Meeting Agenda
1. Call to Order
2. Approval of Agenda
3. Approval of Minutes of previous mtg
4. IEEE Patent Policy
5. Discussion of Draft Standard
6. Other Business
7. Future Meetings
8. Adjourn
Minutes of SAR Metadata Std Working Group Meeting
May 20, 2020
1. Call to order
attendees:
Leland Pierce
Wade Schwartzkopf
Siri Jodha Khalsa
we have a quorum
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2. Approval of agenda
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SJ moved, Wade seconded, no discussion, no opposition
approved.
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3. Approval of minutes of previous meetings
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approve minutes for these mtgs:
march, april, june, july, 2019
april, may 7, 2020
Wade moved, SJ seconded, no discussion, no opposition
approved.
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4. IEEE Patent Policy
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1. slides 1-4 were shown and discussed by the chair
2. Chair provided an opportunity for participants to identify patent
claim(s)/patent application claim(s) and/or the holder of patent
claim(s)/patent application claim(s) of which the participant is
personally aware and that may be essential for the use of that
standard.
3. responses:
none
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5. Discussion of current draft standard
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===============================================================
went over the glossary of terms to decide what to do with each:
For completeness, here’s what we did last time:
===============================================================
across-track: keep, modify as per comments
AMI: delete (sensor-specific)
Active Remote Sensing System: delete (too generic)
ASAR: delete (sensor-specific)
along-track: keep, modify as per comments
alternating polarization: delete (sensor-specific)
amplitude: delete, make new term: “complex amplitude” and make sure to
define “magnitude” (later) as
magnitude = sqrt( re*re + im*im)
where “complex-amplitude” = re + j*im
where j= sqrt(-1)
antenna: delete, too generic, see next item
antenna array: keep, rewrite to make it an electronically-steered
array, as opposed to the current defn that seems to be
a static array
attenuation: delete, not used
azimuth ambiguity: delete, no used
azimuth bandpass filtering: delete, not used
azimuth beam inversion: keep, revise to make it clear its related to
stripmap only,
use “also known as”: slow-time beam compensation
azimuth compression: keep, remove ref. to Hamming
azimuth descalloping: remove, Wade: add new term: “image domain beam compensation”
azimuth time: remove,
Wade: add new term: “zero doppler time” or “center of aperture time”
Wade: add new term: “slow time since collection start”
backscatter: keep, Wade: add “also-known-as”: return, echo
band: remove, too generic
bandwidth: keep, Marc will write better defn
beam: keep, use Wade’s defn
beam mode: remove, but include in the spec. for “mode ID”
beam position: remove, not used
beta-0: keep
Leland: add defns for sigma-0 and gamma-0
bragg scattering: remove, not used
brightness: remove, no used
cardinal effect: remove, no used
c-band: remove, no used
chirp compression: remove, no used
circular polarization: keep, need to add to document
(see tables in SICD doc)
circularly polarized antenna: remove, too specific
clutter: rename to “distributed returns” and make sure it is used in
the part of document referring to radiometric calibration.
and make sure define and use “point returns” in the same
part of the document.
coherence: remove, not used
interferometric sar: remove, not used
conservation of confusion: remove, not used
conservation of coordinates: remove, not used
conservation of energy: remove, not used
co-polarization maxima: remove, not used
co-polarization nulls: remove, not used
co-polarization signature: remove, not used
corner reflector: remove, not used
cross-polarization maxima: remove, not used
cross-polarization nulls: remove, not used
cross-polarization signature: remove, not used
cross-polarized waves: remove, not used
degree of polarization: remove, not used
depolarization: remove, not used
detection: remove, not used
dipole sheet transform: remove, not used
doppler freq: keep, use “slow time” not “az time” in defn
dump last sentence. include equation(s)
doppler radar: remove, not used
dynamic range: keep
electromagnetic displacement: remove, not used
electromagnetic spectrum: keep
elliptical polarization: keep
elliptically polarized antenna: remove, too specific
ERS: remove, sensor-specific
frequency: keep
frequency assignment: remove, not used
frequency modulation: remove, not used
frequency rate: keep
horizontal polarization: keep, but modify so it is clear what
horizontal and vertical are referenced to: a ground plane, local
satellite level, or something else….
HH: remove, too specific, define when used in the document
HV: remove, too specific, define when used in the document
=======================================================================
these are what we went over this time:
=========================================================================
Imaging Radar: keep, make better, use a subset of the current defn
Impulse Response: keep, ask Marc/Wade to tweak
Incoherent: remove
In-Phase (I): remove
Integrated Side Lobe Ratio (ISLR): remove
Interferometer: remove
Interferometric Synthetic Aperture Radar (InSAR): remove
Interferometry: remove
Inverse Synthetic Aperture Radar (ISAR): remove
Linear Frequency Modulation (FM): keep, use LFM as acronym
Linear Polarization: keep
Linear Range Cell Migration Correction (RCMC): remove
Linearity: remove
Look Direction: needs further consideration as compared with
“side-of-track” vs. “az-angle”
Looks: remove
Matched Filtering: remove
Microwave: remove
Motion Compensation: keep, marc/wade re-do
Multi frequency Radar: remove
Multi polarization Radar: keep
Night Sensing: remove
Noise Equivalent Sigma Naught: keep, need to add to document somewhere.
Noise Figure: remove
Optical Correlator: remove
Passive System: remove
P-Band: remove
Phase Preserving: remove
Phase Unwrap: remove
Polarimetric Active Radar Calibrator (PARC): remove
Polarimetric Radar: keep, but Leland: reconsider vs. multi-polarization-radar,
full-pol vs. dual-pol, etc….
Polarization: keep, Marc fix
Polarization Beamwidth: remove
Polarization Efficiency: remove
Polarization Ellipse: remove
Polarization Loss: remove
Pulse: keep, Wade to refine
Pulse Compression: keep: Wade to reconsider
Pulse Repetition Frequency (PRF): keep
Quadrature (Q) Channel: remove
Quadrature Polarization Radar (Quad Pol Radar): remove
Radar Angles: remove
Radar Antenna: use either “antenna” or “radar antenna”, not both
Radar Beam: use either “beam” or “radar beam”, not both
Radar Cross Section (RCS): keep
Radar Parallax: remove
Radar Phase: keep, but change term to just “Phase”
Radar Transmission: Leland: look into combining with transmit, etc,
without the word “radar”
Radar Wave Energy: remove
RADARSAT-1: remove
Radio Altimetry: remove
Radio Band: need only one of: band/radar band/radio band
Radio Detection And Ranging (RADAR): keep
Radio Echo: kepp, change to “echo”, Marc/Wade modify definition
Radio Frequency (RF): keep, ask Marc to modify
Radiometer: remove
Radiometric Compensation: keep, Wade refine defn.
Range Time: keep so people can translate betw. difft terms for same idea.
Real Aperture Radar (RAR): remove
Remote Sensing: remove
Repeat Pass Interferometry: remove
Rotor-SAR (ROSAR): remove
SAR Focusing: keep so people can translate betw. difft terms for same
idea. need to disambiguate with “autofocus”
S-Band: remove
Scanning Synthetic Aperture Radar (ScanSAR): remove
Sea Satellite (SEASAT): remove
Sensitivity Time Control (STC): remove
Short Pulse Radar: remove
Sidelobes: keep, wade/marc modify defn
Side-Looking Aperture Radar (SLAR): remove
Signal Noise: keep, remove last sentence, modify document to refer to
this term when it speaks of “noise”.
Spectral Window: remove
Wade: add: “aperture weighting window” or something similar
Stereo Sensing: remove
Synthetic Aperture: keep one of this and the next one
Synthetic Aperture Radar (SAR): keep one of this and the previous one.
Synthetic Aperture Time: a stripmap defn, needs further investigation
Unpolarized Wave: remove
Vertical Polarization: keep and define what vertical means
Vertical Transmit-Horizontal Receive Polarization (VH): remove
Vertical Transmit-Vertical Receive Polarization (VV): remove
Wavelength: keep, add defn to document where we first define freq.
Wavelet: remove
X-Band: remove
Foreshortening: remove
Layover: remove, and make part of a new defn: “Layover Direction”
Shadowing effect: remove
DEM/DTM: remove
Interferometry: remove
Inverse SAR: remove
Spatial Descrimination: remove
Chirp radar: remove
Backscatter: remove
Beam: remove
Beam Mode: remove
Beam Position: remove
Calibration: keep: include radiometric and polarimetric as used in document.
Coherence: remove
Complex Number: keep
Data-take: remove
Detection (Radar): remove
Doppler Frequency: remove
Imaging Radar: remove
Level-0: remove
Level-1: remove
Level-2: remove
Look Direction
Looks: remove
Noise Equivalent Sigma Nought: remove
Pulse Repetition Frequency (PRF): remove
SAR Focusing: remove
Synthetic Aperture Radar (SAR): remove
Vertical Polarization: remove
Zero Doppler Time: keep, map to SICD “time of closest approach”
THe rest are SICD varaiable names, so don’t really belong in a
glossary
———————-
CollectorName
IlluminatorName
CollectType
ModeType
PixelType
NumRows
NumCols
First Row/column
Numrow/NumCol
SCPPixel
ValidData
Vertex
EarthModel
SCP
ECF
LLH
ICP
Vertex
GeoInfo
Grid
Image Plane
Type
RGAZIM
RGZERO
XRGYCR \& XCTYAT
PLANE
TimeCOAPoly
UVectECF
SS
ImpRespWid
Sgn
ImpRespBW
KCtr
DeltaK1
DeltaK2
DeltaKCOAPoly
WgtType
WindowName
WgtFunct
Wgt
CollectStart
CollectDuration
IPP
SET
TStart
Tend
ARPPoly
GRPPoly
TxAPCPoly
RcvAPC
RcvAPCPoly
TxFrequency
RefFreqIndex
Waveform
WFParameters
TxPulseLength
TxRFBandwidth
TxFMRate
RcvDemodType
RcvWindowLength
ADCSampleRate
RcvIFBandwidth
RcvFreqStart
RcvFMRate
TxSequence
TxStep
WFIndex
TxPolarization
RcvChannels
TxRcvPolarization
TxRcvPolarization
RcvAPCIndex
———————————-
new:
Phase History Data: Wade will add.
process:
========
Use the google file to make these changes:
1. for deletion, just delete (Leland will do all of these)
2. for modifying, directly modify the entry, and put “DONE-yourname” at
the end of the definition so everyone else knows it’s finished.
3. for adding new, put at the end, and put “DONE-yourname” at
the end of the definition so everyone else knows it’s finished.
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6. Other business?
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Copyright:
Concerning the copyright issues of the SICD standard, since much of this current standard is re-using much of the text, figures, and tables from SICD.
Leland sent an official request to Wade.
Wade gave the request to NGA lawyers, who have already approved it.
They are preparing an official response to send to IEEE soon.
Chuck Heazle:
He works for NGA and has done a preliminary analysis of modifying SICD to be compatible with ISO TC211 metadata standards. We plan to follow his advice to do the conversion for each item from SICD that we are including in this IEEE standard.
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7. Next meeting
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Our next meeting will be on :
Thursday, June 4, 10AM Eastern time
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8. Adjourn
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Wade motioned, Leland seconded. no opposition. passed