121 lines
4.0 KiB
Python
121 lines
4.0 KiB
Python
#
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# Author: Piyush Agram
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# Copyright 2016
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#
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import logging
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import isceobj
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import os
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from isceobj.Constants import SPEED_OF_LIGHT
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import numpy as np
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logger = logging.getLogger('isce.scansarinsar.runCommonRangeSpectra')
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def createVirtualCopy(infile, outfile):
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'''
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Create a virtual copy as is.
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'''
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from osgeo import gdal
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import shutil
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ds = gdal.Open(infile + '.vrt', gdal.GA_ReadOnly)
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width = ds.RasterXSize
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lgth = ds.RasterYSize
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ds = None
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img = isceobj.createSlcImage()
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img.setWidth(width)
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img.setLength(lgth)
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img.setAccessMode('READ')
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img.setFilename(outfile)
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img.renderHdr()
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##Copy VRT as is
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shutil.copyfile( infile + '.vrt', outfile + '.vrt')
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def runCommonRangeSpectra(self):
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'''Align central frequencies and pixel sizes.
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'''
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swathList = self._insar.getValidSwathList(self.swaths)
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catalog = isceobj.Catalog.createCatalog(self._insar.procDoc.name)
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print('Common swaths: ', swathList)
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for ind, swath in enumerate(swathList):
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##Load master swath
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master = self._insar.loadProduct( os.path.join(self._insar.masterSlcProduct,
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's{0}.xml'.format(swath)))
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##Load slave swath
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slave = self._insar.loadProduct( os.path.join(self._insar.slaveSlcProduct,
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's{0}.xml'.format(swath)))
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##Check for overlap frequency
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centerfreq1 = SPEED_OF_LIGHT / master.radarWavelegth
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bandwidth1 = np.abs( master.instrument.pulseLength * master.instrument.chirpSlope)
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centerfreq2 = SPEED_OF_LIGHT / slave.radarWavelegth
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bandwidth2 = np.abs( slave.instrument.pulseLength * slave.instrument.chirpSlope)
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overlapfreq = self._insar.getOverlapFrequency(centerfreq1, bandwidth1,
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centerfreq2, bandwidth2)
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if (overlapfreq is None):
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print('No range bandwidth overlap found for swath {0}'.format(swath))
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raise Exception('No range spectra overlap')
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overlapbw = overlapfreq[1] - overlapfreq[0]
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print('Range spectra overlap for swath {0} : {1}'.format(swath, overlapbw))
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if overlapbw < self._insar.rangeSpectraOverlapThreshold:
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raise Exception('Not enough range spectra overlap for swath {0}'.format(swath))
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centerfreq = 0.5 * (centerfreq1 + centerfreq2)
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###Check if master needs range filtering
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if (np.abs(centerfreq1 - centerfreq) < 1.0) and ((bandwidth1 - 1.0) < overlapbw):
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print('No need to range filter master slc for swath {0}'.format(swath))
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infile = master.image.filename
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outfile = os.path.join(self._insar.commonRangeSpectraSlcDirectory,
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os.path.sep.join(infile.split(os.path.sep)[-4:]))
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os.makedirs( os.path.dirname(outfile))
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createVirtualCopy(infile, outfile)
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##Generate product
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master.image.filename = outfile
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self._insar.saveProduct(master, os.path.dirname(outfile) + '.xml')
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else:
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raise NotImplementedError('This feature will be available after porting rg_filter')
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###Check if slave needs range filtering
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if (np.abs(centerfreq2 - centerfreq) < 1.0) and ((bandwidth2 - 1.0) < overlapbw):
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print('No need to range filter slave slc for swath {0}'.format(swath))
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infile = slave.image.filename
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outfile = os.path.join(self._insar.commonRangeSpectraSlcDirectory,
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os.path.sep.join(infile.split(os.path.sep)[-4:]))
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os.makedirs( os.path.dirname(outfile))
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createVirtualCopy(infile, outfile)
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##Generate product
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slave.image.filename = outfile
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self._insar.saveProduct(slave, os.path.dirname(outfile) + '.xml')
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else:
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raise NotImplementedError('This feature will be available after porting rg_filter')
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catalog.printToLog(logger, "runCommonRangeSpectra")
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self._insar.procDoc.addAllFromCatalog(catalog)
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