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