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NASA / E&O Project Meeting. April 23, 2013 George Cooper. What I’ve Been Working On Lately. Vectorized algorithms for faster computation Working out a bug in the script, but the first layers should be done once I’ve fixed it

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nasa e o project meeting

NASA / E&O Project Meeting

April 23, 2013

George Cooper

what i ve been working on lately
What I’ve Been Working On Lately
  • Vectorized algorithms for faster computation
  • Working out a bug in the script, but the first layers should be done once I’ve fixed it
  • Researching potentially useful indices of extreme events/climate to deliver
deriveit script
DeriveIt Script
  • Spans time-series layers and produces summary layers of:
    • Cumulative biovariables: Degree days, frost-free days, evapotranspiration
    • Extreme events: Longest period of rainfall/temperature over a threshold, severity of the longest dry season, most extreme temperatures
moving forward
Moving Forward
  • Once I have produced the layers, I want to:
    • Validate estimated features
    • Add more equations for extreme value calculation
    • Incorporate remote sensing information on cloud cover and vapor pressure to correct evapotranspiration / degree-days as needed
layer validation
Layer Validation
  • Is there any data available that I can compare to assess the error in estimated features like degree-days or evapotranspiration?
  • The strategy is to produce layers with the most biologically relevant thresholds (extremes given year-to-year variation, freezing temps, developmental temps) but are there any other categories of events to look at?
extreme value modeling
Extreme Value Modeling
  • In addition to reporting extreme events themselves, would it be valuable to add functionality to compute statistical measures for extreme values:
    • If so, which methods might be most deliverable?
      • GEV distributional parameters
      • Poisson process parameters of sufficiently rare and large events?