93 lines
3.2 KiB
Python
93 lines
3.2 KiB
Python
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#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# Copyright 2013 California Institute of Technology. ALL RIGHTS RESERVED.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# United States Government Sponsorship acknowledged. This software is subject to
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# U.S. export control laws and regulations and has been classified as 'EAR99 NLR'
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# (No [Export] License Required except when exporting to an embargoed country,
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# end user, or in support of a prohibited end use). By downloading this software,
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# the user agrees to comply with all applicable U.S. export laws and regulations.
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# The user has the responsibility to obtain export licenses, or other export
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# authority as may be required before exporting this software to any 'EAR99'
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# embargoed foreign country or citizen of those countries.
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#
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# Authors: Kosal Khun, Marco Lavalle
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#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# Comment: Adapted from InsarProc/runPrepareResamps.py
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import math
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import logging
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from isceobj.Constants import SPEED_OF_LIGHT
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logger = logging.getLogger('isce.isceProc.runPrepareResamps')
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def runPrepareResamps(self, rgLooks=None, azLooks=None):
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refScene = self._isce.refScene
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refPol = self._isce.refPol
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orbit = self._isce.orbits[refScene][refPol]
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frame = self._isce.frames[refScene][refPol]
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peg = self._isce.peg
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slcImage = self._isce.slcImages[refScene][refPol]
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time, schPosition, schVelocity, offset = orbit._unpackOrbit()
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s2 = schPosition[0][0]
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s2_2 = schPosition[1][0]
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lines = self._isce.numberPatches * self._isce.numberValidPulses
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self._isce.numberResampLines = lines
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fs = frame.getInstrument().getRangeSamplingRate()
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dr = (SPEED_OF_LIGHT / (2 * fs))
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self._isce.slantRangePixelSpacing = dr
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widthSlc = slcImage.getWidth()
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radarWavelength = frame.getInstrument().getRadarWavelength()
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rc = peg.getRadiusOfCurvature()
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ht = self._isce.averageHeight
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r0 = frame.getStartingRange()
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range = r0 + (widthSlc / 2 * dr)
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costheta = (2*rc*ht+ht*ht-range*range)/-2/rc/range
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sininc = math.sqrt(1 - (costheta * costheta))
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posting = self.posting
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grndpixel = dr / sininc
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if rgLooks:
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looksrange = rgLooks
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else:
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looksrange = int(posting/grndpixel+0.5)
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if azLooks:
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looksaz = azLooks
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else:
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looksaz = int(round(posting/(s2_2 - s2)))
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if (looksrange < 1):
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logger.warning("Number range looks less than zero, setting to 1")
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looksrange = 1
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if (looksaz < 1):
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logger.warning("Number azimuth looks less than zero, setting to 1")
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looksaz = 1
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self._isce.numberAzimuthLooks = looksaz
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self._isce.numberRangeLooks = looksrange
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