AQ 2007 10 31 Discussion

[to 2007-10-31 Workshop page]

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Data/tool Decision Tree

--wonder if we could set up table comparing products --might segment by datasource, visualization tool, processing tool, etc.

Usage considerations

Legal

• EPA always has to defend its judgments in court
• Court needs "preponderance of evidence" or "beyond a reasonable doubt"

--This is quite different from 0.95% certainty.

Science

• Needs detailed information about sources and models used in "correcting" data

Education

• Special considerations for "real-time" data
• Special considerations for hiding and introducing complexity

Data lineage tracking

• Do we need to coordinate use of conventions, even in readme files, for tracking observations?
• How do we track sources and magnitude of variance within and across datasets throughout the processing chain?
  • Take as an example the case x and y variance are not the same.
• Can we list sources of variance that must be taken into consideration as we visualize or composite datasets?
  • Cloud cover
  • Registration issues
  • Instrument issues
    • resolution
    • interference (NOx)

Data quality considerations

• What is the best way to determine "best available evidence"?
  • How do we know if a remote sensing product has been verified with ground data and in situations comparable to use?