The following notes were taken by Elizabeth Rye. Corrections are welcome.

Planetary Data System Standards Teleconference
8 June 2005 9-11 AM

Steve Adams (EN)
Mitch Gordon (RINGS)
Ed Guinness (GEO)
Steve Joy (PPI)
Ron Joyner (EN)
Sean Kelly (EN)
Todd King (PPI)
Anne Raugh (SBN)
Elizabeth Rye (EN)
Dick Simpson (RS)
Susie Slavney (GEO)

Quick status report on the MeetingPlace interface. (Sean Kelly)

SCR 3-1006 Directory Naming Conventions

Click here to view version of SCR under discussion.

The SCR, as written, will be modified in the following ways:

SCR 3-1001 Add SEARCH_NOTE as a Data Element

Click here to view version of SCR under discussion.

The general consensus was that adding this keyword to labels would not fix the problem it was designed to solve, that of enabling a Google-type search on PDS data. (Fundamentally, there is no practical way of implementing it.) It was noted that SBN data may be unique enough that they will need to implement a node-specific solution to their search problems. Some lukewarm interest was expressed in continuing to discuss how to enable these types of text-based searches, but no one volunteered to be on a tiger team.

SCR 3-1004 Wavelength Regime

Click here to view version of SCR under discussion.

The consensus on this SCR was that adding an INSTRUMENT_DETECTOR object to the INSTRUMENT catalog object will provide little value for searching. This mechanism would provide the entire wavelength range of an entire data set, which is of little use when searching for specific data products within a specific range. A counter suggestion was made to provide individual wavelength keywords in each product (sample values: IR, FAR-IR, etc). The idea of making them required was firmly rejected.

Since MINIMUM_WAVELENGTH and MAXIMUM_WAVELENGTH keywords already exist, it was suggested that no further action is needed since teams can already include these keywords in their product labels. However, since the impetus for this SCR is cross-correlative searches, it was generally recognized that there is a need to standardize values for the keywords across data sets.

Furthermore, not all disciplines use the same nomenclature for identifying the wavelength regime they are interested in. Some like to use numerical measurements of wavelength (eg. Angstroms); while others favor general regimes (eg. IR, NIR). Other disciplines abandon wavelength entirely in favor of frequency or energy.

In general, the nodes interested in each regime are as follows:

RS possibly
SBN possibly
SBN possibly

Finally, Todd pointed out that there is a recent ISO document standardizing the names for various wavelength regimes:

ISO 21348 Definitions of Solar Irradiance Spectral Categories

(If you have any difficulty downloading this document, please contact Todd directly.)

Dick pointed out that the radio community uses these conventions, as well as including five additional categories at frequencies below 3 MHz.

Action is for Elizabeth to attempt to write a greatly simplified version of this SCR standardizing use of the wavelength, frequency, and/or energy keywords to assist with correlative searches.

Discussion on Keyword Approval Process

Click here to view flow diagram under discussion.

Elizabeth will revise the diagram (or more likely re-write it as a policy document, with noted updates). Revised process will be reviewed at next telecon.


Agenda for future meetings: