Evapotranspiration ET Interpolation

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Analysis of Meteorological Weather Stations in
Nebraska
Denis Mutiibwa Biological Systems
Engineering University of Nebraska - Lincoln
GIS in Water Resources Thursday November 30, 2006
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Study Area
http//www.enchantedlearning.com/usa/states/nebras
ka/
Go BIG RED!!!
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• Parameters
• Relative Humidity
• Wind Speed
• Evapotranspiration
• Interpolation
• Kriging
• Inverse Distance
• Spline
• Trend
• Geostatistical Analyst

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Relative Humidity (RH) Interpolation
RH-Kriging
RH-Spline
RH-IDW
RH-Trend
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Wind speed (WD mi/hr) interpolation
WD-Inverse distance weighted
WD- Kriging
WD-Trend
WD-Spline
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Daily Penman (ETo Inches)
Evapotranspiration (ET) Interpolation (Reference)
ETc Kc . ETo Kc is for the crop of Interest
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ET-Inverse distance weighted
ET-Kriging
ET-Spline
ET-Trend
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remarks

• Increasing trend of Relative Humidity
• from East to West.
• Fuzzy Increasing trend of Wind speed
• from East to West
• Increasing trend of Reference Evapotranspiration
• from East to West
• Wind speed is poor interpolated by Kriging,
  Spline
• and Inverse Distance Weighted methods.