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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. 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

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  1. NASA / E&O Project Meeting April 23, 2013 George Cooper

  2. 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

  3. 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

  4. 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

  5. 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?

  6. 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?

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