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
June 4, 2020
1. Call to order
attendees:
Leland Pierce
Wade Schwartzkopf
Marc Trachy
Craig Stringham
Gordon Farquharson
we have a quorum
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2. Approval of agenda
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Wade moved, Marc seconded, no discussion, no opposition
approved.
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3. Approval of minutes of previous meeting
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Marc moved, Wade 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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Wade said he would talk with Stephanie White at Maxar to determine
what changes they hace made to SICD, or want to make, so that we can
try to be consistent with their best practices.
We then discussed possible encoding strategies:
XML: most felt it was too old and cumbersome
JSON: nice, coupled with an external file for the image data
HDF5: nice, with attributes for the metadata, and datasets for the
image data
NITF: too old and cumbersome
I think there was agreement that JSON and HDF5 were the top
contenders.
Need to better understand what an iso19123 coverage is and how/if we
want to be compatible with it
Grid vs. Polynomial:
Marc preferes grids
Wade prefers polynomials
Both prefer one or the other, not a choice by the provider.
Marc:
there are many cases where polynomials are not accurate enough:
antenna pattern sidelobes, for example
high-order polynomials have problems that make them not desirable
Wade:
prefer polynomials since they are defined everywhere, no need to
interpolate
also provides an obvious way to get derivatives
Marc:
the metadata should provide guidance on how to use the grid
points along with an interpolation equation/strategy.
This provides a way to have it defined everywhere, with
derivatives.
Would need to have some kind of error measure(s) associated with
each of these, polynmonal or grid. including the derivatives
Leland:
needs to come up with a list of paramaters in the current SICD
std that may be affected by this
what about the need for multi-burst, multi-polarization, multi-band
datasets?
right now sicd deals with just 1 collect.
Is it possible to generalize and come up with a std that includes all
of these?
Simply just duplicate the metadata for each of the separate image-data
datasets?
perhaps have a hierarchy, “top” gives data related to the ensemble,
separate parts provide metadata that is different than that given in
the “top”.
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6. Other business?
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Wade also mentioned that the NGA lawyers are nearly ready to send back
the copyright form-letter to ieee.
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7. Next meeting
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the group wanted to have the next meeting in 2 weeks, at 11am.
Our next meeting will be on :
Thursday, June 18, 11AM Eastern time
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8. Adjourn
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Marc motioned, Wade seconded. no opposition. passed