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Understanding the Four Basic Types of Analysis
Paul Trevillion - Esri
Michael Sarhan - Esri
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What are the four basic types of analysis?
• Proximity
• Overlay
• Statistical
• Temporal
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Michael Sarhan
Proximity
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What is proximity analysis?
Buffer zones around a schoolBuffer zones around a school
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How do ArcGIS tools measure proximity?
Euclidean distanceGeodesic Least-cost path
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Categories of Proximity Analysis
• Area Expanding
• Numeric value
• Linear Measure
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Paul Trevillion
Proximity Demo
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Paul Trevillion
Overlay
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Vector Overlay
Which Schools have the most incidents crime
nearby?
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Overlay techniques
OR
Union
Identity
Intersect
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Apportioning attributes
Before splitBefore split
dfbdfbdfb100100 100
Without ratio policyWithout ratio policy
100
100
100
100
100
100
With ratio policyWith ratio policy
70 3050
30 50 70
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Raster Overlay
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Michael Sarhan
Overlay Demo
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Michael Sarhan
Statistical Analysis
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Types of Statistical Analysis
Descriptive Statistics Inferential Statistics
Percent of Total Crimes by Ward in the District of Columbia Hot Spot Analysis weighted on Violent crime in the District of Columbia
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Descriptive Statistics
Mean CenterMean center
total crime by Quarter CY 2014
Mean center total crime by
Quarter CY 2014
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Descriptive Statistics
Standard Deviational
Ellipses
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Working with data distributions
• Normal and statistically significant distributions
Normal distributionNormal distribution
Standard deviation
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Inferential Statistics
Average Nearest Neighbor SummaryAverage Nearest
Neighbor Summary
The Average Nearest Neighbor tool
Dengue fever casesand households
Dengue fever casesand households
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Inferential Statistics
• Measures distribution of features and attribute values
Spatial Autocorrelation
Report
Spatial Autocorrelation
Report
The Spatial Autocorrelation tool
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Inferential Statistics
Hot spot analysis
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Paul Trevillion
Statistics Demo
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Paul Trevillion
Temporal Analysis
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What is temporal analysis?
Spatial VariancepH levels measured and analyzed for entire reservoir on same day
Spatial VariancepH levels measured and analyzed for entire reservoir on same day
Temporal VariancepH levels measured and
analyzed at one location each year
Temporal VariancepH levels measured and
analyzed at one location each year
7.0
6.9 7.1
7.0
6.8
7.0
6.7 6.7
6.9
2009 – 6.62010 – 6.72011 – 6.8
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Incorporating time in your analysis
Political violence in Somalia 1997-2011
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Temporal patterns and spatial statistics
1969 1985 2002
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Space-time analysis vs. time snapshots
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Michael Sarhan
Temporal Demo
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