1 | #!/usr/bin/env python |
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2 | ############################################################################### |
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3 | # $Id: mkgraticule.py 18216 2009-12-08 19:13:48Z rouault $ |
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4 | # |
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5 | # Project: OGR Python samples |
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6 | # Purpose: Produce a graticule (grid) dataset. |
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7 | # Author: Frank Warmerdam, warmerdam@pobox.com |
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8 | # |
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9 | ############################################################################### |
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10 | # Copyright (c) 2003, Frank Warmerdam <warmerdam@pobox.com> |
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11 | # |
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12 | # Permission is hereby granted, free of charge, to any person obtaining a |
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13 | # copy of this software and associated documentation files (the "Software"), |
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14 | # to deal in the Software without restriction, including without limitation |
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15 | # the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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16 | # and/or sell copies of the Software, and to permit persons to whom the |
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17 | # Software is furnished to do so, subject to the following conditions: |
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18 | # |
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19 | # The above copyright notice and this permission notice shall be included |
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20 | # in all copies or substantial portions of the Software. |
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21 | # |
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22 | # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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23 | # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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24 | # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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25 | # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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26 | # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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27 | # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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28 | # DEALINGS IN THE SOFTWARE. |
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29 | ############################################################################### |
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30 | |
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31 | try: |
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32 | from osgeo import osr |
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33 | from osgeo import ogr |
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34 | except ImportError: |
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35 | import osr |
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36 | import ogr |
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37 | |
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38 | import string |
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39 | import sys |
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40 | |
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41 | ############################################################################# |
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42 | def float_range(*args): |
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43 | start = 0.0 |
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44 | step = 1.0 |
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45 | if (len(args) == 1): |
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46 | (stop,) = args |
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47 | elif (len(args) == 2): |
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48 | (start, stop) = args |
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49 | elif (len(args) == 3): |
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50 | (start, stop, step) = args |
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51 | else: |
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52 | raise TypeError("float_range needs 1-3 float arguments") |
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53 | |
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54 | the_range = [] |
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55 | steps = (stop-start)/step |
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56 | if steps != int(steps): |
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57 | steps = steps + 1.0 |
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58 | for i in range(int(steps)): |
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59 | the_range.append(i*step+start) |
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60 | |
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61 | return the_range |
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62 | |
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63 | |
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64 | ############################################################################# |
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65 | def Usage(): |
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66 | print ('Usage: mkgraticule [-connected] [-s stepsize] [-substep substepsize]') |
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67 | print (' [-t_srs srs] [-range xmin ymin xmax ymax] outfile') |
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68 | print('') |
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69 | sys.exit(1) |
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70 | |
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71 | ############################################################################# |
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72 | # Argument processing. |
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73 | |
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74 | t_srs = None |
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75 | stepsize = 5.0 |
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76 | substepsize = 5.0 |
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77 | connected = 0 |
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78 | outfile = None |
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79 | |
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80 | xmin = -180 |
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81 | xmax = 180 |
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82 | ymin = -90 |
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83 | ymax = 90 |
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84 | |
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85 | i = 1 |
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86 | while i < len(sys.argv): |
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87 | if sys.argv[i] == '-connected': |
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88 | connected = 1 |
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89 | elif sys.argv[i] == '-t_srs': |
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90 | i = i + 1 |
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91 | t_srs = sys.argv[i] |
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92 | elif sys.argv[i] == '-s': |
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93 | i = i + 1 |
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94 | stepsize = float(sys.argv[i]) |
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95 | elif sys.argv[i] == '-substep': |
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96 | i = i + 1 |
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97 | substepsize = float(sys.argv[i]) |
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98 | elif sys.argv[i] == '-range': |
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99 | xmin = float(sys.argv[i+1]) |
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100 | ymin = float(sys.argv[i+2]) |
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101 | xmax = float(sys.argv[i+3]) |
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102 | ymax = float(sys.argv[i+4]) |
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103 | i = i + 4 |
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104 | elif sys.argv[i][0] == '-': |
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105 | Usage() |
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106 | elif outfile is None: |
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107 | outfile = sys.argv[i] |
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108 | else: |
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109 | Usage() |
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110 | |
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111 | i = i + 1 |
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112 | |
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113 | if outfile is None: |
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114 | outfile = "graticule.shp" |
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115 | |
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116 | |
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117 | if substepsize > stepsize: |
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118 | substepsize = stepsize |
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119 | |
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120 | #############################################################################- |
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121 | # Do we have an alternate SRS? |
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122 | |
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123 | ct = None |
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124 | |
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125 | if t_srs is not None: |
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126 | t_srs_o = osr.SpatialReference() |
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127 | t_srs_o.SetFromUserInput( t_srs ) |
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128 | |
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129 | s_srs_o = osr.SpatialReference() |
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130 | s_srs_o.SetFromUserInput( 'WGS84' ) |
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131 | |
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132 | ct = osr.CoordinateTransformation( s_srs_o, t_srs_o ) |
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133 | else: |
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134 | t_srs_o = osr.SpatialReference() |
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135 | t_srs_o.SetFromUserInput( 'WGS84' ) |
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136 | |
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137 | #############################################################################- |
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138 | # Create graticule file. |
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139 | |
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140 | drv = ogr.GetDriverByName( 'ESRI Shapefile' ) |
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141 | |
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142 | try: |
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143 | drv.DeleteDataSource( outfile ) |
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144 | except: |
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145 | pass |
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146 | |
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147 | ds = drv.CreateDataSource( outfile ) |
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148 | layer = ds.CreateLayer( 'out', geom_type = ogr.wkbLineString, |
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149 | srs = t_srs_o ) |
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150 | |
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151 | ######################################################################### |
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152 | # Not connected case. Produce individual segments are these are going to |
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153 | # be more resilent in the face of reprojection errors. |
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154 | |
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155 | if not connected: |
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156 | ######################################################################### |
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157 | # Generate lines of latitude. |
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158 | |
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159 | feat = ogr.Feature( feature_def = layer.GetLayerDefn() ) |
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160 | geom = ogr.Geometry( type = ogr.wkbLineString ) |
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161 | |
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162 | for lat in float_range(ymin,ymax+stepsize/2,stepsize): |
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163 | for long in float_range(xmin,xmax-substepsize/2,substepsize): |
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164 | |
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165 | geom.SetPoint( 0, long, lat ) |
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166 | geom.SetPoint( 1, long+substepsize, lat ) |
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167 | |
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168 | err = 0 |
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169 | if ct is not None: |
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170 | err = geom.Transform( ct ) |
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171 | |
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172 | if err is 0: |
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173 | feat.SetGeometry( geom ) |
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174 | layer.CreateFeature( feat ) |
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175 | |
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176 | ######################################################################### |
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177 | # Generate lines of longitude |
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178 | |
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179 | for long in float_range(xmin,xmax+stepsize/2,stepsize): |
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180 | for lat in float_range(ymin,ymax-substepsize/2,substepsize): |
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181 | geom.SetPoint( 0, long, lat ) |
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182 | geom.SetPoint( 1, long, lat+substepsize ) |
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183 | |
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184 | err = 0 |
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185 | if ct is not None: |
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186 | err = geom.Transform( ct ) |
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187 | |
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188 | if err is 0: |
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189 | feat.SetGeometry( geom ) |
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190 | layer.CreateFeature( feat ) |
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191 | |
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192 | |
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193 | ######################################################################### |
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194 | # Connected case - produce one polyline for each complete line of latitude |
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195 | # or longitude. |
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196 | |
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197 | if connected: |
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198 | ######################################################################### |
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199 | # Generate lines of latitude. |
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200 | |
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201 | feat = ogr.Feature( feature_def = layer.GetLayerDefn() ) |
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202 | |
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203 | for lat in float_range(ymin,ymax+stepsize/2,stepsize): |
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204 | |
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205 | geom = ogr.Geometry( type = ogr.wkbLineString ) |
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206 | |
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207 | for long in float_range(xmin,xmax+substepsize/2,substepsize): |
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208 | geom.AddPoint( long, lat ) |
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209 | |
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210 | err = 0 |
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211 | if ct is not None: |
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212 | err = geom.Transform( ct ) |
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213 | |
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214 | if err is 0: |
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215 | feat.SetGeometry( geom ) |
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216 | layer.CreateFeature( feat ) |
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217 | |
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218 | ######################################################################### |
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219 | # Generate lines of longitude |
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220 | |
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221 | for long in float_range(xmin,xmax+stepsize/2,stepsize): |
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222 | |
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223 | geom = ogr.Geometry( type = ogr.wkbLineString ) |
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224 | |
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225 | for lat in float_range(ymin,ymax+substepsize/2,substepsize): |
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226 | geom.AddPoint( long, lat ) |
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227 | |
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228 | err = 0 |
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229 | if ct is not None: |
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230 | err = geom.Transform( ct ) |
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231 | |
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232 | if err is 0: |
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233 | feat.SetGeometry( geom ) |
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234 | layer.CreateFeature( feat ) |
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235 | |
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236 | ############################################################################# |
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237 | # Cleanup |
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238 | |
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239 | feat = None |
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240 | geom = None |
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241 | |
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242 | ds.Destroy() |
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243 | ds = None |
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244 | |
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