1. Call to Order
\n2. Approval of Agenda
\n3. Approval of Minutes of previous mtg
\n4. IEEE Patent Policy
\n5. Discussion of Draft Standard
\n6. Other Business
\n7. Future Meetings
\n8. Adjourn<\/p>\n
Minutes of SAR Metadata Std Working Group Meeting
\nJuly 30, 2020<\/p>\n
1. Call to order
\nattendees:
\nLeland Pierce
\nWade Schwartzkopf
\nMarc Trachy
\nChuck Heazel
\nMike Stewart
\nnathan Bombaci
\nVanessa Lalitte<\/p>\n
we have a quorum<\/p>\n
===================================
\n2. Approval of agenda
\n===================================
\nMarc moved, Wade seconded, no discussion, no opposition
\napproved.<\/p>\n
===================================
\n3. Approval of minutes of previous meeting
\n===================================
\nMarc moved, Mike seconded, no discussion, no opposition
\napproved.<\/p>\n
===================================
\n4. IEEE Patent and Copyright Policy
\n===================================
\n1. slides 1-4 were shown and discussed by the chair
\n2. Chair provided an opportunity for participants to identify patent
\nclaim(s)\/patent application claim(s) and\/or the holder of patent
\nclaim(s)\/patent application claim(s) of which the participant is
\npersonally aware and that may be essential for the use of that
\nstandard.<\/p>\n
Wade said he would look into what the status was of the NGA copyright transfer process for SICD.<\/p>\n
===================================
\n5. Discussion of current draft standard
\n===================================<\/p>\n
Discussion on Marc Trachy’s document giving ideas for changes to make
\nin SICD for this standard.<\/p>\n
1. Replace \/SICD\/ImageCreation with a lineage
\n current SICD image-creation metadata is limited, if change to
\n lineage can put more info there for humans.
\n need exact details.
\n chuck has presented some ideas on this already.
\n chcuk mentioned that error-popagation could also be added.
\n Leland: perhaps we need to survey other SAR formats for what they
\n include.<\/p>\n
2. Remove AMP8I_PHS8I (likely PixelType won’t appear in the IEEE
\n version anyway)
\n Wade has seen it used, so wants to keep it.
\n the ISO range-type could be used instead to describe the structure
\n of the data for each pixel.<\/p>\n
3. \/SICD\/ImageData\/ValidData:
\n Make required and to include no zero filled pixels,
\n (may discard some valid pixels for simplification)
\n check says that there is no ISO concept for this.<\/p>\n
4. \/SICD\/ImageData\/SCPPixel: Allow to be non-integer
\n make it real-valued
\n center of pixel in SICD
\n need to look at implications to other metadata that uses line and
\n column values
\n the PHD std does this<\/p>\n
5. \/SICD\/GeoData\/EarthModel: Replace with an ITRF version?
\n currently required to be wgs84.
\n wgs84 is not precise enough in its definition for some applications
\n replacing with a specific ITRF would be better<\/p>\n
6. \/SICD\/GeoData\/GeoInfo: Remove
\n this is basically a list of “lat, lon, feature description”
\n largely NGA-specific
\n everyone agreed to remove it.<\/p>\n
7. \/SICD\/Grid\/ImagePlane: Remove
\n an enumeration: SLANT, GROUND, other
\n historically has been poorly-populated: inaccurate
\n however, may still be useful for some applications<\/p>\n
8. \/SICD\/Grid\/Type: Document which ones can go with with image
\n formation algorithms
\n info in V3. perhpas include in our std?<\/p>\n
9. \/SICD\/Grid\/TimeCOAPoly: Document more precise definition of center
\n of aperture time
\n OK<\/p>\n
10. \/SICD\/Grid\/*\/ImpRespWid: Remove
\n most other stds have this, but not useful
\n maybe just add more docs on how to use it?
\n code exists on github.<\/p>\n
11. \/SICD\/Grid\/*\/Sgn: Remove (force -1, producers must conjugate if they would have had +1)
\n SICD has 2: 1 for row, 1 for col
\n only 1 would be better, none even better
\n all other phases need to be conjugated if need to change it
\n some producers screwed this up
\n need more docs<\/p>\n
12. \/SICD\/Grid\/*\/KCtr: Either rename to KOrigin (my preference) and force producers to make it constant across the image or make it variable across the image.
\n possible to make constant
\n currently specified as a constant, but it actually varies across
\n the image
\n need to describe the variation across the image
\n cosmo-skymed\/INCA: KCtr is cont across the image,
\n but delta-KCOA is not, in spotlight mode
\n PFA with slant deskew
\n perhaps rename to KOrigin so less confusing, or KZero. Give good defn.<\/p>\n
13. \/SICD\/Grid\/*\/DeltaK1 \/SICD\/Grid\/*\/DeltaK2: Remove
\n limits of spectral support of image in each direction, or nyquist,
\n whichever is smaller
\n not helpful, especially if doing part of an image
\n calculating by yourself is best<\/p>\n
14. \/SICD\/Grid\/*\/DeltaKCOAPoly: Make required
\n everyone agreed to make it required.
\n can be zero, but must be specified<\/p>\n
15. \/SICD\/Grid\/*\/WgtFunct and \/SICD\/Grid\/*\/WgtType:
\n Replace with required consolidated structure where WindowName
\n and WgtFunct are required or force uniform weighting.
\n change to have new class, including:
\n WgtFunct, WindowName, WtFunc
\n and make all required<\/p>\n
16. Add slowtime and frequency 4d grid
\n could take an hour to discuss
\n all possible if know image formation algo.
\n docs do not describe how to do it.
\n have provider do it using their image-formation-algo
\n general agreement, but need more details.<\/p>\n
17. \/SICD\/Timeline\/CollectStart: Change to reference time
\n everyone agreed<\/p>\n
18. \/SICD\/Timeline\/CollectDuration: Remove
\n everyone agreed<\/p>\n
19. \/SICD\/IPP: Make required?
\n difficult to generate from some providers
\n need better docs so it will be populated correctly
\n general agreement<\/p>\n
20. \/SICD\/Antenna\/TwoWay: Remove
\n agreed. just use 2 1-way’s<\/p>\n
===================================
\n6. Other business?
\n===================================<\/p>\n
none<\/p>\n
===================================
\n7. Next meeting
\n===================================
\nthe group wanted to have the next meeting in 2 weeks, at 11am.
\nOur next meeting will be on :
\nThursday, August 13, 11AM Eastern time<\/p>\n
===================================
\n8. Adjourn
\n===================================
\nMarc motioned, Wade seconded. no opposition. passed<\/p>\n","protected":false},"excerpt":{"rendered":"
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