub Grid within a Grid Shift File
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28 | *
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29 | * @author Peter Yuill
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30 | * Modifified for JOSM :
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31 | * - removed the RandomAccessFile mode (Pieren)
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32 | * - read grid file by single bytes. Workaround for a bug in some VM not supporting
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33 | * file reading by group of 4 bytes from a jar file.
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34 | */
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35 | public class NTV2SubGrid implements Cloneable, Serializable {
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36 |
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37 | private String subGridName;
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38 | private String parentSubGridName;
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39 | private String created;
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40 | private String updated;
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41 | private double minLat;
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42 | private double maxLat;
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43 | private double minLon;
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44 | private double maxLon;
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45 | private double latInterval;
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46 | private double lonInterval;
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47 | private int nodeCount;
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48 |
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49 | private int lonColumnCount;
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50 | private int latRowCount;
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51 | private float[] latShift;
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52 | private float[] lonShift;
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53 | private float[] latAccuracy;
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54 | private float[] lonAccuracy;
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55 |
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56 | boolean bigEndian;
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57 | private NTV2SubGrid[] subGrid;
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58 |
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59 | /**
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60 | * Construct a Sub Grid from an InputStream, loading the node data into
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61 | * arrays in this object.
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62 | *
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63 | * @param in GridShiftFile InputStream
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64 | * @param bigEndian is the file bigEndian?
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65 | * @param loadAccuracy is the node Accuracy data to be loaded?
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66 | * @throws Exception
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67 | */
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68 | public NTV2SubGrid(InputStream in, boolean bigEndian, boolean loadAccuracy) throws IOException {
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69 | byte[] b8 = new byte[8];
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70 | byte[] b4 = new byte[4];
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71 | byte[] b1 = new byte[1];
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72 | in.read(b8);
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73 | in.read(b8);
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74 | subGridName = new String(b8).trim();
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75 | in.read(b8);
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76 | in.read(b8);
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77 | parentSubGridName = new String(b8).trim();
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78 | in.read(b8);
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79 | in.read(b8);
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80 | created = new String(b8);
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81 | in.read(b8);
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82 | in.read(b8);
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83 | updated = new String(b8);
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84 | in.read(b8);
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85 | in.read(b8);
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86 | minLat = NTV2Util.getDouble(b8, bigEndian);
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87 | in.read(b8);
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88 | in.read(b8);
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89 | maxLat = NTV2Util.getDouble(b8, bigEndian);
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90 | in.read(b8);
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91 | in.read(b8);
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92 | minLon = NTV2Util.getDouble(b8, bigEndian);
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93 | in.read(b8);
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94 | in.read(b8);
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95 | maxLon = NTV2Util.getDouble(b8, bigEndian);
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96 | in.read(b8);
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97 | in.read(b8);
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98 | latInterval = NTV2Util.getDouble(b8, bigEndian);
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99 | in.read(b8);
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100 | in.read(b8);
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101 | lonInterval = NTV2Util.getDouble(b8, bigEndian);
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102 | lonColumnCount = 1 + (int)((maxLon - minLon) / lonInterval);
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103 | latRowCount = 1 + (int)((maxLat - minLat) / latInterval);
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104 | in.read(b8);
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105 | in.read(b8);
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106 | nodeCount = NTV2Util.getInt(b8, bigEndian);
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107 | if (nodeCount != lonColumnCount * latRowCount)
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108 | throw new IllegalStateException("SubGrid " + subGridName + " has inconsistent grid dimesions");
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109 | latShift = new float[nodeCount];
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110 | lonShift = new float[nodeCount];
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111 | if (loadAccuracy) {
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112 | latAccuracy = new float[nodeCount];
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113 | lonAccuracy = new float[nodeCount];
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114 | }
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115 |
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116 | for (int i = 0; i < nodeCount; i++) {
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117 | // Read the grid file byte after byte. This is a workaround about a bug in
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118 | // certain VM which are not able to read byte blocks when the resource file is
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119 | // in a .jar file (Pieren)
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120 | in.read(b1); b4[0] = b1[0];
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121 | in.read(b1); b4[1] = b1[0];
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122 | in.read(b1); b4[2] = b1[0];
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123 | in.read(b1); b4[3] = b1[0];
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124 | latShift[i] = NTV2Util.getFloat(b4, bigEndian);
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125 | in.read(b1); b4[0] = b1[0];
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126 | in.read(b1); b4[1] = b1[0];
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127 | in.read(b1); b4[2] = b1[0];
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128 | in.read(b1); b4[3] = b1[0];
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129 | lonShift[i] = NTV2Util.getFloat(b4, bigEndian);
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130 | in.read(b1); b4[0] = b1[0];
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131 | in.read(b1); b4[1] = b1[0];
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132 | in.read(b1); b4[2] = b1[0];
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133 | in.read(b1); b4[3] = b1[0];
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134 | if (loadAccuracy) {
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135 | latAccuracy[i] = NTV2Util.getFloat(b4, bigEndian);
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136 | }
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137 | in.read(b1); b4[0] = b1[0];
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138 | in.read(b1); b4[1] = b1[0];
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139 | in.read(b1); b4[2] = b1[0];
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140 | in.read(b1); b4[3] = b1[0];
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141 | if (loadAccuracy) {
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142 | lonAccuracy[i] = NTV2Util.getFloat(b4, bigEndian);
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143 | }
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144 | }
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145 | }
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146 |
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147 | /**
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148 | * Tests if a specified coordinate is within this Sub Grid
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149 | * or one of its Sub Grids. If the coordinate is outside
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150 | * this Sub Grid, null is returned. If the coordinate is
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151 | * within this Sub Grid, but not within any of its Sub Grids,
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152 | * this Sub Grid is returned. If the coordinate is within
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153 | * one of this Sub Grid's Sub Grids, the method is called
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154 | * recursively on the child Sub Grid.
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155 | *
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156 | * @param lon Longitude in Positive West Seconds
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157 | * @param lat Latitude in Seconds
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158 | * @return the Sub Grid containing the Coordinate or null
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159 | */
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160 | public NTV2SubGrid getSubGridForCoord(double lon, double lat) {
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161 | if (isCoordWithin(lon, lat)) {
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162 | if (subGrid == null)
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163 | return this;
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164 | else {
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165 | for (NTV2SubGrid aSubGrid : subGrid) {
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166 | if (aSubGrid.isCoordWithin(lon, lat))
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167 | return aSubGrid.getSubGridForCoord(lon, lat);
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168 | }
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169 | return this;
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170 | }
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171 | } else
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172 | return null;
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173 | }
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174 |
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175 | /**
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176 | * Tests if a specified coordinate is within this Sub Grid.
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177 | * A coordinate on either outer edge (maximum Latitude or
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178 | * maximum Longitude) is deemed to be outside the grid.
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179 | *
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180 | * @param lon Longitude in Positive West Seconds
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181 | * @param lat Latitude in Seconds
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182 | * @return true or false
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183 | */
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184 | private boolean isCoordWithin(double lon, double lat) {
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185 | if ((lon >= minLon) && (lon < maxLon) && (lat >= minLat) && (lat < maxLat))
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186 | return true;
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187 | else
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188 | return false;
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189 | }
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190 |
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191 | /**
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192 | * Bi-Linear interpolation of four nearest node values as described in
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193 | * 'GDAit Software Architecture Manual' produced by the <a
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194 | * href='http://www.sli.unimelb.edu.au/gda94'>Geomatics
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195 | * Department of the University of Melbourne</a>
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196 | * @param a value at the A node
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197 | * @param b value at the B node
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198 | * @param c value at the C node
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199 | * @param d value at the D node
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200 | * @param X Longitude factor
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201 | * @param Y Latitude factor
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202 | * @return interpolated value
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203 | */
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204 | private final double interpolate(float a, float b, float c, float d, double X, double Y) {
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205 | return a + (((double)b - (double)a) * X) + (((double)c - (double)a) * Y) +
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206 | (((double)a + (double)d - b - c) * X * Y);
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207 | }
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208 |
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209 | /**
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210 | * Interpolate shift and accuracy values for a coordinate in the 'from' datum
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211 | * of the GridShiftFile. The algorithm is described in
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212 | * 'GDAit Software Architecture Manual' produced by the <a
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213 | * href='http://www.sli.unimelb.edu.au/gda94'>Geomatics
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214 | * Department of the University of Melbourne</a>
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215 | * <p>This method is thread safe for both memory based and file based node data.
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216 | * @param gs GridShift object containing the coordinate to shift and the shift values
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217 | * @return the GridShift object supplied, with values updated.
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218 | * @throws IOException
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219 | */
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220 | public NTV2GridShift interpolateGridShift(NTV2GridShift gs) {
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221 | int lonIndex = (int)((gs.getLonPositiveWestSeconds() - minLon) / lonInterval);
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222 | int latIndex = (int)((gs.getLatSeconds() - minLat) / latInterval);
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223 |
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224 | double X = (gs.getLonPositiveWestSeconds() - (minLon + (lonInterval * lonIndex))) / lonInterval;
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225 | double Y = (gs.getLatSeconds() - (minLat + (latInterval * latIndex))) / latInterval;
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226 |
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227 | // Find the nodes at the four corners of the cell
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228 |
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229 | int indexA = lonIndex + (latIndex * lonColumnCount);
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230 | int indexB = indexA + 1;
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231 | int indexC = indexA + lonColumnCount;
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232 | int indexD = indexC + 1;
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233 |
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234 | gs.setLonShiftPositiveWestSeconds(interpolate(
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235 | lonShift[indexA], lonShift[indexB], lonShift[indexC], lonShift[indexD], X, Y));
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236 |
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237 | gs.setLatShiftSeconds(interpolate(
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238 | latShift[indexA], latShift[indexB], latShift[indexC], latShift[indexD], X, Y));
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239 |
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240 | if (lonAccuracy == null) {
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241 | gs.setLonAccuracyAvailable(false);
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242 | } else {
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243 | gs.setLonAccuracyAvailable(true);
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244 | gs.setLonAccuracySeconds(interpolate(
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245 | lonAccuracy[indexA], lonAccuracy[indexB], lonAccuracy[indexC], lonAccuracy[indexD], X, Y));
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246 | }
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247 |
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248 | if (latAccuracy == null) {
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249 | gs.setLatAccuracyAvailable(false);
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250 | } else {
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251 | gs.setLatAccuracyAvailable(true);
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252 | gs.setLatAccuracySeconds(interpolate(
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253 | latAccuracy[indexA], latAccuracy[indexB], latAccuracy[indexC], latAccuracy[indexD], X, Y));
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254 | }
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255 | return gs;
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256 | }
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257 |
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258 | public String getParentSubGridName() {
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259 | return parentSubGridName;
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260 | }
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261 |
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262 | public String getSubGridName() {
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263 | return subGridName;
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264 | }
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265 |
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266 | public int getNodeCount() {
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267 | return nodeCount;
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268 | }
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269 |
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270 | public int getSubGridCount() {
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271 | return (subGrid == null) ? 0 : subGrid.length;
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272 | }
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273 |
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274 | public NTV2SubGrid getSubGrid(int index) {
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275 | return (subGrid == null) ? null : subGrid[index];
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276 | }
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277 |
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278 | /**
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279 | * Set an array of Sub Grids of this sub grid
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280 | * @param subGrid
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281 | */
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282 | public void setSubGridArray(NTV2SubGrid[] subGrid) {
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283 | this.subGrid = subGrid;
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284 | }
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285 |
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286 | @Override
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287 | public String toString() {
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288 | return subGridName;
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289 | }
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290 |
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291 | public String getDetails() {
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292 | StringBuffer buf = new StringBuffer("Sub Grid : ");
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293 | buf.append(subGridName);
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294 | buf.append("\nParent : ");
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295 | buf.append(parentSubGridName);
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296 | buf.append("\nCreated : ");
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297 | buf.append(created);
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298 | buf.append("\nUpdated : ");
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299 | buf.append(updated);
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300 | buf.append("\nMin Lat : ");
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301 | buf.append(minLat);
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302 | buf.append("\nMax Lat : ");
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303 | buf.append(maxLat);
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304 | buf.append("\nMin Lon : ");
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305 | buf.append(minLon);
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306 | buf.append("\nMax Lon : ");
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307 | buf.append(maxLon);
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308 | buf.append("\nLat Intvl: ");
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309 | buf.append(latInterval);
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310 | buf.append("\nLon Intvl: ");
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311 | buf.append(lonInterval);
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312 | buf.append("\nNode Cnt : ");
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313 | buf.append(nodeCount);
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314 | return buf.toString();
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315 | }
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316 |
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317 | /**
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318 | * Make a deep clone of this Sub Grid
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319 | */
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320 | @Override
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321 | public Object clone() {
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322 | NTV2SubGrid clone = null;
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323 | try {
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324 | clone = (NTV2SubGrid)super.clone();
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325 | } catch (CloneNotSupportedException cnse) {
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326 | }
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327 | // Do a deep clone of the sub grids
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328 | if (subGrid != null) {
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329 | clone.subGrid = new NTV2SubGrid[subGrid.length];
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330 | for (int i = 0; i < subGrid.length; i++) {
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331 | clone.subGrid[i] = (NTV2SubGrid)subGrid[i].clone();
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332 | }
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333 | }
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334 | return clone;
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335 | }
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336 | /**
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337 | * Get maximum latitude value
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338 | * @return maximum latitude
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339 | */
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340 | public double getMaxLat() {
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341 | return maxLat;
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342 | }
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343 |
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344 | /**
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345 | * Get maximum longitude value
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346 | * @return maximum longitude
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347 | */
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348 | public double getMaxLon() {
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349 | return maxLon;
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350 | }
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351 |
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352 | /**
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353 | * Get minimum latitude value
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354 | * @return minimum latitude
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355 | */
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356 | public double getMinLat() {
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357 | return minLat;
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358 | }
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359 |
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360 | /**
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361 | * Get minimum longitude value
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362 | * @return minimum longitude
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363 | */
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364 | public double getMinLon() {
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365 | return minLon;
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366 | }
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367 |
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368 | }
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