expanding the effectiveness of the cassini archive data...calibration, geometry, and ring optical...

1

PDS ATMOS

Kathryn Weld Cassini Science and Uplink Manager Jet Propulsion Laboratory OPAG Meeting – Atlanta, GA

January 11, 2013

Expanding the Effectiveness of

the Cassini Archive Data

2

PDS ATMOS

AGENDA

• Key Data Usability Issues

• Cassini’s Solution

• Data Usability Products

• Cassini Archive Support Page

• Cassini’s Results

• Future Archive Thoughts

3

PDS ATMOS

Key Data Usability issues identified by non-Cassini scientists

Difficulty in locating

Cassini data

Confusion in understanding the

data formats

Complexity in calibrating the data

Absence of spacecraft pointing and trajectory data

Absence of cross-cutting search

capability

Lack of derived higher order products

4

PDS ATMOS

Cassini’s Solution

FY11-FY12 Data Usability funding approved by NASA

Partner with the Planetary Data System (PDS)

Generate & Validate Cassini Data Usability Products

Instrument Data Users’ Guides

Instrument Higher Order Products

New & Modified PDS Search Tool Features

PDS Search Aids

Supply Requirements and Lessons Learned to PDS for

Future Missions

5

PDS ATMOS

Data Usability Products


Requirements generated jointly by Cassini & Planetary Data System

Unique Cassini Instrument Information:

• characteristics and limitations

• science objectives

• planning strategies

Description of data formats

Techniques for finding the right data

Techniques for calibrating the data

Step-by-step instructions: find data, calibrate it, produce published result

All Users’ Guides Peer Reviewed by PDS & Non-Cassini Scientists

**Latest Status of Users’ Guides in Backup Material**

Issues Addressed

Difficulty in locating Cassini data

Complexity of calibrating the data

Confusion in understanding the data formats

6

PDS ATMOS



Candidate Products identified by PDS Node Scientist & Cassini Instrument Teams

Candidate Products prioritized through joint PDS/Cassini effort

Higher Order Products for Cassini Optical Remote Sensing Instruments

Higher Order Products for Cassini Fields and Particles Instruments

Higher Order Products for Huygens Probe Instruments

All Higher Order Products Peer Reviewed by PDS and Non-Cassini

Scientists

**List of Higher Order Products in Backup Material**

Lack of derived higher level products

Complexity of calibrating the data

Confusion in understanding the data formats

Issues Addressed

7

PDS ATMOS


New & Modified PDS Search Tool Features PDS Node Search Tool evaluations

Cassini tested all PDS Node search tools for usability.

Submitted report to PDS on anomalous functions; PDS fixed broken links and

inaccurate data.

PDS search tool updates for Cassini Optical Remote Sensing (ORS)

Instrument data

OPUS: http://pds-rings.seti.org/search

• Additional search for surface features on Saturn and satellites

• ISS, VIMS and UVIS data sets now searchable. CIRS search capabilities limited for

now, pending upcoming re-release of data set.

ISIS3: http://isis.astrogeology.usgs.gov/index.html

Extended capabilities to enable geometric projection and mosaicking of ISS and

VIMS ring data.

Absence of Cross-Cutting Search Capability

Difficulty in locating Cassini data across PDS nodes

Issues Addressed

8

PDS ATMOS


Cassini Archive Support Page within the PDS

http://atmos.pds.nasa.gov/data_and_services/atmospheres_data/Cassini/Cassini.html

Central access point to Cassini archive and support data

Includes search aids for different ways to search for Cassini data:

Science Activity descriptions and timing

Timing of geometric events and related trajectory data

Science Activities sorted by Cassini Science Discipline

Products related to the Cassini Instruments

• Links to Cassini Instrument Data Users’ Guides

• Links to Cassini Higher Order Products

• Links to OPUS and ISIS Search Tools

• Links to Cassini Archive Volumes in the PDS

Absence of spacecraft pointing and trajectory data

Difficulty in locating Cassini data across PDS nodes

Absence of Cross-Cutting Search Capability

Issues Addressed

9

PDS ATMOS

Cassini Archive Support Page

10

PDS ATMOS


TIME & GEOMETRIC INFO

Solstice Mission Inclination Profile

Ways to Search using the Support Page

Pariapse parameters Timing of Dust Hazards

Ring Plane Crossings

11

PDS ATMOS


SCIENCE DISCIPLINES

Ways to Search using the Support Page

Ring Segment Events Enceladus Activities

Magnetopause/Bow Shock Events Timing when Cassini was within 10Rs

12

PDS ATMOS


INSTRUMENTS

Titan Shape Model

Complete list of Radar Activities ISIS 3

The Cassini Archives (PDS Nodes)

Radar Data Users Guide

1

2

3

4

5

6

Search example using the Support Page

13

PDS ATMOS

Data Usability Issues versus Cassini Solutions

Instrument Data Users’

Guides

Instrument Higher Order

Products

Updated PDS Search Tools


Difficulty in locating Cassini Data √ √ √

Absence of Cross-cutting Search Capability √ √

Confusion in understanding the data formats √ √

Complexity of calibrating the data √ √

Absence of spacecraft pointing and trajectory data √

Lack of derived higher order products √

14

PDS ATMOS

Future Archive Thoughts


• Project to continue adding helpful search aids - files, charts, etc.

• Work in progress – feedback to Reta Beebe http://atmos.nmsu.edu/.

Documented Cassini Requirements to PDS for future project use

• Instrument Data Users’ Guide Requirements

• Project Archive Support Page Requirements

Key Lessons Learned from Cassini’s perspective:

• Search requirements to link planned science activities to archived

products should be generated and implemented early in the mission.

• Calibrated data should be a key requirement due to its higher value over

raw data with calibration tools.

• Budgets permitting, some derived higher order products should be flagged

as planned archive deliverables.

• Data product formats should be standardized across all instruments to the

extent practical.

15

PDS ATMOS

Team Acknowledgement

Reta Beebe – PDS Atmospheres Discipline Node Manager

Daniel Crichton – PDS Engineering Node Manager

Sean Hardman – PDS Software Engineer

Mark Showalter – PDS Rings Node Manager

Susan Linick – Cassini Instrument Operations Manager

Julia Henricks – Cassini Project Software System Engineer

Sheila Chatterjee – Cassini Archive Engineer

Linda Spilker – Cassini Project Scientist

Kathryn Weld – Cassini Science and Uplink Manager

16

PDS ATMOS

Backup Material

17

PDS ATMOS



Ten Instrument Data Users’ Guides funded and delivered to the PDS

o Two funded through NASA Grants

• Radar Instrument

• Ultraviolet Imaging Spectrograph (UVIS)

o One funded partially through CDAP and partially through Cassini funds

• Ion and Neutral Mass Spectrometer (INMS)

o Seven fully funded through Cassini Data Usability funds

• Cassini Plasma Spectrometer (CAPS)

• Cosmic Dust Analyzer (CDA)

• Composite Infrared Spectrometer (CIRS)

• Imaging Science Subsystem (ISS)

• Magnetometer (MAG)

• Magnetopheric Imaging Instrument (MIMI)

• Descent Imager/Spectral Radiometer (DISR)

Two Instruments using other products as instrument guides

o RPWS Software Interface Specification document contains necessary info.

o VIMS using ISIS3 tool as search guide.

Radio Science (RSS) users’ guide still under development.

18

PDS ATMOS


Automated process; will continue production through EOM

Cassini

Optical

Remote

Sensing

Instruments

CIRS Image cubes in latitude/longitude and RA/DEC space that can be readily correlated with geographical

features. Backplanes containing geometrical data for each pixel also provided.

RADAR Titan global shape model.

RSS Calibration, geometry, and ring optical depth profile files pertinent to all RSS X-band ring occultations

completed during the Cassini Prime Mission.

VIMS Reduced & calibrated optical depth profiles for Saturn's rings derived from VIMS stellar occultation

observations in Cassini Prime and Equinox Missions.

Huygens

Probe

Instruments

Huygens –

All inst.

A single Huygens instrument data timeline (time relative to each other), and documentation that describes

some of the instrument performance issues and idiosyncrasies during the data collection period.

Huygens –

DISR

Appendix to the Users Manual, describing the format of the DISR binary data. Collection of the DISR tools

and ancillary IDL routines. Collection of DISR ground calibration data.

Cassini

Fields and

Particles

Instruments

CAPS Electron density, electron temperature, ion flow velocity and separate density and temperature values for

different ion species.

CDA Deliver 6000 already processed spectra. Tool generated to identify candidate spectra, then process and

calibrate the spectra and place in the CDA archive pipeline.

INMS Titan neutral density profiles and Titan ion density profiles.

MAG

Set of plots of where the spacecraft is relative to the planet and the moons in coordinate systems and

scales. Set of plots where the magnetic field line through the spacecraft intersects the upper atmosphere of

Saturn using field models. Data from SOI through orbits early in 2012.

MIMI LEMMS/CHEMS spectrograms, LEMMS particle pressures and INCA browse products. INCA Movies and

Time Averaged Data Products (for LEMMS, CHEMS, and INCA). Data from SOI through FY12


expanding the effectiveness of the cassini archive data...calibration, geometry, and ring optical...

Documents