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#!/usr/bin/env python3
import os
import sys
import argparse
import datetime
import numpy as np
import isce
import isceobj
import s1a_isce_utils as ut
def createParser():
parser = argparse.ArgumentParser( description='Generate offset field between two Sentinel swaths')
# inputs
parser.add_argument('-m', '--reference', type=str, dest='reference', required=True,
help='Directory with the reference image')
parser.add_argument('-s', '--secondary', type=str, dest='secondary', required=True,
help='Directory with the secondary image')
parser.add_argument('-g', '--geom_referenceDir', type=str, dest='geom_referenceDir', default='geom_reference',
help='Directory for geometry files of the reference')
parser.add_argument('-a', '--azimuth_misreg', type=str, dest='misreg_az', default='',
help='A text file that contains zimuth misregistration in subpixels')
parser.add_argument('-r', '--range_misreg', type=str, dest='misreg_rng', default='',
help='A text file that contains range misregistration in meters')
parser.add_argument('-useGPU', '--useGPU', dest='useGPU',action='store_true', default=False,
help='Allow App to use GPU when available')
# outputs
parser.add_argument('-c', '--coregSLCdir', type=str, dest='coregdir', default='coreg_secondarys',
help='Directory with coregistered SLC data, to store the generated azimuth/range_*.off files.')
parser.add_argument('-v', '--overlap', dest='overlap', action='store_true', default=False,
help='Flatten the interferograms with offsets if needed')
parser.add_argument('-o', '--overlap_dir', type=str, dest='overlapDir', default='overlap',
help='overlap directory name')
return parser
def cmdLineParse(iargs=None):
'''
Command line parser.
'''
parser = createParser()
return parser.parse_args(args=iargs)
def runGeo2rdrCPU(info, rdict, misreg_az=0.0, misreg_rg=0.0):
from zerodop.geo2rdr import createGeo2rdr
from isceobj.Planet.Planet import Planet
latImage = isceobj.createImage()
latImage.load(rdict['lat'] + '.xml')
latImage.setAccessMode('READ')
lonImage = isceobj.createImage()
lonImage.load(rdict['lon'] + '.xml')
lonImage.setAccessMode('READ')
demImage = isceobj.createImage()
demImage.load(rdict['hgt'] + '.xml')
demImage.setAccessMode('READ')
misreg_az = misreg_az*info.azimuthTimeInterval
delta = datetime.timedelta(seconds=misreg_az)
print('Additional time offset applied in geo2rdr: {0} secs'.format(misreg_az))
print('Additional range offset applied in geo2rdr: {0} m'.format(misreg_rg))
#####Run Geo2rdr
planet = Planet(pname='Earth')
grdr = createGeo2rdr()
grdr.configure()
grdr.slantRangePixelSpacing = info.rangePixelSize
grdr.prf = 1.0 / info.azimuthTimeInterval
grdr.radarWavelength = info.radarWavelength
grdr.orbit = info.orbit
grdr.width = info.numberOfSamples
grdr.length = info.numberOfLines
grdr.demLength = demImage.getLength()
grdr.demWidth = demImage.getWidth()
grdr.wireInputPort(name='planet', object=planet)
grdr.numberRangeLooks = 1
grdr.numberAzimuthLooks = 1
grdr.lookSide = -1
grdr.setSensingStart(info.sensingStart - delta)
grdr.rangeFirstSample = info.startingRange - misreg_rg
grdr.dopplerCentroidCoeffs = [0.] ###Zero doppler
grdr.rangeOffsetImageName = rdict['rangeOffName']
grdr.azimuthOffsetImageName = rdict['azOffName']
grdr.demImage = demImage
grdr.latImage = latImage
grdr.lonImage = lonImage
grdr.geo2rdr()
return
def runGeo2rdrGPU(info, rdict, misreg_az=0.0, misreg_rg=0.0):
from zerodop.GPUgeo2rdr.GPUgeo2rdr import PyGeo2rdr
from isceobj.Planet.Planet import Planet
from iscesys import DateTimeUtil as DTU
latImage = isceobj.createImage()
latImage.load(rdict['lat'] + '.xml')
latImage.setAccessMode('READ')
latImage.createImage()
lonImage = isceobj.createImage()
lonImage.load(rdict['lon'] + '.xml')
lonImage.setAccessMode('READ')
lonImage.createImage()
demImage = isceobj.createImage()
demImage.load(rdict['hgt'] + '.xml')
demImage.setAccessMode('READ')
demImage.createImage()
misreg_az = misreg_az*info.azimuthTimeInterval
delta = datetime.timedelta(seconds=misreg_az)
print('Additional time offset applied in geo2rdr: {0} secs'.format(misreg_az))
print('Additional range offset applied in geo2rdr: {0} m'.format(misreg_rg))
#####Run Geo2rdr
planet = Planet(pname='Earth')
grdr = PyGeo2rdr()
grdr.setRangePixelSpacing(info.rangePixelSize)
grdr.setPRF(1.0 / info.azimuthTimeInterval)
grdr.setRadarWavelength(info.radarWavelength)
grdr.createOrbit(0, len(info.orbit.stateVectors.list))
count = 0
for sv in info.orbit.stateVectors.list:
td = DTU.seconds_since_midnight(sv.getTime())
pos = sv.getPosition()
vel = sv.getVelocity()
grdr.setOrbitVector(count, td, pos[0], pos[1], pos[2], vel[0], vel[1], vel[2])
count += 1
grdr.setOrbitMethod(0)
grdr.setWidth(info.numberOfSamples)
grdr.setLength(info.numberOfLines)
grdr.setSensingStart(DTU.seconds_since_midnight(info.sensingStart -delta))
grdr.setRangeFirstSample(info.startingRange - misreg_rg)
grdr.setNumberRangeLooks(1)
grdr.setNumberAzimuthLooks(1)
grdr.setEllipsoidMajorSemiAxis(planet.ellipsoid.a)
grdr.setEllipsoidEccentricitySquared(planet.ellipsoid.e2)
grdr.createPoly(0, 0., 1.)
grdr.setPolyCoeff(0, 0.)
grdr.setDemLength(demImage.getLength())
grdr.setDemWidth(demImage.getWidth())
grdr.setBistaticFlag(0)
rangeOffsetImage = isceobj.createImage()
rangeOffsetImage.setFilename(rdict['rangeOffName'])
rangeOffsetImage.setAccessMode('write')
rangeOffsetImage.setDataType('FLOAT')
rangeOffsetImage.setCaster('write', 'DOUBLE')
rangeOffsetImage.setWidth(demImage.width)
rangeOffsetImage.createImage()
azimuthOffsetImage = isceobj.createImage()
azimuthOffsetImage.setFilename(rdict['azOffName'])
azimuthOffsetImage.setAccessMode('write')
azimuthOffsetImage.setDataType('FLOAT')
azimuthOffsetImage.setCaster('write', 'DOUBLE')
azimuthOffsetImage.setWidth(demImage.width)
azimuthOffsetImage.createImage()
grdr.setLatAccessor(latImage.getImagePointer())
grdr.setLonAccessor(lonImage.getImagePointer())
grdr.setHgtAccessor(demImage.getImagePointer())
grdr.setAzAccessor(0)
grdr.setRgAccessor(0)
grdr.setAzOffAccessor(azimuthOffsetImage.getImagePointer())
grdr.setRgOffAccessor(rangeOffsetImage.getImagePointer())
grdr.geo2rdr()
rangeOffsetImage.finalizeImage()
rangeOffsetImage.renderHdr()
azimuthOffsetImage.finalizeImage()
azimuthOffsetImage.renderHdr()
latImage.finalizeImage()
lonImage.finalizeImage()
demImage.finalizeImage()
return
def main(iargs=None):
'''
Estimate offsets for (the overlap regions of) the bursts.
'''
inps = cmdLineParse(iargs)
# see if the user compiled isce with GPU enabled
run_GPU = False
try:
from zerodop.GPUtopozero.GPUtopozero import PyTopozero
from zerodop.GPUgeo2rdr.GPUgeo2rdr import PyGeo2rdr
run_GPU = True
except:
pass
if inps.useGPU and not run_GPU:
print("GPU mode requested but no GPU ISCE code found")
# setting the respective version of geo2rdr for CPU and GPU
if run_GPU and inps.useGPU:
print('GPU mode')
runGeo2rdr = runGeo2rdrGPU
else:
print('CPU mode')
runGeo2rdr = runGeo2rdrCPU
referenceSwathList = ut.getSwathList(inps.reference)
secondarySwathList = ut.getSwathList(inps.secondary)
swathList = list(sorted(set(referenceSwathList + secondarySwathList)))
for swath in swathList:
##Load secondary metadata
secondary = ut.loadProduct(os.path.join(inps.secondary, 'IW{0}.xml'.format(swath)))
reference = ut.loadProduct(os.path.join(inps.reference, 'IW{0}.xml'.format(swath)))
### output directory
if inps.overlap:
outdir = os.path.join(inps.coregdir, inps.overlapDir, 'IW{0}'.format(swath))
else:
outdir = os.path.join(inps.coregdir, 'IW{0}'.format(swath))
os.makedirs(outdir, exist_ok=True)
if os.path.exists(str(inps.misreg_az)):
with open(inps.misreg_az, 'r') as f:
misreg_az = float(f.readline())
else:
misreg_az = 0.0
if os.path.exists(str(inps.misreg_rng)):
with open(inps.misreg_rng, 'r') as f:
misreg_rg = float(f.readline())
else:
misreg_rg = 0.0
burstoffset, minBurst, maxBurst = reference.getCommonBurstLimits(secondary)
###Burst indices w.r.t reference
if inps.overlap:
maxBurst = maxBurst - 1
geomDir = os.path.join(inps.geom_referenceDir, inps.overlapDir, 'IW{0}'.format(swath))
else:
geomDir = os.path.join(inps.geom_referenceDir, 'IW{0}'.format(swath))
secondaryBurstStart = minBurst + burstoffset
for mBurst in range(minBurst, maxBurst):
###Corresponding secondary burst
sBurst = secondaryBurstStart + (mBurst - minBurst)
burstTop = secondary.bursts[sBurst]
if inps.overlap:
burstBot = secondary.bursts[sBurst+1]
print('Overlap pair {0}: Burst {1} of reference matched with Burst {2} of secondary'.format(mBurst-minBurst, mBurst, sBurst))
if inps.overlap:
####Generate offsets for top burst
rdict = {'lat': os.path.join(geomDir,'lat_%02d_%02d.rdr'%(mBurst+1,mBurst+2)),
'lon': os.path.join(geomDir,'lon_%02d_%02d.rdr'%(mBurst+1,mBurst+2)),
'hgt': os.path.join(geomDir,'hgt_%02d_%02d.rdr'%(mBurst+1,mBurst+2)),
'rangeOffName': os.path.join(outdir, 'range_top_%02d_%02d.off'%(mBurst+1,mBurst+2)),
'azOffName': os.path.join(outdir, 'azimuth_top_%02d_%02d.off'%(mBurst+1,mBurst+2))}
runGeo2rdr(burstTop, rdict, misreg_az=misreg_az, misreg_rg=misreg_rg)
print('Overlap pair {0}: Burst {1} of reference matched with Burst {2} of secondary'.format(mBurst-minBurst, mBurst+1, sBurst+1))
####Generate offsets for bottom burst
rdict = {'lat': os.path.join(geomDir,'lat_%02d_%02d.rdr'%(mBurst+1,mBurst+2)),
'lon': os.path.join(geomDir, 'lon_%02d_%02d.rdr'%(mBurst+1,mBurst+2)),
'hgt': os.path.join(geomDir, 'hgt_%02d_%02d.rdr'%(mBurst+1,mBurst+2)),
'rangeOffName': os.path.join(outdir, 'range_bot_%02d_%02d.off'%(mBurst+1,mBurst+2)),
'azOffName': os.path.join(outdir, 'azimuth_bot_%02d_%02d.off'%(mBurst+1,mBurst+2))}
runGeo2rdr(burstBot, rdict, misreg_az=misreg_az, misreg_rg=misreg_rg)
else:
print('Burst {1} of reference matched with Burst {2} of secondary'.format(mBurst-minBurst, mBurst, sBurst))
####Generate offsets for top burst
rdict = {'lat': os.path.join(geomDir,'lat_%02d.rdr'%(mBurst+1)),
'lon': os.path.join(geomDir,'lon_%02d.rdr'%(mBurst+1)),
'hgt': os.path.join(geomDir,'hgt_%02d.rdr'%(mBurst+1)),
'rangeOffName': os.path.join(outdir, 'range_%02d.off'%(mBurst+1)),
'azOffName': os.path.join(outdir, 'azimuth_%02d.off'%(mBurst+1))}
runGeo2rdr(burstTop, rdict, misreg_az=misreg_az, misreg_rg=misreg_rg)
if __name__ == '__main__':
'''
Generate burst-by-burst reverse geometry mapping for resampling.
'''
# Main Driver
main()