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 | import java.nio.charset.StandardCharsets;
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26 |
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27 | import org.openstreetmap.josm.Main;
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28 | import org.openstreetmap.josm.tools.Utils;
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29 |
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30 | /**
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31 | * Models the NTv2 Sub Grid within a Grid Shift File
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32 | *
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33 | * @author Peter Yuill
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34 | * Modified for JOSM :
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35 | * - removed the RandomAccessFile mode (Pieren)
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36 | * - read grid file by single bytes. Workaround for a bug in some VM not supporting
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37 | * file reading by group of 4 bytes from a jar file.
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38 | * - removed the Cloneable interface
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39 | */
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40 | public class NTV2SubGrid implements Serializable {
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41 |
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42 | private static final long serialVersionUID = 1L;
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43 |
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44 | private final String subGridName;
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45 | private final String parentSubGridName;
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46 | private final String created;
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47 | private final String updated;
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48 | private final double minLat;
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49 | private final double maxLat;
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50 | private final double minLon;
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51 | private final double maxLon;
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52 | private final double latInterval;
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53 | private final double lonInterval;
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54 | private final int nodeCount;
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55 |
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56 | private final int lonColumnCount;
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57 | private final int latRowCount;
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58 | private final float[] latShift;
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59 | private final float[] lonShift;
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60 | private float[] latAccuracy;
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61 | private float[] lonAccuracy;
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62 |
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63 | private NTV2SubGrid[] subGrid;
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64 |
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65 | /**
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66 | * Construct a Sub Grid from an InputStream, loading the node data into
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67 | * arrays in this object.
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68 | *
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69 | * @param in GridShiftFile InputStream
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70 | * @param bigEndian is the file bigEndian?
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71 | * @param loadAccuracy is the node Accuracy data to be loaded?
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72 | * @throws IOException if any I/O error occurs
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73 | */
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74 | public NTV2SubGrid(InputStream in, boolean bigEndian, boolean loadAccuracy) throws IOException {
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75 | byte[] b8 = new byte[8];
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76 | byte[] b4 = new byte[4];
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77 | byte[] b1 = new byte[1];
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78 | readBytes(in, b8);
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79 | readBytes(in, b8);
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80 | subGridName = new String(b8, StandardCharsets.UTF_8).trim();
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81 | readBytes(in, b8);
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82 | readBytes(in, b8);
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83 | parentSubGridName = new String(b8, StandardCharsets.UTF_8).trim();
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84 | readBytes(in, b8);
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85 | readBytes(in, b8);
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86 | created = new String(b8, StandardCharsets.UTF_8);
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87 | readBytes(in, b8);
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88 | readBytes(in, b8);
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89 | updated = new String(b8, StandardCharsets.UTF_8);
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90 | readBytes(in, b8);
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91 | readBytes(in, b8);
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92 | minLat = NTV2Util.getDouble(b8, bigEndian);
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93 | readBytes(in, b8);
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94 | readBytes(in, b8);
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95 | maxLat = NTV2Util.getDouble(b8, bigEndian);
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96 | readBytes(in, b8);
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97 | readBytes(in, b8);
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98 | minLon = NTV2Util.getDouble(b8, bigEndian);
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99 | readBytes(in, b8);
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100 | readBytes(in, b8);
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101 | maxLon = NTV2Util.getDouble(b8, bigEndian);
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102 | readBytes(in, b8);
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103 | readBytes(in, b8);
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104 | latInterval = NTV2Util.getDouble(b8, bigEndian);
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105 | readBytes(in, b8);
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106 | readBytes(in, b8);
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107 | lonInterval = NTV2Util.getDouble(b8, bigEndian);
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108 | lonColumnCount = 1 + (int) ((maxLon - minLon) / lonInterval);
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109 | latRowCount = 1 + (int) ((maxLat - minLat) / latInterval);
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110 | readBytes(in, b8);
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111 | readBytes(in, b8);
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112 | nodeCount = NTV2Util.getInt(b8, bigEndian);
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113 | if (nodeCount != lonColumnCount * latRowCount)
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114 | throw new IllegalStateException("SubGrid " + subGridName + " has inconsistent grid dimesions");
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115 | latShift = new float[nodeCount];
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116 | lonShift = new float[nodeCount];
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117 | if (loadAccuracy) {
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118 | latAccuracy = new float[nodeCount];
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119 | lonAccuracy = new float[nodeCount];
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120 | }
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121 |
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122 | for (int i = 0; i < nodeCount; i++) {
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123 | // Read the grid file byte after byte. This is a workaround about a bug in
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124 | // certain VM which are not able to read byte blocks when the resource file is in a .jar file (Pieren)
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125 | readBytes(in, b1); b4[0] = b1[0];
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126 | readBytes(in, b1); b4[1] = b1[0];
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127 | readBytes(in, b1); b4[2] = b1[0];
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128 | readBytes(in, b1); b4[3] = b1[0];
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129 | latShift[i] = NTV2Util.getFloat(b4, bigEndian);
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130 | readBytes(in, b1); b4[0] = b1[0];
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131 | readBytes(in, b1); b4[1] = b1[0];
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132 | readBytes(in, b1); b4[2] = b1[0];
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133 | readBytes(in, b1); b4[3] = b1[0];
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134 | lonShift[i] = NTV2Util.getFloat(b4, bigEndian);
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135 | readBytes(in, b1); b4[0] = b1[0];
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136 | readBytes(in, b1); b4[1] = b1[0];
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137 | readBytes(in, b1); b4[2] = b1[0];
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138 | readBytes(in, b1); b4[3] = b1[0];
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139 | if (loadAccuracy) {
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140 | latAccuracy[i] = NTV2Util.getFloat(b4, bigEndian);
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141 | }
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142 | readBytes(in, b1); b4[0] = b1[0];
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143 | readBytes(in, b1); b4[1] = b1[0];
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144 | readBytes(in, b1); b4[2] = b1[0];
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145 | readBytes(in, b1); b4[3] = b1[0];
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146 | if (loadAccuracy) {
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147 | lonAccuracy[i] = NTV2Util.getFloat(b4, bigEndian);
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148 | }
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149 | }
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150 | }
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151 |
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152 | private static void readBytes(InputStream in, byte[] b) throws IOException {
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153 | if (in.read(b) < b.length) {
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154 | Main.error("Failed to read expected amount of bytes ("+ b.length +") from stream");
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155 | }
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156 | }
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157 |
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158 | /**
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159 | * Tests if a specified coordinate is within this Sub Grid
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160 | * or one of its Sub Grids. If the coordinate is outside
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161 | * this Sub Grid, null is returned. If the coordinate is
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162 | * within this Sub Grid, but not within any of its Sub Grids,
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163 | * this Sub Grid is returned. If the coordinate is within
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164 | * one of this Sub Grid's Sub Grids, the method is called
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165 | * recursively on the child Sub Grid.
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166 | *
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167 | * @param lon Longitude in Positive West Seconds
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168 | * @param lat Latitude in Seconds
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169 | * @return the Sub Grid containing the Coordinate or null
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170 | */
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171 | public NTV2SubGrid getSubGridForCoord(double lon, double lat) {
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172 | if (isCoordWithin(lon, lat)) {
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173 | if (subGrid == null)
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174 | return this;
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175 | else {
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176 | for (NTV2SubGrid aSubGrid : subGrid) {
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177 | if (aSubGrid.isCoordWithin(lon, lat))
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178 | return aSubGrid.getSubGridForCoord(lon, lat);
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179 | }
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180 | return this;
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181 | }
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182 | } else
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183 | return null;
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184 | }
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185 |
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186 | /**
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187 | * Tests if a specified coordinate is within this Sub Grid.
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188 | * A coordinate on either outer edge (maximum Latitude or
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189 | * maximum Longitude) is deemed to be outside the grid.
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190 | *
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191 | * @param lon Longitude in Positive West Seconds
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192 | * @param lat Latitude in Seconds
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193 | * @return true or false
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194 | */
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195 | private boolean isCoordWithin(double lon, double lat) {
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196 | return (lon >= minLon) && (lon < maxLon) && (lat >= minLat) && (lat < maxLat);
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197 | }
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198 |
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199 | /**
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200 | * Bi-Linear interpolation of four nearest node values as described in
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201 | * 'GDAit Software Architecture Manual' produced by the <a
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202 | * href='http://www.dtpli.vic.gov.au/property-and-land-titles/geodesy/geocentric-datum-of-australia-1994-gda94/gda94-useful-tools'>
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203 | * Geomatics Department of the University of Melbourne</a>
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204 | * @param a value at the A node
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205 | * @param b value at the B node
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206 | * @param c value at the C node
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207 | * @param d value at the D node
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208 | * @param x Longitude factor
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209 | * @param y Latitude factor
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210 | * @return interpolated value
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211 | */
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212 | private static double interpolate(float a, float b, float c, float d, double x, double y) {
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213 | return a + (((double) b - (double) a) * x) + (((double) c - (double) a) * y) +
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214 | (((double) a + (double) d - b - c) * x * y);
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215 | }
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216 |
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217 | /**
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218 | * Interpolate shift and accuracy values for a coordinate in the 'from' datum
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219 | * of the GridShiftFile. The algorithm is described in
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220 | * 'GDAit Software Architecture Manual' produced by the <a
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221 | * href='http://www.dtpli.vic.gov.au/property-and-land-titles/geodesy/geocentric-datum-of-australia-1994-gda94/gda94-useful-tools'>
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222 | * Geomatics Department of the University of Melbourne</a>
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223 | * <p>This method is thread safe for both memory based and file based node data.
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224 | * @param gs GridShift object containing the coordinate to shift and the shift values
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225 | */
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226 | public void interpolateGridShift(NTV2GridShift gs) {
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227 | int lonIndex = (int) ((gs.getLonPositiveWestSeconds() - minLon) / lonInterval);
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228 | int latIndex = (int) ((gs.getLatSeconds() - minLat) / latInterval);
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229 |
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230 | double x = (gs.getLonPositiveWestSeconds() - (minLon + (lonInterval * lonIndex))) / lonInterval;
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231 | double y = (gs.getLatSeconds() - (minLat + (latInterval * latIndex))) / latInterval;
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232 |
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233 | // Find the nodes at the four corners of the cell
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234 |
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235 | int indexA = lonIndex + (latIndex * lonColumnCount);
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236 | int indexB = indexA + 1;
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237 | int indexC = indexA + lonColumnCount;
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238 | int indexD = indexC + 1;
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239 |
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240 | gs.setLonShiftPositiveWestSeconds(interpolate(
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241 | lonShift[indexA], lonShift[indexB], lonShift[indexC], lonShift[indexD], x, y));
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242 |
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243 | gs.setLatShiftSeconds(interpolate(
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244 | latShift[indexA], latShift[indexB], latShift[indexC], latShift[indexD], x, y));
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245 |
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246 | if (lonAccuracy == null) {
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247 | gs.setLonAccuracyAvailable(false);
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248 | } else {
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249 | gs.setLonAccuracyAvailable(true);
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250 | gs.setLonAccuracySeconds(interpolate(
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251 | lonAccuracy[indexA], lonAccuracy[indexB], lonAccuracy[indexC], lonAccuracy[indexD], x, y));
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252 | }
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253 |
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254 | if (latAccuracy == null) {
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255 | gs.setLatAccuracyAvailable(false);
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256 | } else {
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257 | gs.setLatAccuracyAvailable(true);
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258 | gs.setLatAccuracySeconds(interpolate(
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259 | latAccuracy[indexA], latAccuracy[indexB], latAccuracy[indexC], latAccuracy[indexD], x, y));
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260 | }
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261 | }
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262 |
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263 | public String getParentSubGridName() {
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264 | return parentSubGridName;
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265 | }
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266 |
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267 | public String getSubGridName() {
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268 | return subGridName;
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269 | }
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270 |
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271 | public int getNodeCount() {
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272 | return nodeCount;
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273 | }
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274 |
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275 | public int getSubGridCount() {
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276 | return (subGrid == null) ? 0 : subGrid.length;
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277 | }
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278 |
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279 | /**
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280 | * Set an array of Sub Grids of this sub grid
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281 | * @param subGrid subgrids
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282 | */
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283 | public void setSubGridArray(NTV2SubGrid ... subGrid) {
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284 | this.subGrid = Utils.copyArray(subGrid);
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285 | }
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286 |
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287 | @Override
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288 | public String toString() {
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289 | return subGridName;
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290 | }
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291 |
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292 | /**
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293 | * Returns textual details about the sub grid.
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294 | * @return textual details about the sub grid
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295 | */
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296 | public String getDetails() {
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297 | return new StringBuilder(256)
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298 | .append("Sub Grid : ")
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299 | .append(subGridName)
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300 | .append("\nParent : ")
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301 | .append(parentSubGridName)
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302 | .append("\nCreated : ")
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303 | .append(created)
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304 | .append("\nUpdated : ")
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305 | .append(updated)
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306 | .append("\nMin Lat : ")
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307 | .append(minLat)
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308 | .append("\nMax Lat : ")
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309 | .append(maxLat)
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310 | .append("\nMin Lon : ")
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311 | .append(minLon)
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312 | .append("\nMax Lon : ")
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313 | .append(maxLon)
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314 | .append("\nLat Intvl: ")
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315 | .append(latInterval)
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316 | .append("\nLon Intvl: ")
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317 | .append(lonInterval)
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318 | .append("\nNode Cnt : ")
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319 | .append(nodeCount)
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320 | .toString();
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321 | }
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322 |
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323 | /**
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324 | * Get maximum latitude value
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325 | * @return maximum latitude
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326 | */
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327 | public double getMaxLat() {
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328 | return maxLat;
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329 | }
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330 |
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331 | /**
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332 | * Get maximum longitude value
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333 | * @return maximum longitude
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334 | */
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335 | public double getMaxLon() {
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336 | return maxLon;
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337 | }
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338 |
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339 | /**
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340 | * Get minimum latitude value
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341 | * @return minimum latitude
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342 | */
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343 | public double getMinLat() {
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344 | return minLat;
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345 | }
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346 |
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347 | /**
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348 | * Get minimum longitude value
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349 | * @return minimum longitude
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350 | */
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351 | public double getMinLon() {
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352 | return minLon;
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353 | }
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354 | }
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