Snippets
Created by
Marcel Kočíšek
last modified
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 | from qgis.core import QGis , QgsRaster, QgsMapLayerRegistry, QgsFields, QgsField, QgsGeometry, QgsVectorFileWriter, QgsCoordinateReferenceSystem, QgsFeature, QgsCoordinateTransform, QgsVectorLayer, QgsRasterLayer, QgsDistanceArea
import qgis.analysis
import qgis.utils
from PyQt4.QtCore import QVariant
import os
import processing
#errors
QgsGeometryaddPart_errors = {0: "success",
1: "not a multipolygon",
2: "ring is not a valid geometry",
3: "new polygon ring not disjoint with existing polygons of the feature"}
#paths
def getPath(source, name):
source, suffix = os.path.splitext(source) # get suffix and path to file
return source + name
# vectors
def createEmptyVectorLayer(path, formatDriver, fields=None, srcCrs = QgsCoordinateReferenceSystem(4326, QgsCoordinateReferenceSystem.EpsgCrsId), shape=QGis.WKBMultiPolygon, encoding="UTF-8"):
"""
Create empty vector layer.
"""
drivers = QgsVectorFileWriter.ogrDriverList().values()
if formatDriver not in drivers:
print "Not applicable formatDriver" + str(drivers)
return False
writer = QgsVectorFileWriter(path, encoding, fields, shape, srcCrs, formatDriver)
if writer.hasError() != QgsVectorFileWriter.NoError:
print "Error when creating shapefile: ", writer.hasError()
del writer
return False
return writer
def filterRingsToHoles(to, rings, minArea, maxArea, holesfw, *holesFeatureAttributes):
codes = []
for ring in rings:
ringFeature = QgsFeature()
ring_polygon = QgsGeometry.fromPolygon([ring])
area = ring_polygon.area()
if area <= maxArea and area >= minArea: # add to holes
ringFeature.setGeometry(ring_polygon)
newfieldsvalues = [value for value in holesFeatureAttributes] # add tuple of attributes from parameter to array
ringFeature.setAttributes(newfieldsvalues)
holesfw.addFeature(ringFeature)
else: # not in treshold interval, write ring to polygon (valid holes)
code = to.addRing(ring)
codes.append(code)
return to, codes
# layers
def addVectorLayer(path, name, dataProvider="ogr"):
vec = QgsVectorLayer(path, name, dataProvider)
if vec.isValid():
QgsMapLayerRegistry.instance().addMapLayer(vec)
return vec
else:
return False
def layersIterator():
layers = QgsMapLayerRegistry.instance().mapLayers()
for layer in layers:
yield layer, layers
def activeLayersIterator():
canvas = qgis.utils.iface.mapCanvas()
layers = canvas.layers()
for layer in layers:
yield layer.name(), layer
def transformGeometry(geometry, srcCrs, destCrs=QgsCoordinateReferenceSystem(4326, QgsCoordinateReferenceSystem.EpsgCrsId)):
"""
@param geometry QgsGeometry
"""
xform = QgsCoordinateTransform(srcCrs, destCrs)
transformed = geometry.transform(xform)
return transformed
def calculateArea(geom, layerCrs):
"""
Calculate area in square km for Geographic and Projected systems in M2.
Dont recalculate units into meters (if feet)
"""
area = 0
if layerCrs.geographicFlag(): # if geographic system, need to calculate in meters
calculator = QgsDistanceArea()
calculator.setEllipsoid(layerCrs.ellipsoidAcronym())
calculator.setEllipsoidalMode(True)
calculator.computeAreaInit()
if geom.isMultipart() is False: # if only simple polygon, calculate only for this
polyg = geom.asPolygon() # transform to list of points
if len(polyg) > 0:
area = calculator.measurePolygon(polyg[0])
else: # is multipart
multi = geom.asMultiPolygon()
for polyg in multi:
area = area + calculator.measurePolygon(polyg[0])
else:
area = geom.area()
return round(area/1e6, 2)
def getFirstOccurence():
raster = None
vector = None
for layername, layer in activeLayersIterator():
if isinstance(layer, QgsRasterLayer) and raster is None:
raster = layer
elif isinstance(layer, QgsVectorLayer) and vector is None:
vector = layer
if vector is not None and raster is not None:
break
return vector, raster
# PUBLIC
def addLayerFromLayerExtent(path, name="BBoxes", formatDriver="ESRI Shapefile"):
"""
Create layer with geometry of active layers extents.
@param path path of new .shp
"""
fieldsarr = [QgsField("name", QVariant.String), QgsField("xmax" ,QVariant.Double), QgsField("xmin" ,QVariant.Double), QgsField("ymax" ,QVariant.Double), QgsField("ymin" ,QVariant.Double), QgsField("area", QVariant.Double, prec=2)]
fields = QgsFields()
for fild in fieldsarr:
fields.append(fild)
newvector = createEmptyVectorLayer(path, formatDriver, fields)
if newvector:
for layername, layer in activeLayersIterator():
refcrs = layer.crs()
extent = layer.extent()
extentpolyg = QgsGeometry.fromWkt(extent.asWktPolygon())
area = calculateArea(extentpolyg, refcrs)
print layername + " - " + str(area)
fet = QgsFeature()
transformed = transformGeometry(extentpolyg, refcrs)
if transformed == 0:
fet.setGeometry(extentpolyg)
else:
print "its not possible to transform extent of layer to EPSG:4326"
continue
fet.setAttributes([layername ,extent.xMaximum(), extent.xMinimum(), extent.yMaximum(), extent.yMinimum(), area])
newvector.addFeature(fet)
added = addVectorLayer(path, name)
if added:
"Vector Layer added."
else:
"Its not possible to add vector layer to map canvas"
else:
print "IS not possible to creaate new vector (exists?)"
del newvector
# maptools.addLayerFromLayerExtent("C:\\marcel\\KML\\surveysbboxes.kml")
def transformActiveVectorLayers(destCrs, name="TRANSFORMED", dataProvider="ESRI Shapefile"):
"""
copy all active layers and add spcifed name to path of layer. Not for memory layers.
@param destCrs {String} WKT, PROJ4, EPSG: ...
"""
for layername, layer in activeLayersIterator():
provider= layer.dataProvider()
if layer.type() < 1 and provider.name() != "memory" and layer.hasGeometryType(): #if vector
source, suffix = os.path.splitext(layer.source()) # get suffix and path to file
path = source + name
print path
destCrsS = QgsCoordinateReferenceSystem(destCrs)
newvector = createEmptyVectorLayer(path, dataProvider, layer.pendingFields(), destCrsS, layer.wkbType(), layer.dataProvider().encoding())
if newvector:
srcCrs = layer.crs()
for feature in layer.getFeatures(): # iter over features in active layer
fet = QgsFeature(feature)
transform = transformGeometry(fet.geometry(), srcCrs, destCrsS)
if transform > 0:
print "not possible to transform geometry of feature" + feature.id() + "in " + layername
continue
newvector.addFeature(fet)
# added = addVectorLayer(path, name + layername)
# if added:
print "Vector layer " + layername + " transformed"
# else:
# print "Vector " + path + "not found."
else:
print "IS not possible to creaate new vector (exists?)"
del newvector
else:
print layername + "is not valid Vector"
def drapeAndAddZAttribute():
invector, inraster = getFirstOccurence()
if invector is None or inraster is None:
raise Exception("In map canvas arent vector or raster")
processing.runalg("grass:v.drape", invector, inraster, 0, None, None, -9999999, None, None, None, 1, "C:\\marcel\\draped.shp")
def extractZFromRaster(name="EXTRACTED", attributeFieldName="TWT_SEIS", fieldType = QVariant.Double, band=1, precision=6, invert=True, dataProvider="ESRI Shapefile"):
invector, inraster = getFirstOccurence()
path = getPath(invector.source(), name)
newfields = QgsFields(invector.pendingFields())
newfields.append(QgsField(attributeFieldName, fieldType))
if invector.type() < 1 and invector.dataProvider().name() != "memory" and invector.hasGeometryType(): #if vector
layerWkbType = invector.wkbType()
if layerWkbType == QGis.WKBPoint or layerWkbType == QGis.WKBPoint25D:
newvector = createEmptyVectorLayer(path, dataProvider, newfields, invector.crs(), invector.wkbType(), invector.dataProvider().encoding())
if newvector:
features = invector.getFeatures()
for feature in features:
oldfeatureattr = feature.attributes()
newfeature = QgsFeature(feature)
oldgeom = feature.geometry().asPoint()
# newfeature.setGeometry(QgsGeometry.fromPoint(oldgeom))
newfeature.setFields(newfields)
ident = inraster.dataProvider().identify(oldgeom, QgsRaster.IdentifyFormatValue)
result = ident.results()
value = result[band]
if value is not None:
if fieldType == QVariant.Double:
value = round(value, precision)
if invert:
value = value * -1
oldfeatureattr.append(value)
newfeature.setAttributes(oldfeatureattr)
newvector.addFeature(newfeature)
else:
print "IS not possible to creaate new vector "+ path + "(exists?)"
else:
print invector.name() + " is not point Vector"
else:
print invector.name() + "is not valid vector"
def fillHoles(minArea, maxArea,output = "FILLEDHOLES" , holes="HOLES", dataProvider="ESRI Shapefile"):
fieldsarr = [QgsField("polygonId", QVariant.Int)]
fieldsholes = QgsFields()
for fild in fieldsarr:
fieldsholes.append(fild)
for layername, layer in activeLayersIterator():
provider = layer.dataProvider()
if layer.type() < 1 and provider.name() != "memory" and layer.hasGeometryType(): #if vector
layerWkbType = layer.wkbType()
if layerWkbType == QGis.WKBPolygon or layerWkbType == QGis.WKBMultiPolygon or layerWkbType == QGis.WKBPolygon25D or layerWkbType == QGis.WKBMultiPolygon25D:
destCrs = layer.crs()
features = layer.getFeatures()
lsource = layer.source()
filledpath = getPath(lsource, output + "_" + str(minArea) + "_" + str(maxArea))
holespath = getPath(lsource, holes + "_" + str(minArea) + "_" + str(maxArea))
holes = createEmptyVectorLayer(holespath, dataProvider, fieldsholes, destCrs, layer.wkbType(), provider.encoding())
filled = createEmptyVectorLayer(filledpath, dataProvider, layer.pendingFields(), destCrs, layer.wkbType(), provider.encoding())
if filled and holes:
for feature in features:
filledFeature = QgsFeature(feature)
geom = feature.geometry()
if not geom.isMultipart():
print str(feature.id()) + " is not multipart"
polygon = geom.asPolygon()
mainring = QgsGeometry.fromPolygon([polygon[0]]) # add first main ring polygon
filteredpolygon, ringscodes = filterRingsToHoles(mainring, polygon[1:], minArea, maxArea, holes, filledFeature.id())
filledFeature.setGeometry(filteredpolygon)
else:
multipolyg = geom.asMultiPolygon()
print str(feature.id()) + " is multipart"
filledGeometry = filledFeature.geometry() # multipolygon
for polygon in multipolyg:
deleteParterror = filledGeometry.deletePart(0) # delete actual first part
if deleteParterror:
part = QgsGeometry.fromPolygon([polygon[0]])
filteredpart, ringscodes = filterRingsToHoles(part, polygon[1:], minArea, maxArea, holes, filledFeature.id())
partcode = filledGeometry.addPartGeometry(filteredpart) # toggle actual part
if partcode > 0:
print "Part of polygon with index " + partindex + " is not valid added, error: " + QgsGeometryaddPart_errors[partcode]
else:
print "Unable to delete part " + partindex + " from multipolygon with id " + filledFeature.id()
filled.addFeature(filledFeature)
print "Created layer with filled holes " + filledpath
print "Created layer with holes " + holespath
else:
print "IS not possible to creaate new vectors "+ holespath + "and" + filledpath + "(exists?)"
del holespath
del filledpath
else:
print layername + " is not polygonal valid Vector"
else:
layername + "is not valid vector"
def statsFromRasterToPolygon():
invector, inraster = getFirstOccurence()
zonalstats = qgis.analysis.QgsZonalStatistics(invector, inraster.source(), stats=qgis.analysis.QgsZonalStatistics.All)
code = zonalstats.calculateStatistics(None)
if code > 0:
print "By calculating occured error " + code
return code
# # selecting # #
def selectByGeometry(selectFunction):
pass
# # addaptive intersect # #
## TODO:USING OGR TO WRITE NEW LAYER
def addaptiveIntersect(inputLayer, intersectLayer, addaptive=50, name = "INTERSECTED", dataProvider = "ESRI Shapefile", lines=True):
outputpath = getPath(inputLayer.source(), name)
print inputLayer.wkbType()
output = createEmptyVectorLayer(outputpath, dataProvider, inputLayer.pendingFields(), inputLayer.crs(), inputLayer.wkbType(), inputLayer.dataProvider().encoding())
if output:
layerWkbType = inputLayer.wkbType()
if inputLayer.type() < 1 and inputLayer.name() != "memory" and inputLayer.hasGeometryType() and intersectLayer.type() < 1 and intersectLayer.name() != "memory" and intersectLayer.hasGeometryType(): #if vector
for feat in inputLayer.getFeatures():
ingeom = feat.geometry()
newfeature = QgsFeature(feat)
for interf in intersectLayer.getFeatures():
intersectgeom = interf.geometry()
diffgeom = ingeom.difference(intersectgeom)
intersection = ingeom.intersection(intersectgeom)
if layerWkbType == QGis.WKBLineString or layerWkbType == QGis.WKBMultiLineString or layerWkbType == QGis.WKBLineString25D or layerWkbType == QGis.WKBMultiLineString25D:
if intersection.asPolyline() != [] or intersection.asMultiPolyline() != []:
if not intersection.isEmpty() and not diffgeom.isEmpty(): # if is not empty after difference
# newfeature.setGeometry(intersection)
## here filter for length of intersected
if intersection.isMultipart() and diffgeom.isMultipart(): # only for multiparts
intersectpoly = intersection.asMultiPolyline()
diffpoly = diffgeom.asMultiPolyline()
for index, diff in enumerate(diffpoly):# for every line from difference
diffpart = QgsGeometry.fromPolyline(diff)
len = diffpart.length() # check length
if len < addaptive and intersection.touches(diffpart):
if index == 0:
intersectpoly.insert(index, diff) # insert to multi polyline
else:
intersectpoly.insert(index + 1, diff)
newfeature.setGeometry(QgsGeometry.fromMultiPolyline(intersectpoly))
else:
twodintersection = intersection.asPolyline()
len = diffgeom.length()
if len < addaptive and intersection.touches(diffgeom):
if diffgeom.asPolyline() != []:
diff2d = QgsGeometry.fromPolyline(diffgeom.asPolyline())
else:
diff2d = QgsGeometry.fromMultiPolyline(diffgeom.asMultiPolyline())
union = QgsGeometry.unaryUnion([QgsGeometry.fromPolyline(twodintersection), diff2d])
newfeature.setGeometry(union)
else:
newfeature.setGeometry(QgsGeometry.fromPolyline(twodintersection))
output.addFeature(newfeature)
# if interf.id() == 57:
# print interf.id()
# print newfeature.geometry().exportToWkt()
else:
inputLayer.name() + " is not valid Vector"
print outputpath + " Created "
else:
print "IS not possible to creaate new vectors "+ outputpath + "and(exists?)"
del output
|
Comments (0)
You can clone a snippet to your computer for local editing. Learn more.