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extractRasterBand.py
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# -*- coding: utf-8 -*-
"""
extractRasterBand.py
***************************************************************************
* *
* 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__ = 'Leandro França'
__date__ = '2020-12-15'
__copyright__ = '(C) 2020, Leandro França'
from PyQt5.QtCore import QCoreApplication, QVariant
from qgis.core import (QgsProcessing,
QgsFeatureSink,
QgsWkbTypes,
QgsFields,
QgsField,
QgsFeature,
QgsPointXY,
QgsGeometry,
QgsProcessingException,
QgsProcessingAlgorithm,
QgsProcessingParameterString,
QgsProcessingParameterField,
QgsProcessingParameterBoolean,
QgsProcessingParameterCrs,
QgsProcessingParameterEnum,
QgsFeatureRequest,
QgsExpression,
QgsProcessingParameterFeatureSource,
QgsProcessingParameterFeatureSink,
QgsProcessingParameterFileDestination,
QgsProcessingParameterRasterLayer,
QgsProcessingParameterBand,
QgsProcessingParameterRasterDestination,
QgsApplication,
QgsProject,
QgsRasterLayer,
QgsCoordinateTransform,
QgsCoordinateReferenceSystem)
import processing
import gdal
from osgeo import osr, gdal_array
class ExtractRasterBand(QgsProcessingAlgorithm):
LOC = QgsApplication.locale()
def translate(self, string):
return QCoreApplication.translate('Processing', string)
def tr(self, *string):
# Traduzir para o portugês: arg[0] - english (translate), arg[1] - português
if self.LOC == 'pt':
if len(string) == 2:
return string[1]
else:
return self.translate(string[0])
else:
return self.translate(string[0])
def createInstance(self):
return ExtractRasterBand()
def name(self):
return 'extractrasterband'
def displayName(self):
return self.tr('Extract Raster Band', 'Extrair banda de Raster')
def group(self):
return self.tr('LF Raster')
def groupId(self):
return 'lf_raster'
def tags(self):
return self.tr('bands,raster,extract,color,spectral,frequency,RGB,composite,channel').split(',')
def shortHelpString(self):
txt_en = 'Extracts a difined band of a raster (for multiband rasters).'
txt_pt = 'Extrai uma das bandas de um arquivo raster (para imagens multi-bandas/multi-canal).'
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'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', 'tweeter': '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', 'udemy': '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', 'youtube': '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'}
footer = '''<div align="right">
<p align="right"><b>'''+self.tr('Author: Leandro Franca', 'Autor: Leandro França')+'''</b></p>
<div align="right">
<a target="_blank" rel="noopener noreferrer" href="https://www.udemy.com/user/leandro-luiz-silva-de-franca/"><img title="Udemy" src="data:image/png;base64,'''+dic_BW['udemy']+'''"></a> <a target="_blank" rel="noopener noreferrer" href="https://www.facebook.com/GEOCAPT/"><img title="Facebook" src="data:image/png;base64,'''+dic_BW['face']+'''"></a> <a target="_blank" rel="noopener noreferrer" href="https://www.youtube.com/channel/UCLrewDGciytcBG9r0OxTW2w"><img title="Youtube" src="data:image/png;base64,'''+dic_BW['youtube']+'''"></a> <a target="_blank" rel="noopener noreferrer" href="https://www.researchgate.net/profile/Leandro_Franca2"><img title="ResearchGate" src="data:image/png;base64,'''+dic_BW['RG']+'''"></a> <a target="_blank" rel="noopener noreferrer" href="https://github.com/LEOXINGU"><img title="GitHub" src="data:image/png;base64,'''+dic_BW['github']+'''"></a> <a target="_blank" rel="noopener noreferrer" href="https://www.linkedin.com/in/leandro-fran%C3%A7a-93093714b/"><img title="Linkedin" src="data:image/png;base64,'''+dic_BW['linkedin']+'''"></a> <a target="_blank" rel="noopener noreferrer" href="http://lattes.cnpq.br/8559852745183879"><img title="Lattes" src="data:image/png;base64,'''+dic_BW['lattes']+'''"></a>
</div>
</div>'''
if self.LOC == 'pt':
return txt_pt + footer
else:
return self.tr(txt_en) + footer
INPUT = 'INPUT'
BAND = 'BAND'
OUTPUT = 'OUTPUT'
OPEN = 'OPEN'
def initAlgorithm(self, config=None):
# INPUT
self.addParameter(
QgsProcessingParameterRasterLayer(
self.INPUT,
self.tr('Multiband Input Raster', 'Raster multibandas'),
[QgsProcessing.TypeRaster]
)
)
self.addParameter(
QgsProcessingParameterBand(
self.BAND,
self.tr('Band number', 'Número da banda'),
parentLayerParameterName=self.INPUT,
)
)
# OUTPUT
self.addParameter(
QgsProcessingParameterFileDestination(
self.OUTPUT,
self.tr('Selected band', 'Banda selecionada'),
fileFilter = '.tif'
)
)
self.addParameter(
QgsProcessingParameterBoolean(
self.OPEN,
self.tr('Load output raster', 'Carregar raster de saída'),
defaultValue= True
)
)
def processAlgorithm(self, parameters, context, feedback):
entrada = self.parameterAsRasterLayer(
parameters,
self.INPUT,
context
)
if entrada is None:
raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
n_banda = self.parameterAsInt(
parameters,
self.BAND,
context
)
if n_banda is None:
raise QgsProcessingException(self.invalidSourceError(parameters, self.BAND))
saida = self.parameterAsFileOutput(
parameters,
self.OUTPUT,
context
)
Carregar = self.parameterAsBool(
parameters,
self.OPEN,
context
)
# Abrir banda
feedback.pushInfo(self.tr('Reading the selected band...', 'Lendo a banda selecionada...'))
image = gdal.Open(entrada.dataProvider().dataSourceUri())
banda = image.GetRasterBand(n_banda).ReadAsArray()
prj=image.GetProjection()
geotransform = image.GetGeoTransform()
# Criar objeto CRS
CRS=osr.SpatialReference(wkt=prj)
# Obter número de linhas e colunas
cols = image.RasterXSize
rows = image.RasterYSize
image=None # fechar magem
# Pegar tipo de dado do array
GDT = gdal_array.NumericTypeCodeToGDALTypeCode(banda.dtype)
# Criar imagem com uma única banda
feedback.pushInfo(self.tr('Writing the selected band...', 'Escrevendo a banda selecionada...'))
nova_imagem = gdal.GetDriverByName('GTiff').Create(saida, cols, rows, 1, GDT)
nova_imagem.SetGeoTransform(geotransform)
nova_imagem.SetProjection(CRS.ExportToWkt())
nova_imagem.GetRasterBand(1).WriteArray(banda)
nova_imagem.FlushCache() # Escrever no disco
nova_imagem = None # Salvar e fechar
CRS = None
feedback.pushInfo(self.tr('Operation completed successfully!', 'Operação finalizada com sucesso!'))
feedback.pushInfo('Leandro França - Eng Cart')
self.CAMINHO = saida
self.CARREGAR = Carregar
return {self.OUTPUT: saida}
def postProcessAlgorithm(self, context, feedback):
if self.CARREGAR:
rlayer = QgsRasterLayer(self.CAMINHO, self.tr('Extracted band', 'Banda extraída'))
QgsProject.instance().addMapLayer(rlayer)
return {}