Mercurial > dive4elements > river

annotate flys-backend/contrib/shpimporter/importer.py @ 3969:8490faba00e7

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dummy merge for repo head
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:15:37 +0200
parents 82e931f88137
children 890eaa0a5162
rev   line source
2861
b0132e1b9719 Added further shape importers and added the option to reproject shapes during the import process.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 2853
diff changeset
1 import ogr, osr
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8654e4480fc6 Shape importer: added command line option dry_run to supress database transactions.
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2 import shpimporter
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3
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4 class Importer:
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5
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6 def __init__(self, config):
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7 self.config = config
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8 self.dbconn = 'OCI:%s/%s@%s' % (config.user, config.password, config.host)
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9 self.river_id = config.river_id
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parents: 2853
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10 self.dest_srs = osr.SpatialReference()
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11 self.dest_srs.ImportFromEPSG(config.target_srs)
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12
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13
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14 def getKind(self, path):
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15 raise NotImplementedError("Importer.getKind is abstract!")
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16
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17
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18 def getPath(self, base):
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19 raise NotImplementedError("Importer.getPath is abstract!")
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20
bd9e76e0b55d Improved the python shapefile importer.
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21
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22 def getTablename(self):
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23 raise NotImplementedError("Importer.getTablename is abstract!")
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24
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25
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26 def getName(self):
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27 raise NotImplementedError("Importer.getTablename is abstract!")
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28
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29
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30 def IsFieldSet(self, feat, name):
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31 try:
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32 isset = feat.GetField(name)
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33 return isset is not None
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34 except:
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35 return False
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36
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37
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38 def IsDoubleFieldSet(self, feat, name):
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39 try:
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40 isset = feat.GetFieldAsDouble(name)
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41 return isset is not None
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42 except:
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43 return False
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44
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45
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46 def isShapeRelevant(self, name, path):
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47 return True
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48
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49
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50 def walkOverShapes(self, shape):
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51 (name, path) = shape
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52 if not self.isShapeRelevant(name, path):
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53 shpimporter.INFO("Skip shapefile '%s'" % path)
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54 return
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55
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56 shp = ogr.Open(shape[1])
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57 if shp is None:
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58 shpimporter.ERROR("Shapefile '%s' could not be opened!" % path)
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59 return
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60
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61 shpimporter.INFO("Processing shapefile '%s'" % path)
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62 srcLayer = shp.GetLayerByName(name)
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63
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64 if srcLayer is None:
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65 shpimporter.ERROR("Layer '%s' was not found!" % name)
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66 return
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67
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68 return self.shape2Database(srcLayer, name, path)
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69
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70
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71 def transform(self, feat):
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72 geometry = feat.GetGeometryRef()
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73 src_srs = geometry.GetSpatialReference()
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74
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75 if src_srs is None:
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76 shpimporter.ERROR("No source SRS given! No transformation possible!")
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77 return feat
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78
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79 transformer = osr.CoordinateTransformation(src_srs, self.dest_srs)
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80 geometry.Transform(transformer)
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81
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82 return feat
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83
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84
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85 def shape2Database(self, srcLayer, name, path):
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86 table = ogr.Open(self.dbconn)
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87 destLayer = table.GetLayerByName(self.getTablename())
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88
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89 if srcLayer is None:
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90 shpimporter.ERROR("Shapefile is None!")
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91 return -1
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92
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93 if destLayer is None:
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94 shpimporter.ERROR("No destination layer given!")
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95 return -1
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96
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97 count = srcLayer.GetFeatureCount()
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98 shpimporter.DEBUG("Try to add %i features to database." % count)
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99
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100 srcLayer.ResetReading()
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101
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102 geomType = -1
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103 success = 0
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104 unsupported = 0
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105 creationFailed = 0
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106 featureDef = destLayer.GetLayerDefn()
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107
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108 for feat in srcLayer:
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109 geom = feat.GetGeometryRef()
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110
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111 if geom is None:
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112 continue
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113
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114 geomType = geom.GetGeometryType()
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115
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116 if self.isGeometryValid(geomType):
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117 newFeat = self.createNewFeature(featureDef,
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118 feat,
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119 name=name,
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120 path=path)
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121
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122 if newFeat is not None:
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123 newFeat.SetField("path", path)
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124 newFeat = self.transform(newFeat)
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125 res = destLayer.CreateFeature(newFeat)
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126 if res is None or res > 0:
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127 shpimporter.ERROR("Unable to insert feature: %r" % res)
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128 else:
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129 success = success + 1
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130 else:
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131 creationFailed = creationFailed + 1
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132 else:
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133 unsupported = unsupported + 1
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134
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135 shpimporter.INFO("Inserted %i features" % success)
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136 shpimporter.INFO("Failed to create %i features" % creationFailed)
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137 shpimporter.INFO("Found %i unsupported features" % unsupported)
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138
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139 try:
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140 if self.config.dry_run > 0:
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141 return geomType
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142 destLayer.CommitTransaction()
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143 except e:
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144 shpimporter.ERROR("Exception while committing transaction.")
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145
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146 return geomType
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147
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