135 lines
4.4 KiB
Python
135 lines
4.4 KiB
Python
#
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# Author: Cunren Liang
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# Copyright 2015-present, NASA-JPL/Caltech
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#
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import os
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import logging
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import numpy as np
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import isceobj
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from isceobj.Alos2Proc.Alos2ProcPublic import runCmd
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logger = logging.getLogger('isce.alos2insar.runCoherence')
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def runCoherence(self):
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'''estimate coherence
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'''
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if hasattr(self, 'doInSAR'):
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if not self.doInSAR:
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return
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catalog = isceobj.Catalog.createCatalog(self._insar.procDoc.name)
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self.updateParamemetersFromUser()
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#referenceTrack = self._insar.loadTrack(reference=True)
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#secondaryTrack = self._insar.loadTrack(reference=False)
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insarDir = 'insar'
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os.makedirs(insarDir, exist_ok=True)
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os.chdir(insarDir)
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numberRangeLooks = self._insar.numberRangeLooks1 * self._insar.numberRangeLooks2
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numberAzimuthLooks = self._insar.numberAzimuthLooks1 * self._insar.numberAzimuthLooks2
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#here we choose not to scale interferogram and amplitude
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#scaleAmplitudeInterferogram
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#if (numberRangeLooks >= 5) and (numberAzimuthLooks >= 5):
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if (numberRangeLooks * numberAzimuthLooks >= 9):
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cmd = "imageMath.py -e='sqrt(b_0*b_1);abs(a)/(b_0+(b_0==0))/(b_1+(b_1==0))*(b_0!=0)*(b_1!=0)' --a={} --b={} -o {} -t float -s BIL".format(
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self._insar.multilookDifferentialInterferogram,
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self._insar.multilookAmplitude,
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self._insar.multilookCoherence)
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runCmd(cmd)
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else:
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#estimate coherence using a moving window
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coherence(self._insar.multilookAmplitude, self._insar.multilookDifferentialInterferogram, self._insar.multilookCoherence,
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method="cchz_wave", windowSize=5)
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os.chdir('../')
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catalog.printToLog(logger, "runCoherence")
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self._insar.procDoc.addAllFromCatalog(catalog)
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from isceobj.Util.decorators import use_api
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@use_api
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def coherence(amplitudeFile, interferogramFile, coherenceFile, method="cchz_wave", windowSize=5):
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'''
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compute coherence using a window
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'''
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import operator
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from mroipac.correlation.correlation import Correlation
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CORRELATION_METHOD = {
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'phase_gradient' : operator.methodcaller('calculateEffectiveCorrelation'),
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'cchz_wave' : operator.methodcaller('calculateCorrelation')
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}
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ampImage = isceobj.createAmpImage()
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ampImage.load(amplitudeFile + '.xml')
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ampImage.setAccessMode('read')
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ampImage.createImage()
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intImage = isceobj.createIntImage()
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intImage.load(interferogramFile + '.xml')
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intImage.setAccessMode('read')
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intImage.createImage()
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#there is no coherence image in the isceobj/Image
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cohImage = isceobj.createOffsetImage()
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cohImage.setFilename(coherenceFile)
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cohImage.setWidth(ampImage.width)
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cohImage.setAccessMode('write')
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cohImage.createImage()
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cor = Correlation()
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cor.configure()
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cor.wireInputPort(name='amplitude', object=ampImage)
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cor.wireInputPort(name='interferogram', object=intImage)
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cor.wireOutputPort(name='correlation', object=cohImage)
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cor.windowSize = windowSize
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cohImage.finalizeImage()
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intImage.finalizeImage()
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ampImage.finalizeImage()
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try:
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CORRELATION_METHOD[method](cor)
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except KeyError:
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print("Unrecognized correlation method")
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sys.exit(1)
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pass
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return None
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def scaleAmplitudeInterferogram(amplitudeFile, interferogramFile, ratio=100000.0):
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'''
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scale amplitude and interferogram, and balace the two channels of amplitude image
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according to equation (2) in
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Howard A. Zebker and Katherine Chen, Accurate Estimation of Correlation in InSAR Observations
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IEEE GEOSCIENCE AND REMOTE SENSING LETTERS, VOL. 2, NO. 2, APRIL 2005.
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the operation of the program does not affect coherence estimation
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'''
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ampObj = isceobj.createImage()
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ampObj.load(amplitudeFile+'.xml')
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width = ampObj.width
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length = ampObj.length
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inf = np.fromfile(interferogramFile, dtype=np.complex64).reshape(length, width)
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amp = np.fromfile(amplitudeFile, dtype=np.complex64).reshape(length, width)
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flag = (inf!=0)*(amp.real!=0)*(amp.imag!=0)
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nvalid = np.sum(flag, dtype=np.float64)
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mpwr1 = np.sqrt(np.sum(amp.real * amp.real * flag, dtype=np.float64) / nvalid)
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mpwr2 = np.sqrt(np.sum(amp.imag * amp.imag * flag, dtype=np.float64) / nvalid)
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amp.real = amp.real / ratio
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amp.imag = amp.imag / ratio * mpwr1 / mpwr2
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inf = inf / ratio / ratio * mpwr1 / mpwr2
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amp.astype(np.complex64).tofile(inps.amp)
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inf.astype(np.complex64).tofile(inps.inf)
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