Analysis of Meteorological Weather Stations in Nebraska

1
Analysis of Meteorological Weather Stations in
Nebraska
Ramesh K. Singh Biological Systems
Engineering University of Nebraska - Lincoln
GIS in Water Resources Thursday November 30, 2006
2
Presentation Layout

• Motivation
• Database preparation
• Spatial analysis
• Rainfall
• Temperature
• RH, ET, Wind speed
• Footprint analysis
• Conclusions

3
Available Climatological Map

• Daymet (http//www.daymet.org/default.jsp)
• Temperature, Precipitation, Radiation Humidity
• 1980-1997
• 1000 m grid
• PRISM (http//www.ocs.oregonstate.edu/prism/index.
  phtml)
• Temperature, Precipitation, Dewpoint
• 1895- Current
• 4 km grid

4
Interpolation

• Constructing new data points from a discrete set
  of known data points (http//en.wikipedia.org/wiki
  /Interpolation).

5
Interpolation Techniques

• Deterministic
• Based on mathematical function
• No error estimation
• No randomness involved
• Stochastic
• Based on mathematical and statistical functions
• Error estimation
• Random

6
Interpolation Methods

• Inverse distance weighing
• Deterministic
• First hand approximation
• Spline
• Deterministic
• No prediction error assessment
• Kriging
• Stochastic
• Trend surface
• Stochastic

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Study Area
http//www.enchantedlearning.com/usa/states/nebras
ka/
Go BIG RED!!!
8
Climatic Data

• High Plain Regional Climate Center
  (http//www.hprcc.unl.edu/data.htm)
• Automated weather stations
• 10 years (01/01/1996 - 12/31/2005)
• Stations 52 - 15 13 50

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AWS
(www.hprcc.unl.edu)
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Data into GIS Platform

• Excel to DBF

11
Representative AWS of Nebraska
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Normal Rainfall in Nebraska
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Mean Annual Rainfall in Nebraska (1996-2005)
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Validation of Interpolation Methods
15
Trend of Normal and Mean Rainfall in Nebraska
(1996-2005)
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Effect of No of Stations
17
Change Dynamics of Rainfall in Nebraska
(1996-2005)
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County wise Analysis of Rainfall
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Countywise Analysis of Rainfall
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Conclusions

• Normal rainfall in Nebraska 23.33
• Max. in Richardson county (30.43)
• Min. in Sioux county (16.21)
• Mean annual rainfall (1996-2005) 19.23
• Max. in Richardson county (30.86)
• Min. in Sioux county (12.09)

21
Acknowledgement

• Dr. S. Irmak
• Dr. A. Irmak

22
Thanks..