a. goodchild cee 587 25 april 2011. 2/14 geographic information system integrates spatial and...
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GIS and Network Analyst
A. GoodchildCEE 587
25 April 2011
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What is GIS? Geographic Information System
Integrates spatial and non-spatial data• Spatial (where something is)
• Non-spatial (name, number of residents, speed limit)
Great for making maps and analyzing spatial data
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Uses of GIS Examining density
Finding locations
Illustrating spatial information
Routing & directions
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Uses of GIS: Example
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Gregerson, J. , Hepp-Buchanan, M., Rowe, D., Vander Sluis, J., Wygonik, E., Xenakis, M., and E. McCormack. (2010) Seattle Bike Share Feasibility Study. University of Washington, Seattle, WA.
GIS Data Organization Uses layers for different data sources
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GIS data types Two types of spatial data:
• Raster• Vector
Many types of non-spatial data
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GIS spatial data typesRaster Representation
0 1 2 3 4 5 6 7 8 90 R T1 R T2 H R3 R4 R R5 R6 R T T H7 R T T8 R9 R
Vector Representation
line
polygon
point
Alberti, Marina. Class Lecture. Urban and Regional Geo-spatial Analysis: Principles of GIS. University of Washington, Seattle, WA. 30 September 2009.
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GIS data types Two types of spatial data:
• Raster A grid of cells for an entire area, cell determines
location
One value for each grid cell
Best for attributes with continuous features
• Vector
Many types of non-spatial data
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GIS data types Two types of spatial data:
• Raster• Vector
Data located by coordinates
Referenced to attribute table
Best for features with discrete boundaries
Many types of non-spatial data
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Attribute (non-spatial) data is associated with spatial vector data
Attribute data
PIN
Name Owner # of Orders
101
GMC Dr. Goodchild
32
102
STAR Dr. Wang 17
103
TDF Dr. Chen 123
104
GreenRd
Dr. Muench 57
Attribute/Non-spatial DataSpatial Data
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Network Analyst Combines spatial & non-spatial data
Optimizes using routing algorithms to find solutions
Can identify:
• Catchment/service area• Shortest or fastest route• Nearest facility
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Network Analyst:
Example 1
Delivery Vehicle RoutingSandoval, Felipe and Anne Goodchild. Research in Progress.
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Network Analyst:
Example 2
Grocery Store Service AreasWygonik, Erica and Anne Goodchild. Research in Progress.
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Network Analyst Class Exercise
Complete the Network Analyst Tutorial:
http://webhelp.esri.com/arcgisdesktop/9.2/pdf/Network_Analyst_Tutorial.pdf
Complete the in-class assignment
Let me know if you have questions