def extract_tops_metadata(xml_file):
"""Read metadata from xml file for Sentinel-1/TOPS
Parameters: xml_file : str, path of the .xml file, i.e. master/IW1.xml
Returns: meta : dict, metadata
"""
import isce
from isceobj.Planet.Planet import Planet
obj = load_product(xml_file)
burst = obj.bursts[0]
burstEnd = obj.bursts[-1]
metadata = {}
metadata['prf'] = burst.prf
metadata['startUTC'] = burst.burstStartUTC
metadata['stopUTC'] = burstEnd.burstStopUTC
metadata['radarWavelength'] = burst.radarWavelength
metadata['rangePixelSize'] = burst.rangePixelSize
metadata['startingRange'] = burst.startingRange
metadata['passDirection'] = burst.passDirection
metadata['polarization'] = burst.polarization
metadata['trackNumber'] = burst.trackNumber
metadata['orbitNumber'] = burst.orbitNumber
time_seconds = (burst.burstStartUTC.hour * 3600.0 +
burst.burstStartUTC.minute * 60.0 +
burst.burstStartUTC.second)
metadata['CENTER_LINE_UTC'] = time_seconds
orbit = burst.orbit
peg = orbit.interpolateOrbit(burst.sensingMid, method='hermite')
Vs = np.linalg.norm(peg.getVelocity())
metadata['satelliteSpeed'] = Vs
metadata['azimuthPixelSize'] = Vs*burst.azimuthTimeInterval
refElp = Planet(pname='Earth').ellipsoid
llh = refElp.xyz_to_llh(peg.getPosition())
refElp.setSCH(llh[0], llh[1], orbit.getENUHeading(burst.sensingMid))
metadata['earthRadius'] = refElp.pegRadCur
metadata['altitude'] = llh[2]
# for Sentinel-1
metadata['beam_mode'] = 'IW'
metadata['swathNumber'] = burst.swathNumber
# 1. multipel subswaths
xml_files = glob.glob(os.path.join(os.path.dirname(xml_file), 'IW*.xml'))
if len(xml_files) > 1:
swath_num = [load_product(fname).bursts[0].swathNumber for fname in xml_files]
metadata['swathNumber'] = ''.join(str(i) for i in sorted(swath_num))
# 2. calculate ASF frame number for Sentinel-1
metadata['firstFrameNumber'] = int(0.2 * (burst.burstStartUTC - obj.ascendingNodeTime).total_seconds())
metadata['lastFrameNumber'] = int(0.2 * (burstEnd.burstStopUTC - obj.ascendingNodeTime).total_seconds())
return metadata
def extract_stripmap_metadata(meta_file):
"""Read metadata from shelve file for StripMap stack from ISCE
Parameters: meta_file : str, path of the shelve file, i.e. masterShelve/data.dat
Returns: meta : dict, metadata
"""
import isce
import isceobj
import isceobj.StripmapProc.StripmapProc as St
from isceobj.Planet.Planet import Planet
if os.path.basename(meta_file) == "data.dat": #shelve file from stripmapStack
fbase = os.path.splitext(meta_file)[0]
with shelve.open(fbase, flag='r') as mdb:
frame = mdb['frame']
elif meta_file.endswith(".xml"): #XML file from stripmapApp
frame = load_product(meta_file)
metadata = {}
metadata['prf'] = frame.PRF
metadata['startUTC'] = frame.sensingStart
metadata['stopUTC'] = frame.sensingStop
metadata['radarWavelength'] = frame.radarWavelegth
metadata['rangePixelSize'] = frame.instrument.rangePixelSize
metadata['startingRange'] = frame.startingRange
metadata['polarization'] = frame.polarization.replace('/', '')
if metadata['polarization'].startswith("b'"):
metadata['polarization'] = metadata['polarization'][2:4]
metadata['trackNumber'] = frame.trackNumber
metadata['orbitNumber'] = frame.orbitNumber
time_seconds = (frame.sensingStart.hour*3600.0 +
frame.sensingStart.minute*60.0 +
frame.sensingStart.second)
metadata['CENTER_LINE_UTC'] = time_seconds
orbit = frame.orbit
peg = orbit.interpolateOrbit(frame.sensingMid, method='hermite')
Vs = np.linalg.norm(peg.getVelocity())
metadata['satelliteSpeed'] = Vs
metadata['azimuthPixelSize'] = Vs/frame.PRF
refElp = Planet(pname='Earth').ellipsoid
llh = refElp.xyz_to_llh(peg.getPosition())
refElp.setSCH(llh[0], llh[1], orbit.getENUHeading(frame.sensingMid))
metadata['earthRadius'] = refElp.pegRadCur
metadata['altitude'] = llh[2]
# for StripMap
metadata['beam_mode'] = 'SM'
return metadata
def extract_tops_metadata(xml_file):
"""Read metadata from xml file for Sentinel-1/TOPS
Parameters: xml_file : str, path of the .xml file, i.e. master/IW1.xml
Returns: meta : dict, metadata
"""
import isce
import isceobj
from isceobj.Planet.Planet import Planet
obj = load_product(xml_file)
burst = obj.bursts[0]
burstEnd = obj.bursts[-1]
metadata = {}
metadata['prf'] = burst.prf
metadata['startUTC'] = burst.burstStartUTC
metadata['stopUTC'] = burstEnd.burstStopUTC
metadata['radarWavelength'] = burst.radarWavelength
metadata['startingRange'] = burst.startingRange
metadata['passDirection'] = burst.passDirection
metadata['polarization'] = burst.polarization
metadata['trackNumber'] = burst.trackNumber
metadata['orbitNumber'] = burst.orbitNumber
time_seconds = (burst.burstStartUTC.hour * 3600.0 +
burst.burstStartUTC.minute * 60.0 +
burst.burstStartUTC.second)
metadata['CENTER_LINE_UTC'] = time_seconds
orbit = burst.orbit
peg = orbit.interpolateOrbit(burst.sensingMid, method='hermite')
# Sentinel-1 TOPS pixel spacing
Vs = np.linalg.norm(peg.getVelocity()) #satellite speed
metadata['azimuthPixelSize'] = Vs * burst.azimuthTimeInterval
metadata['rangePixelSize'] = burst.rangePixelSize
# Sentinel-1 TOPS spatial resolution
iw_str = 'IW2'
if os.path.basename(xml_file).startswith('IW'):
iw_str = os.path.splitext(os.path.basename(xml_file))[0]
metadata['azimuthResolution'] = S1_TOPS_RESOLUTION[iw_str][
'azimuthResolution']
metadata['rangeResolution'] = S1_TOPS_RESOLUTION[iw_str]['rangeResolution']
refElp = Planet(pname='Earth').ellipsoid
llh = refElp.xyz_to_llh(peg.getPosition())
refElp.setSCH(llh[0], llh[1], orbit.getENUHeading(burst.sensingMid))
metadata['earthRadius'] = refElp.pegRadCur
metadata['altitude'] = llh[2]
# for Sentinel-1
metadata['beam_mode'] = 'IW'
metadata['swathNumber'] = burst.swathNumber
# 1. multipel subswaths
xml_files = glob.glob(os.path.join(os.path.dirname(xml_file), 'IW*.xml'))
if len(xml_files) > 1:
swath_num = [
load_product(fname).bursts[0].swathNumber for fname in xml_files
]
metadata['swathNumber'] = ''.join(str(i) for i in sorted(swath_num))
# 2. calculate ASF frame number for Sentinel-1
metadata['firstFrameNumber'] = int(
0.2 * (burst.burstStartUTC - obj.ascendingNodeTime).total_seconds())
metadata['lastFrameNumber'] = int(
0.2 * (burstEnd.burstStopUTC - obj.ascendingNodeTime).total_seconds())
return metadata, burst
def rdr2geo(self, aztime, rng, height=0.,
doppler = None, wvl = None,
planet=None, side=-1):
'''
Returns point on ground at given height and doppler frequency.
Never to be used for heavy duty computing.
'''
from isceobj.Planet.Planet import Planet
####Setup doppler for the equations
dopfact = 0.0
hdg = self.getENUHeading(time=aztime)
sv = self.interpolateOrbit(aztime, method='hermite')
pos = sv.getPosition()
vel = sv.getVelocity()
vmag = np.linalg.norm(vel)
if doppler is not None:
dopfact = doppler(DTU.seconds_since_midnight(aztime), rng) * 0.5 * wvl * rng/vmag
if planet is None:
refElp = Planet(pname='Earth').ellipsoid
else:
refElp = planet.ellipsoid
###Convert position and velocity to local tangent plane
satLLH = refElp.xyz_to_llh(pos)
refElp.setSCH(satLLH[0], satLLH[1], hdg)
radius = refElp.pegRadCur
#####Setup ortho normal system right below satellite
satVec = np.array(pos)
velVec = np.array(vel)
###Setup TCN basis
clat = np.cos(np.radians(satLLH[0]))
slat = np.sin(np.radians(satLLH[0]))
clon = np.cos(np.radians(satLLH[1]))
slon = np.sin(np.radians(satLLH[1]))
nhat = np.array([-clat*clon, -clat*slon, -slat])
temp = np.cross(nhat, velVec)
chat = temp / np.linalg.norm(temp)
temp = np.cross(chat, nhat)
that = temp / np.linalg.norm(temp)
vhat = velVec / np.linalg.norm(velVec)
####Solve the range doppler eqns iteratively
####Initial guess
zsch = height
for ii in range(10):
###Near nadir tests
if (satLLH[2]-zsch) >= rng:
return None
a = (satLLH[2] + radius)
b = (radius + zsch)
costheta = 0.5*(a/rng + rng/a - (b/a)*(b/rng))
sintheta = np.sqrt(1-costheta*costheta)
gamma = rng*costheta
alpha = dopfact - gamma*np.dot(nhat,vhat)/np.dot(vhat,that)
beta = -side*np.sqrt(rng*rng*sintheta*sintheta - alpha*alpha)
delta = alpha * that + beta * chat + gamma * nhat
targVec = satVec + delta
targLLH = refElp.xyz_to_llh(list(targVec))
targXYZ = refElp.llh_to_xyz([targLLH[0], targLLH[1], height])
targSCH = refElp.xyz_to_sch(targXYZ)
zsch = targSCH[2]
rdiff = rng - np.linalg.norm(np.array(satVec) - np.array(targXYZ))
return targLLH
def runUnwrap(self,costMode = None,initMethod = None, defomax = None, initOnly = None):
if costMode is None:
costMode = 'DEFO'
if initMethod is None:
initMethod = 'MST'
if defomax is None:
defomax = 4.0
if initOnly is None:
initOnly = False
wrapName = os.path.join( self._insar.mergedDirname, self._insar.filtFilename)
unwrapName = os.path.join( self._insar.mergedDirname, self._insar.unwrappedIntFilename)
img = isceobj.createImage()
img.load(wrapName + '.xml')
swathList = self._insar.getValidSwathList(self.swaths)
for swath in swathList[0:1]:
ifg = self._insar.loadProduct( os.path.join(self._insar.fineIfgDirname, 'IW{0}.xml'.format(swath)))
wavelength = ifg.bursts[0].radarWavelength
width = img.getWidth()
####tmid
tstart = ifg.bursts[0].sensingStart
tend = ifg.bursts[-1].sensingStop
tmid = tstart + 0.5*(tend - tstart)
orbit = ifg.bursts[0].orbit
peg = orbit.interpolateOrbit(tmid, method='hermite')
refElp = Planet(pname='Earth').ellipsoid
llh = refElp.xyz_to_llh(peg.getPosition())
hdg = orbit.getENUHeading(tmid)
refElp.setSCH(llh[0], llh[1], hdg)
earthRadius = refElp.pegRadCur
altitude = llh[2]
corrfile = os.path.join(self._insar.mergedDirname, self._insar.coherenceFilename)
rangeLooks = self.numberRangeLooks
azimuthLooks = self.numberAzimuthLooks
azfact = 0.8
rngfact = 0.8
corrLooks = rangeLooks * azimuthLooks/(azfact*rngfact)
maxComponents = 20
snp = Snaphu()
snp.setInitOnly(initOnly)
snp.setInput(wrapName)
snp.setOutput(unwrapName)
snp.setWidth(width)
snp.setCostMode(costMode)
snp.setEarthRadius(earthRadius)
snp.setWavelength(wavelength)
snp.setAltitude(altitude)
snp.setCorrfile(corrfile)
snp.setInitMethod(initMethod)
snp.setCorrLooks(corrLooks)
snp.setMaxComponents(maxComponents)
snp.setDefoMaxCycles(defomax)
snp.setRangeLooks(rangeLooks)
snp.setAzimuthLooks(azimuthLooks)
snp.setCorFileFormat('FLOAT_DATA')
snp.prepare()
snp.unwrap()
######Render XML
outImage = isceobj.Image.createUnwImage()
outImage.setFilename(unwrapName)
outImage.setWidth(width)
outImage.setAccessMode('read')
outImage.renderVRT()
outImage.createImage()
outImage.finalizeImage()
outImage.renderHdr()
#####Check if connected components was created
if snp.dumpConnectedComponents:
connImage = isceobj.Image.createImage()
connImage.setFilename(unwrapName+'.conncomp')
#At least one can query for the name used
self._insar.connectedComponentsFilename = unwrapName+'.conncomp'
connImage.setWidth(width)
connImage.setAccessMode('read')
connImage.setDataType('BYTE')
connImage.renderVRT()
connImage.createImage()
connImage.finalizeImage()
connImage.renderHdr()
return
def extract_stripmap_metadata(meta_file):
"""Read metadata from shelve file for StripMap stack from ISCE
Parameters: meta_file : str, path of the shelve file, i.e. masterShelve/data.dat
Returns: meta : dict, metadata
"""
SPEED_OF_LIGHT = 299792458 #m/s
import isce
import isceobj
from isceobj.Planet.Planet import Planet
if os.path.basename(
meta_file) == "data.dat": #shelve file from stripmapStack
fbase = os.path.splitext(meta_file)[0]
with shelve.open(fbase, flag='r') as mdb:
frame = mdb['frame']
elif meta_file.endswith(".xml"): #XML file from stripmapApp
frame = load_product(meta_file)
else:
raise ValueError(
'un-recognized isce/stripmap metadata file: {}'.format(meta_file))
metadata = {}
metadata['prf'] = frame.PRF
metadata['startUTC'] = frame.sensingStart
metadata['stopUTC'] = frame.sensingStop
metadata['radarWavelength'] = frame.radarWavelegth
metadata['startingRange'] = frame.startingRange
metadata['polarization'] = str(frame.polarization).replace('/', '')
if metadata['polarization'].startswith("b'"):
metadata['polarization'] = metadata['polarization'][2:4]
metadata['trackNumber'] = frame.trackNumber
metadata['orbitNumber'] = frame.orbitNumber
time_seconds = (frame.sensingStart.hour * 3600.0 +
frame.sensingStart.minute * 60.0 +
frame.sensingStart.second)
metadata['CENTER_LINE_UTC'] = time_seconds
orbit = frame.orbit
peg = orbit.interpolateOrbit(frame.sensingMid, method='hermite')
Vs = np.linalg.norm(peg.getVelocity()) #satellite speed
metadata['azimuthResolution'] = frame.platform.antennaLength / 2.0
metadata['azimuthPixelSize'] = Vs / frame.PRF
frame.getInstrument()
rgBandwidth = frame.instrument.pulseLength * frame.instrument.chirpSlope
metadata['rangeResolution'] = abs(SPEED_OF_LIGHT / (2.0 * rgBandwidth))
metadata['rangePixelSize'] = frame.instrument.rangePixelSize
refElp = Planet(pname='Earth').ellipsoid
llh = refElp.xyz_to_llh(peg.getPosition())
refElp.setSCH(llh[0], llh[1], orbit.getENUHeading(frame.sensingMid))
metadata['earthRadius'] = refElp.pegRadCur
metadata['altitude'] = llh[2]
# for StripMap
metadata['beam_mode'] = 'SM'
return metadata, frame
def extractInfo(xmlName, inps):
'''
Extract required information from pickle file.
'''
from isceobj.Planet.Planet import Planet
from isceobj.Util.geo.ellipsoid import Ellipsoid
# with open(pckfile, 'rb') as f:
# frame = pickle.load(f)
#with shelve.open(pckfile,flag='r') as db:
# frame = db['swath']
frame = ut.loadProduct(xmlName)
burst = frame.bursts[0]
planet = Planet(pname='Earth')
elp = Ellipsoid(planet.ellipsoid.a, planet.ellipsoid.e2, 'WGS84')
data = {}
data['wavelength'] = burst.radarWavelength
tstart = frame.bursts[0].sensingStart
tend = frame.bursts[-1].sensingStop
#tmid = tstart + 0.5*(tend - tstart)
tmid = tstart
orbit = burst.orbit
peg = orbit.interpolateOrbit(tmid, method='hermite')
refElp = Planet(pname='Earth').ellipsoid
llh = refElp.xyz_to_llh(peg.getPosition())
hdg = orbit.getENUHeading(tmid)
refElp.setSCH(llh[0], llh[1], hdg)
earthRadius = refElp.pegRadCur
altitude = llh[2]
#sv = burst.orbit.interpolateOrbit(tmid, method='hermite')
#pos = sv.getPosition()
#llh = elp.ECEF(pos[0], pos[1], pos[2]).llh()
data['altitude'] = altitude #llh.hgt
#hdg = burst.orbit.getHeading()
data[
'earthRadius'] = earthRadius #elp.local_radius_of_curvature(llh.lat, hdg)
#azspacing = burst.azimuthTimeInterval * sv.getScalarVelocity()
#azres = 20.0
#corrfile = os.path.join(self._insar.mergedDirname, self._insar.coherenceFilename)
rangeLooks = inps.rglooks
azimuthLooks = inps.azlooks
azfact = 0.8
rngfact = 0.8
corrLooks = rangeLooks * azimuthLooks / (azfact * rngfact)
data[
'corrlooks'] = corrLooks #inps.rglooks * inps.azlooks * azspacing / azres
data['rglooks'] = inps.rglooks
data['azlooks'] = inps.azlooks
return data
def extract_isce_metadata(xmlFile, rscFile=None):
import isce
from isceobj.Planet.Planet import Planet
print('extract metadata from xml file:', xmlFile)
metadata = {}
master = load_product(xmlFile)
metadata['spacecraftName'] = master.spacecraftName
burst = master.bursts[0]
burstEnd = master.bursts[-1]
metadata['radarWavelength'] = burst.radarWavelength
metadata['rangePixelSize'] = burst.rangePixelSize
metadata['prf'] = burst.prf
metadata['startUTC'] = burst.burstStartUTC
metadata['stopUTC'] = burstEnd.burstStopUTC
metadata['startingRange'] = burst.startingRange
metadata['passDirection'] = burst.passDirection
metadata['polarization'] = burst.polarization
metadata['trackNumber'] = burst.trackNumber
metadata['orbitNumber'] = burst.orbitNumber
metadata['swathNumber'] = burst.swathNumber
# swathNumber for multipel subswaths
xml_files = glob.glob(os.path.join(os.path.dirname(xmlFile), 'IW*.xml'))
if len(xml_files) > 1:
swath_num = []
for xml_file in xml_files:
swath_num.append(load_product(xml_file).bursts[0].swathNumber)
metadata['swathNumber'] = ''.join(str(i) for i in sorted(swath_num))
# calculate ASF frame number for Sentinel-1
metadata['firstFrameNumber'] = int(
np.floor(
0.2 *
(burst.burstStartUTC - master.ascendingNodeTime).total_seconds()))
metadata['lastFrameNumber'] = int(
np.floor(0.2 * (burstEnd.burstStopUTC -
master.ascendingNodeTime).total_seconds()))
time_seconds = (burst.burstStartUTC.hour * 3600.0 +
burst.burstStartUTC.minute * 60.0 +
burst.burstStartUTC.second)
metadata['CENTER_LINE_UTC'] = time_seconds
Vs = np.linalg.norm(
burst.orbit.interpolateOrbit(burst.sensingMid,
method='hermite').getVelocity())
metadata['satelliteSpeed'] = Vs
metadata['azimuthTimeInterval'] = burst.azimuthTimeInterval
metadata['azimuthPixelSize'] = Vs * burst.azimuthTimeInterval
tstart = burst.sensingStart
tend = burstEnd.sensingStop
tmid = tstart + 0.5 * (tend - tstart)
orbit = burst.orbit
peg = orbit.interpolateOrbit(tmid, method='hermite')
refElp = Planet(pname='Earth').ellipsoid
llh = refElp.xyz_to_llh(peg.getPosition())
hdg = orbit.getENUHeading(tmid)
refElp.setSCH(llh[0], llh[1], hdg)
metadata['earthRadius'] = refElp.pegRadCur
metadata['altitude'] = llh[2]
# make all value in string format
for key, value in metadata.items():
metadata[key] = str(value)
metadata = readfile.standardize_metadata_isce(metadata)
if rscFile:
print('writing ', rscFile)
writefile.write_roipac_rsc(metadata, rscFile)
return metadata
def rdr2geoNew(self,
aztime,
rng,
height=0.,
doppler=None,
wvl=None,
planet=None,
side=-1):
'''
Returns point on ground at given height and doppler frequency.
Never to be used for heavy duty computing.
'''
from isceobj.Planet.Planet import Planet
####Setup doppler for the equations
dopfact = 0.
sv = self.interpolateOrbit(aztime, method='hermite')
pos = np.array(sv.getPosition())
vel = np.array(sv.getVelocity())
vmag = np.linalg.norm(vel)
if doppler is not None:
dopfact = doppler(DTU.seconds_since_midnight(aztime),
rng) * 0.5 * wvl * rng / vmag
if planet is None:
refElp = Planet(pname='Earth').ellipsoid
else:
refElp = planet.ellipsoid
###Convert position and velocity to local tangent plane
major = refElp.a
minor = major * np.sqrt(1 - refElp.e2)
#####Setup ortho normal system right below satellite
satDist = np.linalg.norm(pos)
alpha = 1 / np.linalg.norm(pos / np.array([major, major, minor]))
radius = alpha * satDist
hgt = (1.0 - alpha) * satDist
###Setup TCN basis - Geocentric
nhat = -pos / satDist
temp = np.cross(nhat, vel)
chat = temp / np.linalg.norm(temp)
temp = np.cross(chat, nhat)
that = temp / np.linalg.norm(temp)
vhat = vel / vmag
####Solve the range doppler eqns iteratively
####Initial guess
zsch = height
for ii in range(10):
###Near nadir tests
if (hgt - zsch) >= rng:
return None
a = satDist
b = (radius + zsch)
costheta = 0.5 * (a / rng + rng / a - (b / a) * (b / rng))
sintheta = np.sqrt(1 - costheta * costheta)
gamma = rng * costheta
alpha = dopfact - gamma * np.dot(nhat, vhat) / np.dot(vhat, that)
beta = -side * np.sqrt(rng * rng * sintheta * sintheta -
alpha * alpha)
delta = alpha * that + beta * chat + gamma * nhat
targVec = pos + delta
targLLH = refElp.xyz_to_llh(list(targVec))
targXYZ = np.array(
refElp.llh_to_xyz([targLLH[0], targLLH[1], height]))
zsch = np.linalg.norm(targXYZ) - radius
rdiff = rng - np.linalg.norm(pos - targXYZ)
return targLLH
def runUnwrap(inps,
costMode=None,
initMethod=None,
defomax=None,
initOnly=None):
if costMode is None:
costMode = 'DEFO'
if initMethod is None:
initMethod = 'MST'
if defomax is None:
defomax = 4.0
if initOnly is None:
initOnly = False
#get earth radius and altitude using master's orbit
with open(inps.mframe, 'rb') as f:
mframe = pickle.load(f)
azti = 1.0 / mframe.PRF
tmid = mframe.getSensingStart() + datetime.timedelta(
seconds=azti * (mframe.getNumberOfLines() / 2.0))
orbit = mframe.getOrbit()
peg = orbit.interpolateOrbit(tmid, method='hermite')
refElp = Planet(pname='Earth').ellipsoid
llh = refElp.xyz_to_llh(peg.getPosition())
hdg = orbit.getHeading(tmid)
#change to the following after updated to the newest version of isce
#hdg = orbit.getENUHeading(tmid)
refElp.setSCH(llh[0], llh[1], hdg)
earthRadius = refElp.pegRadCur
altitude = llh[2]
wrapName = inps.inf
unwrapName = inps.unw
corrfile = inps.cor
width = getWidth(wrapName + '.xml')
wavelength = mframe.getInstrument().getRadarWavelength()
rangeLooks = inps.rlks
azimuthLooks = inps.alks
#calculate azimuth resolution and pixel size
azres = mframe.platform.antennaLength / 2.0
vel = np.sqrt(peg.velocity[0] * peg.velocity[0] +
peg.velocity[1] * peg.velocity[1] +
peg.velocity[2] * peg.velocity[2])
hgt = np.sqrt(peg.position[0] * peg.position[0] +
peg.position[1] * peg.position[1] +
peg.position[2] * peg.position[2])
azimuthPixelSpacing = earthRadius / hgt * vel * azti
azfact = azres / azimuthPixelSpacing
#calculate range resolution and pixel size
rBW = mframe.instrument.pulseLength * mframe.instrument.chirpSlope
rgres = abs(SPEED_OF_LIGHT / (2.0 * rBW))
slantRangePixelSpacing = 0.5 * SPEED_OF_LIGHT / mframe.rangeSamplingRate
rngfact = rgres / slantRangePixelSpacing
print('azfact: {}, rngfact: {}'.format(azfact, rngfact))
corrLooks = azimuthLooks * rangeLooks / (azfact * rngfact)
maxComponents = 20
snp = Snaphu()
snp.setInitOnly(initOnly) # follow
snp.setInput(wrapName)
snp.setOutput(unwrapName)
snp.setWidth(width)
snp.setCostMode(costMode) # follow
snp.setEarthRadius(earthRadius)
snp.setWavelength(wavelength)
snp.setAltitude(altitude)
snp.setCorrfile(corrfile)
snp.setInitMethod(initMethod) # follow
snp.setCorrLooks(corrLooks)
snp.setMaxComponents(maxComponents)
snp.setDefoMaxCycles(defomax) # follow
snp.setRangeLooks(rangeLooks)
snp.setAzimuthLooks(azimuthLooks)
#snp.setCorFileFormat('FLOAT_DATA')
snp.prepare()
snp.unwrap()
######Render XML
outImage = isceobj.Image.createUnwImage()
outImage.setFilename(unwrapName)
outImage.setWidth(width)
outImage.setAccessMode('read')
outImage.renderVRT()
outImage.createImage()
outImage.finalizeImage()
outImage.renderHdr()
#####Check if connected components was created
if snp.dumpConnectedComponents:
connImage = isceobj.Image.createImage()
connImage.setFilename(unwrapName + '.conncomp')
#At least one can query for the name used
#self._insar.connectedComponentsFilename = unwrapName+'.conncomp'
connImage.setWidth(width)
connImage.setAccessMode('read')
connImage.setDataType('BYTE')
connImage.renderVRT()
connImage.createImage()
connImage.finalizeImage()
connImage.renderHdr()
return
def numberOfLooks(self, frame, posting, azlooks, rglooks):
'''
Compute relevant number of looks.
'''
from isceobj.Planet.Planet import Planet
from isceobj.Constants import SPEED_OF_LIGHT
import numpy as np
azFinal = None
rgFinal = None
if azlooks is not None:
azFinal = azlooks
if rglooks is not None:
rgFinal = rglooks
if (azFinal is not None) and (rgFinal is not None):
return (azFinal, rgFinal)
if posting is None:
raise Exception(
'Input posting is none. Either specify (azlooks, rglooks) or posting in input file'
)
elp = Planet(pname='Earth').ellipsoid
####First determine azimuth looks
tmid = frame.sensingMid
sv = frame.orbit.interpolateOrbit(tmid,
method='hermite') #.getPosition()
llh = elp.xyz_to_llh(sv.getPosition())
if azFinal is None:
hdg = frame.orbit.getENUHeading(tmid)
elp.setSCH(llh[0], llh[1], hdg)
sch, vsch = elp.xyzdot_to_schdot(sv.getPosition(),
sv.getVelocity())
azFinal = max(int(np.round(posting * frame.PRF / vsch[0])), 1)
if rgFinal is None:
pulseLength = frame.instrument.pulseLength
chirpSlope = frame.instrument.chirpSlope
#Range Bandwidth
rBW = np.abs(chirpSlope) * pulseLength
# Slant Range resolution
rgres = abs(SPEED_OF_LIGHT / (2.0 * rBW))
r0 = frame.startingRange
rmax = frame.getFarRange()
rng = (r0 + rmax) / 2
Re = elp.pegRadCur
H = sch[2]
cos_beta_e = (Re**2 + (Re + H)**2 - rng**2) / (2 * Re * (Re + H))
sin_bet_e = np.sqrt(1 - cos_beta_e**2)
sin_theta_i = sin_bet_e * (Re + H) / rng
print("incidence angle at the middle of the swath: ",
np.arcsin(sin_theta_i) * 180.0 / np.pi)
groundRangeRes = rgres / sin_theta_i
print("Ground range resolution at the middle of the swath: ",
groundRangeRes)
rgFinal = max(int(np.round(posting / groundRangeRes)), 1)
return azFinal, rgFinal