Presentation on Geographical Information Systems

Basic concepts of Geographical Information Systems

1. Geographical Information
System (GIS)
Basic concepts

2. Arc/Info
ArcGIS
Application areas:
https://gis.usc.edu/blog/how-mapping-is-used-by-nasa-applications-of-gis-in-space/
WIDELY USED COMMERCIAL SOFTWARE

3. Geographical representation of
real world phenomena
What is there at the earth surface?
(Landuse/Landcover)
Where it is? (locational information)

4. Geographical representation of
real world phenomena
In terms of
•Their position with respect to a known co-
ordinate system
•Their attributes that are unrelated to position
•Their interrelationships with each other which
describes how they are linked together

5. Where did GIS come from?
•GIS is built upon knowledge from
geography, cartography, computer science
and mathematics
•Geographic Information Science is a new
interdisciplinary field built out of the use
and theory of GIS

7. Definition 1: A GIS is a toolbox
"a powerful set of tools for storing and
retrieving at will, transforming and
displaying spatial data from the real world
for a particular set of purposes"
(Burrough, 1986, p. 6).
"automated systems for the capture,
storage, retrieval, analysis, and display of
spatial data." (Clarke, 1995, p. 13).

8. Definition 2: A GIS is an
information system
"An information system that is designed to
work with data referenced by spatial or
geographic coordinates. In other words, a
GIS is both a database system with
specific capabilities for spatially-
referenced data, as well as a set of
operations for working with the data" (Star
and Estes, 1990, p. 2).

9. Dueker's 1979 definition (p. 20)
has survived the test of time.
"A geographic information system is a special case
of information systems where the database
consists of observations on spatially distributed
features, activities or events, which are definable
in space as points, lines, or areas. A geographic
information system manipulates data about
these points, lines, and areas to retrieve data for
ad hoc queries and analyses" (Dueker, 1979,
p 106).

15. Functions of a GIS software
•Data input and verification
•Data storage and database management
•Data output and presentation
•Data transformation
•Interaction with the user

19. Application areas in business
management
•In finding out the perfect geographical
location for their company and industry
•Can assist the emergency management
teams in locating correct address
•Can help insurance company to fix policy
price in flood prone area, earth-quake
prone area etc
•Retail & facility management

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