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GIS, GeoObjects, and Monte Carlo
Simulation: A Match Made in
Heaven
(or )?
Daniel Opdyke
December 2, 1999
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Acknowledgements
UT:Dr. Maidment
Kim Davis
Tim Whiteaker
Lesley Hay Wilson
Andrew Romanek
Julie Kim
ESRI:Maggie Ruan
Rob Burke
Evan
My apologies to anyone I missed…
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Outline
Objective
Marcus Hook
Groundwater Modeling
Monte Carlo Simulation
GeoObjects
Results
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Objective
Plot time series data
Why?GIS typically displays only spatial data
How?Create GeoObject and place in ArcMap
Run groundwater model
Associate model output with specific object
Give object ability (method) to plot model output
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Marcus Hook Refinery
Why?Already createdby Andrew Romanek,et al.
Used inexercise 8
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Groundwater Model
Model developed for my dissertation
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Monte Carlo Simulation
Brute force method to translate uncertainty in inputs to uncertainty in outputs.
Input values drawn from
assumed probability
distributions.
Model: C = A + B
A is N(0,1), B is N(10,1)
Iteration 1: C = -0.12 + 9.87 = 9.75
Iteration 2: C = -0.33 + 10.52 = 10.19
…ad nauseam
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GeoObjects
You know ‘em, you love ‘em
Created HelloWorld objectOnly one custom property: “name”
• didn’t work, used OID instead
Has interface – this works as a handle for VBA
Methods written in VBA in ArcInfo, not C++
• Highly flexible and easy to revise/update
Feature
HelloWorld
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Groundwater Elevations and HelloWorld Object (the POD)
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Selection of Source Area and POD Locations
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Running the Model
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Raw Results - MSGraph
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Results
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Conclusions
ArcInfo 8.0 can interact with other COM compliant software packages
Can be used to drive tons of applications including Excel, Word, MSGraph, @Risk, FrontPage. Not Fortran Example, VBA code in ArcInfo runs a model and automatically updates both an Access database and a web page with the result so multiple users can get results in real time.
-- and vice versa --
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