mirror of
https://github.com/qgis/QGIS.git
synced 2025-03-06 00:05:02 -05:00
8a84e134cc
Since it's safe to evaluate parameters in background threads now, it's usually going to be ok to evaluate everything in the processAlgorithm step. This keeps the algorithm code as simple as possible, and will make porting faster. Note that the prepare/postProcess virtual methods still exist and can be used when an algorithm MUST do setup/cleanup work in the main thread.
132 lines
6.1 KiB
Python
132 lines
6.1 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
ZonalStatistics.py
|
|
---------------------
|
|
Date : September 2016
|
|
Copyright : (C) 2016 by Alexander Bruy
|
|
Email : alexander dot bruy at gmail dot com
|
|
***************************************************************************
|
|
* *
|
|
* 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__ = 'Alexander Bruy'
|
|
__date__ = 'September 2016'
|
|
__copyright__ = '(C) 2016, Alexander Bruy'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
import os
|
|
from collections import OrderedDict
|
|
|
|
from qgis.PyQt.QtGui import QIcon
|
|
|
|
from qgis.analysis import QgsZonalStatistics
|
|
from qgis.core import (QgsFeatureSink,
|
|
QgsProcessingUtils,
|
|
QgsProcessingParameterDefinition,
|
|
QgsProcessingParameterVectorLayer,
|
|
QgsProcessingParameterRasterLayer,
|
|
QgsProcessingParameterString,
|
|
QgsProcessingParameterNumber,
|
|
QgsProcessingParameterEnum,
|
|
QgsProcessingOutputVectorLayer)
|
|
|
|
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
|
|
|
|
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
|
|
|
|
|
|
class ZonalStatistics(QgisAlgorithm):
|
|
|
|
INPUT_RASTER = 'INPUT_RASTER'
|
|
RASTER_BAND = 'RASTER_BAND'
|
|
INPUT_VECTOR = 'INPUT_VECTOR'
|
|
COLUMN_PREFIX = 'COLUMN_PREFIX'
|
|
STATISTICS = 'STATS'
|
|
|
|
def icon(self):
|
|
return QIcon(os.path.join(pluginPath, 'images', 'zonalstats.png'))
|
|
|
|
def group(self):
|
|
return self.tr('Raster tools')
|
|
|
|
def __init__(self):
|
|
super().__init__()
|
|
self.STATS = OrderedDict([(self.tr('Count'), QgsZonalStatistics.Count),
|
|
(self.tr('Sum'), QgsZonalStatistics.Sum),
|
|
(self.tr('Mean'), QgsZonalStatistics.Mean),
|
|
(self.tr('Median'), QgsZonalStatistics.Median),
|
|
(self.tr('Std. dev.'), QgsZonalStatistics.StDev),
|
|
(self.tr('Min'), QgsZonalStatistics.Min),
|
|
(self.tr('Max'), QgsZonalStatistics.Max),
|
|
(self.tr('Range'), QgsZonalStatistics.Range),
|
|
(self.tr('Minority'), QgsZonalStatistics.Minority),
|
|
(self.tr('Majority (mode)'), QgsZonalStatistics.Majority),
|
|
(self.tr('Variety'), QgsZonalStatistics.Variety),
|
|
(self.tr('Variance'), QgsZonalStatistics.Variance),
|
|
(self.tr('All'), QgsZonalStatistics.All)])
|
|
|
|
self.addParameter(QgsProcessingParameterRasterLayer(self.INPUT_RASTER,
|
|
self.tr('Raster layer')))
|
|
self.addParameter(QgsProcessingParameterNumber(self.RASTER_BAND,
|
|
self.tr('Raster band'),
|
|
minValue=1, maxValue=999, defaultValue=1))
|
|
self.addParameter(QgsProcessingParameterVectorLayer(self.INPUT_VECTOR,
|
|
self.tr('Vector layer containing zones'),
|
|
[QgsProcessingParameterDefinition.TypeVectorPolygon]))
|
|
self.addParameter(QgsProcessingParameterString(self.COLUMN_PREFIX,
|
|
self.tr('Output column prefix'), '_'))
|
|
keys = list(self.STATS.keys())
|
|
self.addParameter(QgsProcessingParameterEnum(self.STATISTICS,
|
|
self.tr('Statistics to calculate'),
|
|
keys,
|
|
allowMultiple=True, defaultValue=[0, 1, 2]))
|
|
self.addOutput(QgsProcessingOutputVectorLayer(self.INPUT_VECTOR,
|
|
self.tr('Zonal statistics'),
|
|
QgsProcessingParameterDefinition.TypeVectorPolygon))
|
|
|
|
self.bandNumber = None
|
|
self.columnPrefix = None
|
|
self.selectedStats = None
|
|
self.vectorLayer = None
|
|
self.rasterLayer = None
|
|
|
|
def name(self):
|
|
return 'zonalstatistics'
|
|
|
|
def displayName(self):
|
|
return self.tr('Zonal Statistics')
|
|
|
|
def prepareAlgorithm(self, parameters, context, feedback):
|
|
self.bandNumber = self.parameterAsInt(parameters, self.RASTER_BAND, context)
|
|
self.columnPrefix = self.parameterAsString(parameters, self.COLUMN_PREFIX, context)
|
|
st = self.parameterAsEnums(parameters, self.STATISTICS, context)
|
|
|
|
keys = list(self.STATS.keys())
|
|
self.selectedStats = 0
|
|
for i in st:
|
|
self.selectedStats |= self.STATS[keys[i]]
|
|
|
|
self.vectorLayer = self.parameterAsVectorLayer(parameters, self.INPUT_VECTOR, context)
|
|
self.rasterLayer = self.parameterAsRasterLayer(parameters, self.INPUT_RASTER, context)
|
|
return True
|
|
|
|
def processAlgorithm(self, parameters, context, feedback):
|
|
zs = QgsZonalStatistics(self.vectorLayer,
|
|
self.rasterLayer,
|
|
self.columnPrefix,
|
|
self.bandNumber,
|
|
QgsZonalStatistics.Statistics(self.selectedStats))
|
|
zs.calculateStatistics(feedback)
|
|
return {self.INPUT_VECTOR: self.vectorLayer}
|