Survey of Advanced Spatial Analysis Techniques

1
Survey of Advanced Spatial Analysis Techniques

• Richard Taketa
• Associate Professor and Chair
• Department of Geography
• San José State University

2
Spatial Analysis

• Examples
• Testing viability of a satellite campus
• Emergency accessibility in Guatemala
• Managing oil leases
• Inferring locations in pre-Hittite Anatolia

3
San Jose State UniversitySouth County Satellite
ExtensionFeasibility Study
4
SJSU Satellite Campus

• South County location Morgan Hill
• Upper division courses
• No lower division general education
• Upper division general education
• Major courses
• A preliminary study
• Used mailing address as surrogate for living
  address
• Address geocoding 80 hit rate
• Majority of misses on campus residents
• Post office boxes

5
(No Transcript)
6
SJSU Satellite Campus

• Road network travel times
• Morgan Hill
• Main campus
• Service areas
• Intersect travel polygons
• Calculate differences
• Map background
• Assign travel times
• Spatial join to students
• Generate counts
• Closer to Morgan Hill
• Majors
• Upper division

7
Emergency AccessibilityOstuncalco,
GuatemalaNetwork Analysis
8
GIS Landslides in Guatemala
Scoured channel on the Río La Lima, Guatemala.
Source USGS
9
Landslides Hurricane Mitch, 1998
10
Accessibility

• Charlie Chapin and Sharon Ordeman
• Evacuation
• Emergency response
• Medical aid
• Relief supplies
• Recovery and reconstruction

11
Accessibility Base map
12
Accessibility Critical nodes
13
Accessibility Connectivity matrix
14
Accessibility Network connectivity
15
Accessibility Network connectivity
16
Accessibility Network connectivity
17
Oil Lease ManagementRecasting the problem
18
Oil Lease Management

• Each well assigned to a 40-acre plot
• New wells
• 40-acre requirement may require shifting plot
  boundaries
• Change in boundary reduces pumping life
• Minimize number of changes

19
Oil Lease Management
20
Topological Representation
21
Oil Lease Management

• Topology
• does not indicate which leases to modify

22
Oil Lease Management

• Topology
• does not indicate which leases to modify
• Topology gt graph

23
Oil Lease Management

• Topology
• does not indicate which leases to modify
• Topology gt graph
• Dual of a (polygon) graph gt network

24
Network Representation
25
Inferring locations in pre-Hittite
AnatoliaDealing with sparse information
26
A Cappadocian Speculation

• Tobler and Wineberg (1971)
• pre-Hittite (circa 1940 BC to 1740 BC) network of
  119 Assyrian merchant colonies in Bronze Age
  Anatolia
• Identified from 819 cuneiform tablets
  (Cappadocian tablets)
• Exact locations not known for many towns

27
A Cappadocian Speculation

• The problem establish the locations of the towns
  from the tablet data.
• Given
• Distances between towns
• Some known locations
• Calculate
• Unknown locations
• How to get the distances?

28
A Cappadocian Speculation

• Spatial Interaction the Gravity Model

29
A Cappadocian Speculation

• Spatial Interaction the Gravity Model
• Since distance is unknown (and what we want)

30
A Cappadocian Speculation

• Spatial Interaction the Gravity Model
• Since distance is unknown (and what we want)
• if we can establish the level of interaction and
  town sizes.

31
A Cappadocian Speculation

• Use data from tablets
• Sixty-two towns occurred on at least two of 754
  tablets
• Mentions as mass
• Mentions (from joint mentions) ranged from 1 to
  101
• Joint mention as interaction
• Joint mentions ranged from 1 to 12
• Connections ranged from 2 to 23
• average 3 per town

32
A Cappadocian Speculation

• Have
• Masses
• Interaction
• Calculate
• Distances
• Add some known locations
• Calculate unknown locations

33
A Cappadocian Speculation
34
A Cappadocian Speculation
35
Spatial Analysis

• Invariably involves many steps
• Often requires creativity

36
Spatial Analysis

• Invariably involves many steps
• Often requires creativity
• Can be a lot of fun