-
-
Notifications
You must be signed in to change notification settings - Fork 3k
/
RasterCalculator.py
165 lines (140 loc) · 7.49 KB
/
RasterCalculator.py
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
# -*- coding: utf-8 -*-
"""
***************************************************************************
RasterLayerCalculator.py
---------------------
Date : November 2016
Copyright : (C) 2016 by Victor Olaya
Email : volayaf 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. *
* *
***************************************************************************
"""
from processing.modeler.ModelerAlgorithm import ValueFromInput, ValueFromOutput
import os
__author__ = 'Victor Olaya'
__date__ = 'November 2016'
__copyright__ = '(C) 2016, Victor Olaya'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
import math
from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.core.parameters import ParameterMultipleInput, ParameterExtent, ParameterString, ParameterRaster, ParameterNumber
from processing.core.outputs import OutputRaster
from processing.tools import dataobjects
from processing.algs.gdal.GdalUtils import GdalUtils
from qgis.core import QgsRectangle
from qgis.analysis import QgsRasterCalculator, QgsRasterCalculatorEntry
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
from processing.algs.qgis.ui.RasterCalculatorWidgets import LayersListWidgetWrapper, ExpressionWidgetWrapper
class RasterCalculator(GeoAlgorithm):
LAYERS = 'LAYERS'
EXTENT = 'EXTENT'
CELLSIZE = 'CELLSIZE'
EXPRESSION = 'EXPRESSION'
OUTPUT = 'OUTPUT'
def defineCharacteristics(self):
self.name, self.i18n_name = self.trAlgorithm('Raster calculator')
self.group, self.i18n_group = self.trAlgorithm('Raster')
self.addParameter(ParameterMultipleInput(self.LAYERS,
self.tr('Input layers'),
datatype=dataobjects.TYPE_RASTER,
optional=True,
metadata={'widget_wrapper': LayersListWidgetWrapper}))
class ParameterRasterCalculatorExpression(ParameterString):
def evaluateForModeler(self, value, model):
for i in list(model.inputs.values()):
param = i.param
if isinstance(param, ParameterRaster):
new = "{}@".format(os.path.basename(param.value))
old = "{}@".format(param.name)
value = value.replace(old, new)
for alg in list(model.algs.values()):
for out in alg.algorithm.outputs:
if isinstance(out, OutputRaster):
if out.value:
new = "{}@".format(os.path.basename(out.value))
old = "{}:{}@".format(alg.name, out.name)
value = value.replace(old, new)
return value
self.addParameter(ParameterRasterCalculatorExpression(self.EXPRESSION, self.tr('Expression'),
multiline=True,
metadata={'widget_wrapper': ExpressionWidgetWrapper}))
self.addParameter(ParameterNumber(self.CELLSIZE,
self.tr('Cell size (use 0 or empty to set it automatically)'),
minValue=0.0, default=0.0, optional=True))
self.addParameter(ParameterExtent(self.EXTENT,
self.tr('Output extent'),
optional=True))
self.addOutput(OutputRaster(self.OUTPUT, self.tr('Output')))
def processAlgorithm(self, progress):
expression = self.getParameterValue(self.EXPRESSION)
layersValue = self.getParameterValue(self.LAYERS)
layersDict = {}
if layersValue:
layers = [dataobjects.getObjectFromUri(f) for f in layersValue.split(";")]
layersDict = {os.path.basename(lyr.source().split(".")[0]): lyr for lyr in layers}
for lyr in dataobjects.getRasterLayers():
name = lyr.name()
if (name + "@") in expression:
layersDict[name] = lyr
entries = []
for name, lyr in layersDict.items():
for n in range(lyr.bandCount()):
entry = QgsRasterCalculatorEntry()
entry.ref = '{:s}@{:d}'.format(name, n + 1)
entry.raster = lyr
entry.bandNumber = n + 1
entries.append(entry)
output = self.getOutputValue(self.OUTPUT)
extentValue = self.getParameterValue(self.EXTENT)
if extentValue:
extent = extentValue.split(',')
bbox = QgsRectangle(float(extent[0]), float(extent[2]),
float(extent[1]), float(extent[3]))
else:
if layersDict:
bbox = list(layersDict.values())[0].extent()
for lyr in layersDict.values():
bbox.combineExtentWith(lyr.extent())
else:
raise GeoAlgorithmExecutionException(self.tr("No layers selected"))
def _cellsize(layer):
return (layer.extent().xMaximum() - layer.extent().xMinimum()) / layer.width()
cellsize = self.getParameterValue(self.CELLSIZE) or min([_cellsize(lyr) for lyr in layersDict.values()])
width = math.floor((bbox.xMaximum() - bbox.xMinimum()) / cellsize)
height = math.floor((bbox.yMaximum() - bbox.yMinimum()) / cellsize)
driverName = GdalUtils.getFormatShortNameFromFilename(output)
calc = QgsRasterCalculator(expression,
output,
driverName,
bbox,
width,
height,
entries)
res = calc.processCalculation()
if res == QgsRasterCalculator.ParserError:
raise GeoAlgorithmExecutionException(self.tr("Error parsing formula"))
def processBeforeAddingToModeler(self, algorithm, model):
values = []
expression = algorithm.params[self.EXPRESSION]
for i in list(model.inputs.values()):
param = i.param
if isinstance(param, ParameterRaster) and "{}@".format(param.name) in expression:
values.append(ValueFromInput(param.name))
if algorithm.name:
dependent = model.getDependentAlgorithms(algorithm.name)
else:
dependent = []
for alg in list(model.algs.values()):
if alg.name not in dependent:
for out in alg.algorithm.outputs:
if (isinstance(out, OutputRaster)
and "{}:{}@".format(alg.name, out.name) in expression):
values.append(ValueFromOutput(alg.name, out.name))
algorithm.params[self.LAYERS] = values