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Dissolve.py
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Dissolve.py
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# -*- coding: utf-8 -*-
"""
***************************************************************************
Dissolve.py
---------------------
Date : Janaury 2015
Copyright : (C) 2015 by Giovanni Manghi
Email : giovanni dot manghi at naturalgis dot pt
***************************************************************************
* *
* 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. *
* *
***************************************************************************
"""
__author__ = 'Giovanni Manghi'
__date__ = 'January 2015'
__copyright__ = '(C) 2015, Giovanni Manghi'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
from qgis.core import (QgsProcessingException,
QgsProcessingParameterDefinition,
QgsProcessingParameterFeatureSource,
QgsProcessingParameterField,
QgsProcessingParameterString,
QgsProcessingParameterBoolean,
QgsProcessingParameterVectorDestination)
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from processing.algs.gdal.GdalUtils import GdalUtils
class Dissolve(GdalAlgorithm):
INPUT = 'INPUT'
FIELD = 'FIELD'
GEOMETRY = 'GEOMETRY'
EXPLODE_COLLECTIONS = 'EXPLODE_COLLECTIONS'
KEEP_ATTRIBUTES = 'KEEP_ATTRIBUTES'
COUNT_FEATURES = 'COUNT_FEATURES'
COMPUTE_AREA = 'COMPUTE_AREA'
COMPUTE_STATISTICS = 'COMPUTE_STATISTICS'
STATISTICS_ATTRIBUTE = 'STATISTICS_ATTRIBUTE'
OPTIONS = 'OPTIONS'
OUTPUT = 'OUTPUT'
def __init__(self):
super().__init__()
def initAlgorithm(self, config=None):
self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
self.tr('Input layer')))
self.addParameter(QgsProcessingParameterField(self.FIELD,
self.tr('Dissolve field'),
None,
self.INPUT,
QgsProcessingParameterField.Any, optional=True))
self.addParameter(QgsProcessingParameterString(self.GEOMETRY,
self.tr('Geometry column name'),
defaultValue='geometry'))
params = []
params.append(QgsProcessingParameterBoolean(self.EXPLODE_COLLECTIONS,
self.tr('Produce one feature for each geometry in any kind of geometry collection in the source file'),
defaultValue=False))
params.append(QgsProcessingParameterBoolean(self.KEEP_ATTRIBUTES,
self.tr('Keep input attributes'),
defaultValue=False))
params.append(QgsProcessingParameterBoolean(self.COUNT_FEATURES,
self.tr('Count dissolved features'),
defaultValue=False))
params.append(QgsProcessingParameterBoolean(self.COMPUTE_AREA,
self.tr('Compute area and perimeter of dissolved features'),
defaultValue=False))
params.append(QgsProcessingParameterBoolean(self.COMPUTE_STATISTICS,
self.tr('Compute min/max/sum/mean for attribute'),
defaultValue=False))
params.append(QgsProcessingParameterField(self.STATISTICS_ATTRIBUTE,
self.tr('Numeric attribute to calculate statistics on'),
None,
self.INPUT,
QgsProcessingParameterField.Numeric,
optional=True))
params.append(QgsProcessingParameterString(self.OPTIONS,
self.tr('Additional creation options'),
defaultValue='',
optional=True))
for param in params:
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.addParameter(param)
self.addParameter(QgsProcessingParameterVectorDestination(self.OUTPUT,
self.tr('Dissolved')))
def name(self):
return 'dissolve'
def displayName(self):
return self.tr('Dissolve')
def group(self):
return self.tr('Vector geoprocessing')
def groupId(self):
return 'vectorgeoprocessing'
def commandName(self):
return 'ogr2ogr'
def getConsoleCommands(self, parameters, context, feedback, executing=True):
source = self.parameterAsSource(parameters, self.INPUT, context)
if source is None:
raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
fields = source.fields()
ogrLayer, layerName = self.getOgrCompatibleSource(self.INPUT, parameters, context, feedback, executing)
geometry = self.parameterAsString(parameters, self.GEOMETRY, context)
fieldName = self.parameterAsString(parameters, self.FIELD, context)
options = self.parameterAsString(parameters, self.OPTIONS, context)
outFile = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
output, outputFormat = GdalUtils.ogrConnectionStringAndFormat(outFile, context)
other_fields = []
for f in fields:
if f.name() == geometry:
continue
other_fields.append(f.name())
if other_fields:
other_fields = ',*'
else:
other_fields = ''
arguments = []
arguments.append(output)
arguments.append(ogrLayer)
arguments.append('-nlt PROMOTE_TO_MULTI')
arguments.append('-dialect')
arguments.append('sqlite')
arguments.append('-sql')
tokens = []
if self.parameterAsBool(parameters, self.COUNT_FEATURES, context):
tokens.append("COUNT({}) AS count".format(geometry))
if self.parameterAsBool(parameters, self.COMPUTE_AREA, context):
tokens.append("SUM(ST_Area({0})) AS area, ST_Perimeter(ST_Union({0})) AS perimeter".format(geometry))
statsField = self.parameterAsString(parameters, self.STATISTICS_ATTRIBUTE, context)
if statsField and self.parameterAsBool(parameters, self.COMPUTE_STATISTICS, context):
tokens.append("SUM({0}) AS sum, MIN({0}) AS min, MAX({0}) AS max, AVG({0}) AS avg".format(statsField))
params = ','.join(tokens)
if params:
params = ', ' + params
group_by = ''
if fieldName:
group_by = ' GROUP BY {}'.format(fieldName)
if self.parameterAsBool(parameters, self.KEEP_ATTRIBUTES, context):
sql = "SELECT ST_Union({}) AS {}{}{} FROM '{}'{}".format(geometry, geometry, other_fields, params, layerName, group_by)
else:
sql = "SELECT ST_Union({}) AS {}{}{} FROM '{}'{}".format(geometry, geometry, ', ' + fieldName if fieldName else '',
params, layerName, group_by)
arguments.append(sql)
if self.parameterAsBool(parameters, self.EXPLODE_COLLECTIONS, context):
arguments.append('-explodecollections')
if options:
arguments.append(options)
if outputFormat:
arguments.append('-f {}'.format(outputFormat))
return [self.commandName(), GdalUtils.escapeAndJoin(arguments)]