Footprint Analysis of Weather Stations

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Footprint Analysis of Weather Stations
GIS Water Resources

• Prepared by Octavio Lagos,2006

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A Weather Station

• Air Temperature
• Relative Humidity
• Wind Direction/Speed
• Solar Radiation
• Precipitation

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R. Allen, 2006 Hsieh et al, 2000
FFraction of vapor and sensible heat flux at
height z contributed by fetch over upwind
distance Xf.
z
F
Xf
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Point of Maximum Influence
Max
X
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Objective

• Create a raster image with the footprint of a
  weather station using Arc-GIS and the Hsieh model.

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Location
South Central Agricultural Laboratory, Clay County
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Y
Z
Distance
q
X
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Microsoft Office Excell
Microsoft Visual Basic
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ArcGIS 9.1
Spatial Analyst Tools
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Footprint for one day, July 22 2005
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Growing Season, May Oct 2005
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Points of Maximum Influence, May Oct 2005
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Conclusions

• The model may serve as a first approximation to
  estimate the impact of an area on measured air
  temperature and RH.
• Limitations Topography, obstacles, there is a
  need for model validation.

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Acknowledges

• Dr. S. Irmak, Assistance Professor BSE
• Dr. A. Irmak