Fogeys

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Lecture 26 GIS-Based Geograhic Modeling
(An Urban Application)
1. The Problem (Question)
Fogeys R Us is a health care consortium that
specializes in geriatric care. They want to open
at least 4 walk-in clinics in the Metro Toronto
area to specialize in health care for the elderly
(over 50 years of age). The clinics would be one
of two types general health clinics covered by
OHIP (public clinics hereafter) and high-end
clinics that would offer specialized treatments
not necessarily covered by public insurance
(private clinics hereafter). The company would
prefer to avoid expensive land purchases and
rezoning disputes if at all possible.
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Lecture 26 GIS-Based Geograhic Modeling
(An Urban Application)
2. Think through the problem (Conceptualization)
2.1 Question and Requirements Determine the
prospective areas for the 4 clinic locations
for old people. 2 public clinics cares
covered by OHIP 2 private clinics cares
not covered by OHIP The clinics should be on
areas of cheap land and zoned for commercial
purposes
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2. Think through the problem (Conceptualization)
(continued )
2.2 Analysis of the Question and Requirements
For public clinics Put them in areas
where Low land values and, (What is
low?) Land zoned for commercial and
Surrounded by (What is meant by
surrounded?) High percentage of
population over 50 (What is high?) For private
clinics Put them in areas where
Low land values and, Land zoned for
commercial and, Surrounded by
High percentage of population over 50 and,
High income and, (What is high income?)
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2. Think through the problem (Conceptualization)
(continued )
2.3 Essential Data Layers For the Public
clinics - A map showing where the high
percent of old people are - A map of land
values - A map of zoning For the
Private clinics - In addition to the
above, a map showing the distribution
of high income people 2.4 Primary Data Layers
Census data Assessed land value map
Zoning map 2.5 Data Sources Statistics
Canada Assessors office City Planning
department (Conceptualization Diagram)
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3. Solve it using GIS (Implementation)
3.1 Think through the steps (Virtual
Implementation) 1) Data input and data
preparation (compiling the database of
primary data layers) Digitizing (paper
maps) Geocoding (data in records such as
land values) Alignment (geo-referencing/re
gistration) 2) Generate the data layers of
essential information Map of high percent
of old people (from Census Data) Map of
low land value (from Assessors record)
Map of Zoning (from Planning office) Map
of high income (from Census Data)
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3. Solve it using GIS (Implementation)
(continued )
3.1 Think through the steps (Virtual
Implementation) (continued ) 1) Data input
and data preparation (compiling the
database of primary data layers)
Digitizing (paper maps) Geocoding (data
in records such as land values) Alignment
(geo-referencing/registration) 2) Generate the
data layers of essential information Map
of high percent of old people (from Census Data)
Map of low land value (from Assessors
record) Map of Zoning (from Planning
office) Map of high income (from Census
Data)
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3. Solve it using GIS (Implementation)
(continued )
3.1 Think through the steps (Virtual
Implementation) (continued ) 3) Produce the
suitability map For public clinics
(1) Combine the land value with the zoning data
layers to produce one data layer
which shows the potential locations
of the clinics. (2) For each potential
location, find out the number of
areas with high percent of old people around the
site (3) Rank the sites by the number of
areas with high percent of old
people around the site
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3. Solve it using GIS (Implementation)
(continued )
3.1 Think through the steps (Virtual
Implementation) (continued ) 3) Produce the
suitability map (continued ) For private
clinics (a) Combine the land value
with the zoning data layers to
produce one data layer which shows the potential
locations of the clinics.
(b) For each potential location, find out the
number of areas with high percent
of old people and with high income
around the site (c) Rank the sites by
the number of areas with high percent
of old people and high income around the site
(Virtual Implementation Diagram)
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3. Solve it using GIS (Implementation)
(continued )
3.2 Develop a detailed plan (Pseudo codes)
(Example of Pseudo Coding) 3.3 Do it
using a specific GIS software
4. Work through a couple of locations to verify
(The Result Figure)
(Question Are there other ways of selecting the
sites?)
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Questions (Lectures 25-26)
1. What is Spatial Modeling? What is GIS-based
Spatial Modeling? 2. What are the steps in
spatial modeling using GIS? 3. What is
conceptualization and what is implementation? 4.
Why do people say that domain knowledge is
extremely important in GIS-based spatial
modeling? Give an example.