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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

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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?


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