mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-27 00:33:48 -05:00
235 lines
9.2 KiB
Python
Executable File
235 lines
9.2 KiB
Python
Executable File
#-----------------------------------------------------------
|
|
#
|
|
# Create Point Distance Matrix
|
|
#
|
|
# A QGIS plugin for measuring distances between points. Measure
|
|
# distances between two point layers, and output the results
|
|
# as: a) Standard distance matrix, b) Linear distance matrix
|
|
# or c) Summary distance matrix
|
|
#
|
|
# Copyright (C) 2008 Carson Farmer
|
|
#
|
|
# EMAIL: carson.farmer (at) gmail.com
|
|
# WEB : www.geog.uvic.ca/spar/carson
|
|
#
|
|
#-----------------------------------------------------------
|
|
#
|
|
# licensed under the terms of GNU GPL 2
|
|
#
|
|
# This program is free software; you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation; either version 2 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License along
|
|
# with this program; if not, write to the Free Software Foundation, Inc.,
|
|
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
#
|
|
#---------------------------------------------------------------------
|
|
|
|
from PyQt4.QtCore import *
|
|
from PyQt4.QtGui import *
|
|
|
|
from qgis.core import *
|
|
from ui_frmPointDistance import Ui_Dialog
|
|
import csv
|
|
from math import *
|
|
class Dialog(QDialog, Ui_Dialog):
|
|
def __init__(self, iface):
|
|
QDialog.__init__(self)
|
|
self.iface = iface
|
|
# Set up the user interface from Designer.
|
|
self.setupUi(self)
|
|
QObject.connect(self.btnFile, SIGNAL("clicked()"), self.saveFile)
|
|
QObject.connect(self.inPoint1, SIGNAL("currentIndexChanged(QString)"), self.update1)
|
|
QObject.connect(self.inPoint2, SIGNAL("currentIndexChanged(QString)"), self.update2)
|
|
# populate layer list
|
|
self.setWindowTitle(self.tr("Distance matrix"))
|
|
self.progressBar.setValue(0)
|
|
mapCanvas = self.iface.mapCanvas()
|
|
for i in range(mapCanvas.layerCount()):
|
|
layer = mapCanvas.layer(i)
|
|
if layer.type() == layer.VectorLayer:
|
|
if layer.geometryType() == QGis.Point:
|
|
self.inPoint1.addItem(layer.name())
|
|
self.inPoint2.addItem(layer.name())
|
|
|
|
def update1(self, inputLayer):
|
|
changedLayer = self.getVectorLayerByName(unicode(inputLayer))
|
|
changedField = self.getFieldList(changedLayer)
|
|
for i in changedField:
|
|
if changedField[i].type() == QVariant.Int or changedField[i].type() == QVariant.String:
|
|
self.inField1.addItem(unicode(changedField[i].name()))
|
|
|
|
def update2(self, inputLayer):
|
|
changedLayer = self.getVectorLayerByName(unicode(inputLayer))
|
|
changedField = self.getFieldList(changedLayer)
|
|
for i in changedField:
|
|
if changedField[i].type() == QVariant.Int or changedField[i].type() == QVariant.String:
|
|
self.inField2.addItem(unicode(changedField[i].name()))
|
|
|
|
def accept(self):
|
|
if self.inPoint1.currentText() == "":
|
|
QMessageBox.information(self, self.tr("Create Point Distance Matrix"), self.tr("Please specify input point layer"))
|
|
elif self.outFile.text() == "":
|
|
QMessageBox.information(self, self.tr("Create Point Distance Matrix"), self.tr("Please specify output file"))
|
|
elif self.inPoint2.currentText() == "":
|
|
QMessageBox.information(self, self.tr("Create Point Distance Matrix"), self.tr("Please specify target point layer"))
|
|
elif self.inField1.currentText() == "":
|
|
QMessageBox.information(self, self.tr("Create Point Distance Matrix"), self.tr("Please specify input unique ID field"))
|
|
elif self.inField2.currentText() == "":
|
|
QMessageBox.information(self, self.tr("Create Point Distance Matrix"), self.tr("Please specify target unique ID field"))
|
|
else:
|
|
point1 = self.inPoint1.currentText()
|
|
point2 = self.inPoint2.currentText()
|
|
field1 = self.inField1.currentText()
|
|
field2 = self.inField2.currentText()
|
|
outPath = self.outFile.text()
|
|
if self.rdoLinear.isChecked(): matType = "Linear"
|
|
elif self.rdoStandard.isChecked(): matType = "Standard"
|
|
else: matType = "Summary"
|
|
if self.chkNearest.isChecked(): nearest = self.spnNearest.value()
|
|
else: nearest = nearest = 0
|
|
if outPath.contains("\\"):
|
|
outName = outPath.right((outPath.length() - outPath.lastIndexOf("\\")) - 1)
|
|
else:
|
|
outName = outPath.right((outPath.length() - outPath.lastIndexOf("/")) - 1)
|
|
if outName.endsWith(".csv"):
|
|
outName = outName.left(outName.length() - 4)
|
|
self.outFile.clear()
|
|
self.compute(point1, point2, field1, field2, outPath, matType, nearest, self.progressBar)
|
|
self.progressBar.setValue(100)
|
|
addToTOC = QMessageBox.information(self, "Create Point Distance Matrix", self.tr("Created output matrix:\n") + outPath)
|
|
self.progressBar.setValue(0)
|
|
|
|
def saveFile(self):
|
|
self.outFile.clear()
|
|
fileDialog = QFileDialog()
|
|
outName = fileDialog.getSaveFileName(self, "Output Distance Matrix",".", "Delimited txt file (*.csv)")
|
|
fileCheck = QFile(outName)
|
|
filePath = QFileInfo(outName).absoluteFilePath()
|
|
if filePath.right(4) != ".csv": filePath = filePath + ".csv"
|
|
if not outName.isEmpty():
|
|
self.outFile.insert(filePath)
|
|
|
|
def compute(self, line1, line2, field1, field2, outPath, matType, nearest, progressBar):
|
|
layer1 = self.getVectorLayerByName(line1)
|
|
layer2 = self.getVectorLayerByName(line2)
|
|
provider1 = layer1.dataProvider()
|
|
provider2 = layer2.dataProvider()
|
|
allAttrs = provider1.attributeIndexes()
|
|
provider1.select(allAttrs)
|
|
allAttrs = provider2.attributeIndexes()
|
|
provider2.select(allAttrs)
|
|
sindex = QgsSpatialIndex()
|
|
inFeat = QgsFeature()
|
|
while provider2.nextFeature(inFeat):
|
|
sindex.insertFeature(inFeat)
|
|
provider2.rewind()
|
|
if nearest < 1: nearest = layer2.featureCount()
|
|
else: nearest = nearest + 1
|
|
index1 = provider1.fieldNameIndex(field1)
|
|
index2 = provider2.fieldNameIndex(field2)
|
|
sRs = provider1.crs()
|
|
distArea = QgsDistanceArea()
|
|
#use srs of the first layer (users should ensure that they are both in the same projection)
|
|
#distArea.setSourceSRS(sRs)
|
|
|
|
f = open(unicode(outPath), "wb")
|
|
writer = csv.writer(f)
|
|
if matType <> "Standard":
|
|
if matType == "Linear":
|
|
writer.writerow(["InputID", "TargetID", "Distance"])
|
|
else:
|
|
writer.writerow(["InputID", "MEAN", "STDDEV", "MIN", "MAX"])
|
|
self.linearMatrix(writer, provider1, provider2, index1, index2, nearest, distArea, matType, sindex, progressBar)
|
|
else:
|
|
self.regularMatrix(writer, provider1, provider2, index1, index2, nearest, distArea, sindex, progressBar)
|
|
f.close()
|
|
|
|
def regularMatrix(self, writer, provider1, provider2, index1, index2, nearest, distArea, sindex, progressBar):
|
|
inFeat = QgsFeature()
|
|
outFeat = QgsFeature()
|
|
inGeom = QgsGeometry()
|
|
outGeom = QgsGeometry()
|
|
first = True
|
|
start = 15.00
|
|
add = 85.00 / provider1.featureCount()
|
|
while provider1.nextFeature(inFeat):
|
|
inGeom = inFeat.geometry()
|
|
inID = inFeat.attributeMap()[index1].toString()
|
|
if first:
|
|
featList = sindex.nearestNeighbor(inGeom.asPoint(), nearest)
|
|
first = False
|
|
data = ["ID"]
|
|
for i in featList:
|
|
provider2.featureAtId(int(i), outFeat, True, [index2])
|
|
data.append(unicode(outFeat.attributeMap()[index2].toString()))
|
|
writer.writerow(data)
|
|
data = [unicode(inID)]
|
|
for j in featList:
|
|
provider2.featureAtId(int(j), outFeat, True)
|
|
outGeom = outFeat.geometry()
|
|
dist = distArea.measureLine(inGeom.asPoint(), outGeom.asPoint())
|
|
data.append(float(dist))
|
|
writer.writerow(data)
|
|
start = start + add
|
|
progressBar.setValue(start)
|
|
del writer
|
|
|
|
def linearMatrix(self, writer, provider1, provider2, index1, index2, nearest, distArea, matType, sindex, progressBar):
|
|
inFeat = QgsFeature()
|
|
outFeat = QgsFeature()
|
|
inGeom = QgsGeometry()
|
|
outGeom = QgsGeometry()
|
|
start = 15.00
|
|
add = 85.00 / provider1.featureCount()
|
|
while provider1.nextFeature(inFeat):
|
|
inGeom = inFeat.geometry()
|
|
inID = inFeat.attributeMap()[index1].toString()
|
|
featList = sindex.nearestNeighbor(inGeom.asPoint(), nearest)
|
|
distList = []
|
|
vari = 0.00
|
|
for i in featList:
|
|
provider2.featureAtId(int(i), outFeat, True, [index2])
|
|
outID = outFeat.attributeMap()[index2].toString()
|
|
outGeom = outFeat.geometry()
|
|
dist = distArea.measureLine(inGeom.asPoint(), outGeom.asPoint())
|
|
if dist > 0:
|
|
if matType == "Linear": writer.writerow([unicode(inID), unicode(outID), float(dist)])
|
|
else: distList.append(float(dist))
|
|
if matType == "Summary":
|
|
mean = sum(distList) / len(distList)
|
|
for i in distList:
|
|
vari = vari + ((i - mean)*(i - mean))
|
|
vari = sqrt(vari / len(distList))
|
|
writer.writerow([unicode(inID), float(mean), float(vari), float(min(distList)), float(max(distList))])
|
|
start = start + add
|
|
progressBar.setValue(start)
|
|
del writer
|
|
|
|
def getVectorLayerByName(self, myName):
|
|
mc = self.iface.mapCanvas()
|
|
nLayers = mc.layerCount()
|
|
for l in range(nLayers):
|
|
layer = mc.layer(l)
|
|
if layer.name() == unicode(myName):
|
|
vlayer = QgsVectorLayer(unicode(layer.source()), unicode(myName), unicode(layer.dataProvider().name()))
|
|
if vlayer.isValid():
|
|
return vlayer
|
|
else:
|
|
QMessageBox.information(self, self.tr("Locate Line Intersections"), self.tr("Vector layer is not valid"))
|
|
|
|
def getFieldList(self, vlayer):
|
|
fProvider = vlayer.dataProvider()
|
|
feat = QgsFeature()
|
|
allAttrs = fProvider.attributeIndexes()
|
|
fProvider.select(allAttrs)
|
|
myFields = fProvider.fields()
|
|
return myFields
|