CS 128/ES 228 - Lecture 13b 1

Spatial Analysis – A Case Study

Patrick KishClass project for Resource

Management 591

West Virginia University14 Dec 2001

CS 128/ES 228 - Lecture 13b 2

Problem Landslides are present in certain

areas of West Virginia

Question: How much of a determinant is land slope in this matter?

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Where to begin? West Virginia

Landslide and Slide Prone Areas map

Paper only so scanned in

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What to add?

DEMs available at different resolutions

10 meter and 30 meter resolution DEMs imported

Also a Geology map and a DOQQ

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Adding relevant data Landslide

polygons added through “heads up” digitization

Attribute table used for determining area of slides

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Hypothesis

Slope has something to do with the prevelance of landslides

Literature suggests that 35 degrees is a critical value

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Getting Slope Information ArcMap’s Spatial Analysis was

applied to DEMs

Slope shown by color – degree values in Table of Contents

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30 meter resolution

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10 meter resolution

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More interesting analysis Intersecting slope map with slide

polygons layer allows us to determine average slope of a slide

Determined to be 34.81 degrees

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Further filtering – 10 m

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Further filtering – 30 m

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Final product

What layers should be included?

How should they be arranged?

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A Useful Map?

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Intriguing Questions

Why doesn’t 30 m map do “better”?

What role does geology play? What about soil type?

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BIBLIOGRAPHY All figures (and details about the study)

were taken from:

http://www.nrac.wvu.edu/rm493-591/fall2001/students/kish/ The%20Use%20of%2010%20Meter%20and%2030%20Meter%20Digital%20Elevation%20Models%20for%20Determining%20Areas%20Susceptible%20to%20Landsliding%20in%20the%20Morgantown%20N.htm

Alas, as with so much data on the Internet, this has proven transitory. A Google search will find this URL for you, but the only remaining record is a Master’s thesis on the subject which is only available from on the WVU campus.