#!/usr/bin/env python3 #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # Copyright 2010 California Institute of Technology. ALL RIGHTS RESERVED. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # # United States Government Sponsorship acknowledged. This software is subject to # U.S. export control laws and regulations and has been classified as 'EAR99 NLR' # (No [Export] License Required except when exporting to an embargoed country, # end user, or in support of a prohibited end use). By downloading this software, # the user agrees to comply with all applicable U.S. export laws and regulations. # The user has the responsibility to obtain export licenses, or other export # authority as may be required before exporting this software to any 'EAR99' # embargoed foreign country or citizen of those countries. # # Author: Walter Szeliga #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ import math from isce import logging from iscesys.Compatibility import Compatibility Compatibility.checkPythonVersion() from isceobj.Location.Peg import Peg from iscesys.Component.FactoryInit import FactoryInit class CalculatePegPoint(FactoryInit): def calculatePegPoint(self): self.logger.info("Parsing Raw Data") self.sensorObj.parse() frame = self.sensorObj.getFrame() # First, get the orbit nadir location at mid-swath and the end of the scene orbit = self.sensorObj.getFrame().getOrbit() midxyz = orbit.interpolateOrbit(frame.getSensingMid()) endxyz = orbit.interpolateOrbit(frame.getSensingStop()) # Next, calculate the satellite heading from the mid-point to the end of the scene ellipsoid = frame.getInstrument().getPlatform().getPlanet().get_elp() midllh = ellipsoid.xyz_to_llh(midxyz.getPosition()) endllh = ellipsoid.xyz_to_llh(endxyz.getPosition()) heading = ellipsoid.geo_hdg(midllh,endllh) # Then create a peg point from this data peg = Peg(latitude=midllh[0],longitude=midllh[1],heading=heading,ellipsoid=ellipsoid) self.logger.info("Peg Point:\n%s" % peg) def __init__(self,arglist): FactoryInit.__init__(self) self.initFactory(arglist) self.sensorObj = self.getComponent('Sensor') self.logger = logging.getLogger('isce.calculatePegPoint') if __name__ == "__main__": import sys if (len(sys.argv) < 2): print("Usage:%s " % sys.argv[0]) sys.exit(1) runObj = CalculatePegPoint(sys.argv[1:]) runObj.calculatePegPoint()