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QuickNDVI.py
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QuickNDVI.py
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# -*- coding: utf-8 -*-
from osgeo import gdal, osr
import sys
import numpy as np
from qgis.PyQt.QtCore import QCoreApplication, QVariant
from qgis.core import (QgsProcessing, QgsProcessingAlgorithm,
QgsProcessingParameterRasterLayer,QgsProcessingParameterEnum,
QgsProcessingParameterRasterDestination, QgsMessageLog)
class RasterAlg(QgsProcessingAlgorithm):
INPUT_RASTER = 'INPUT_RASTER'
INPUT_MODE = 'INPUT_MODE'
OUTPUT_RASTER = 'OUTPUT_RASTER'
def __init__(self):
super().__init__()
def name(self):
return "MIERUNE"
def tr(self, text):
return QCoreApplication.translate("MIERUNE", text)
#スクリプト名、グループ名、スクリプトの概要、ヘルプのリンク先
#the name of script, group, helpURL
def displayName(self):
return self.tr("QuickNDVI Script")
def group(self):
return self.tr("MIERUNE")
def groupId(self):
return "MIERUNE"
def shortHelpString(self):
return self.tr("QuickNDVI Script for satelite image")
def helpUrl(self):
return "https://www.mierune.co.jp"
#Create the window for the parameters(input raster file, index, output raster file)
#パラメータ入力画面の作成（入力画像名、指数、出力画像名）
def createInstance(self):
return type(self)()
def initAlgorithm(self, config=None):
self.addParameter(QgsProcessingParameterRasterLayer(
self.INPUT_RASTER,
self.tr("Input Raster"), None, False))
#指数の選択
#インフラデータチャレンジの審査（2019/04）までに全ての指数を選択可能なコードに書き換えること
# ["NDVI", "MSAVI", "VARI", "BAI"],
self.addParameter(QgsProcessingParameterEnum(
self.INPUT_MODE,
self.tr("MODE"),
["NDVI","MSAVI","VARI","BAI"],
False, None, False)
)
self.addParameter(QgsProcessingParameterRasterDestination(
self.OUTPUT_RASTER,
self.tr("Output Raster"),
None, False))
#パラメーターの変数への受け渡し
#pass the parameters to variables
def processAlgorithm(self, parameters, context, feedback):
raster = self.parameterAsRasterLayer(parameters, self.INPUT_RASTER, context)
mode_str = self.parameterAsString(parameters, self.INPUT_MODE,context)
output_raster_path = self.parameterAsOutputLayer(parameters, self.OUTPUT_RASTER, context)
#計算の実行
#DO SOME CALCULATION
QgsMessageLog.logMessage("Operation started")
srcRas, srcArray, width, height, nodata = self.get_band_array(raster.dataProvider().dataSourceUri())
QgsMessageLog.logMessage(str(srcArray[0]))
dstArray = self.calculate(mode_str, srcArray)
self.write_array(output_raster_path, mode_str, srcRas, width, height, nodata, dstArray)
results = {}
results[self.OUTPUT_RASTER] = output_raster_path
return results
#ラスターを開いて4バンドを取得、配列の計算を実行
#Open raster file, get the 4 bands and calculate the arrays
def get_band_array(self, src):
QgsMessageLog.logMessage("Get the bands and array")
srcRas = gdal.Open(src, gdal.GA_ReadOnly)
if srcRas.RasterCount != 4:
QgsMessageLog.logMessage("Not enough bands")
sys.exit()
srcBand = []
srcArray =[]
nodata = []
for i in [1,2,3,4]:
srcBand.append(srcRas.GetRasterBand(i))
nodata.append(srcBand[i-1].GetNoDataValue())
srcArray.append(np.ma.masked_equal(srcBand[i-1].ReadAsArray(), nodata[i-1]).astype(np.float32))
srcArray_str = str(srcArray)
QgsMessageLog.logMessage(srcArray_str)
src = None
width = srcArray[i-1].shape[1]
height = srcArray[i-1].shape[0]
return srcRas, srcArray, width, height, nodata
#指数の計算
#calculate the index
def calculate(self, mode_str, srcArray):
QgsMessageLog.logMessage("Calculate the index")
QgsMessageLog.logMessage(mode_str)
#NDVI
if mode_str == "0":
NDVI_numerator = srcArray[3]-srcArray[2]
NDVI_denominator = srcArray[3]+srcArray[2]
dstArray = NDVI_numerator/NDVI_denominator
#MSAVI
elif mode_str == "1":
pre_MSAVI_1 = 2*(srcArray[3]+1)
pre_MSAVI_2 = (srcArray[3]*2+1)**2
pre_MSAVI_3 = 8*(srcArray[3]-srcArray[2])
dstArray = (pre_MSAVI_1-np.sqrt(pre_MSAVI_2-pre_MSAVI_3))/2
#VARI
elif mode_str == "2":
VARI_numerator = srcArray[1]-srcArray[2]
VARI_denominator = srcArray[1]+srcArray[2]-srcArray[0]
dstArray = VARI_numerator/VARI_denominator
#BAI
elif mode_str == "3":
pre_BAI_1 = (0.1-srcArray[0])**2
pre_BAI_2 = (0.06-srcArray[3])**2
dstArray = 1/(pre_BAI_1 + pre_BAI_2)
dstArray_str = str(dstArray)
QgsMessageLog.logMessage(dstArray_str)
return dstArray
#出力画像の作成
#create the output raster file
def write_array(self, output_raster_path, mode_str, srcRas, width, height, nodata, dstArray):
QgsMessageLog.logMessage("Create the raster file and write the array into it")
dstType = gdal.GDT_Float32
geotransform = srcRas.GetGeoTransform()
originX = geotransform[0]
originY = geotransform[3]
pixelWidth = geotransform[1]
pixelHeight = geotransform[5]
driver = gdal.GetDriverByName('GTiff')
dstRas = driver.Create(output_raster_path, width, height, 1, dstType)
dstRas.SetGeoTransform((originX, pixelWidth, 0, originY, 0, pixelHeight))
dstBand = dstRas.GetRasterBand(1)
dstBand.WriteArray(dstArray)
if nodata[0]:
dstBand.SetNoDataValue(nodata[0])
dstBand.FlushCache()
dstRas = None
srcFirst = None