Gis

Geographical Information System (GIS)
Presented By-
SUMEET KUMAR PATTANAIK

Objective
 What Is GIS?
 Principle Of GIS.
 Function Of GIS.
 Components Of GIS.
 Type Of GIS.
 Advantages Of GIS.
 Applications Of GIS.

“GIS is a computer system capable of
assembling, storing, manipulating, and
displaying geographically referenced
information, i.e. data identified according to
their locations.”
“A GIS is an organized collection of computer
hardware, software, geographic data, and
personnel to efficiently capture, store, update,
manipulate, analyze, and display all forms of
geographically referenced information.”
What is gis ?

Principle:Data Capture
Data sources are mainly obtained from manual digitization and
scanning of aerial photographs, paper maps, and existing digital
data sets.
Database Management and Update
data security, data integrity, and data storage and retrieval, and
data maintenance abilities
Geographic Analysis
The collected information is analyzed and interpreted
qualitatively and quantitatively.
Preparing Result
One of the most exciting aspects of GIS technology is the variety
of different ways in which the information can be presented.

Functions:Data Capture
The input of data into a GIS can be achieved through many
different methods of gathering. For example, aerial photography,
scanning, digitizing, GPS or global positioning system is just a few of
the ways a GIS user could obtain data.
Data Storage
Some data is stored such as a map in a drawer, while others, such
as digital data, can be as a hardcopy, stored on CD or on your hard
drive.
Data Manipulation
The digital geographical data can be edited, this allows for many
attribute to be added, edited, or deleted to the specification of the
project.
Query And Analysis
GIS was used widely in decision making process for the new
commission districts. We use population data to help establish an
equal representation of population to area for each district.
Visualization
This represents the ability to display your data, your maps, and
information.

Data Types :
•Vector
•Points
•Lines
•Polygons
•Raster
•Cell
•Pixels
•Elements

VECTOR:
Points, lines, polygons
More closely resembles real world

Raster
•Areas broken into ‘pixels’ or cells
•Each cell contains data
•Good at representing dense data
•land cover
•elevation

Advantages (Vector)
•Good Representation of data.
•Use small File Size.
•Accurate map output.

Disadvantages (Vector)
•Complex Data Structure.
•Expensive Technology.
•Analysis is Complex.

Advantages (Raster)
•Simple Data Structure.
•Cheap Technology.
•Analysis is Simple.
•Same grid cell for several attributes

Disadvantages (Raster)
•Large Data Volume.
•Inefficient use of computer storage.
•Difficult network analysis.
•Less accurate or attractive maps.
•Loss of information when using large
cells.

Advantages of GIS
•GIS allows us to view, understand, and visualize
data in many ways that reveal relationships,
patterns, and trends in the form of maps, globes,
reports, and charts.
•A GIS helps you answer questions and solve
problems by looking at your data in a way that is
quickly understood and easily shared.
•GIS give the accurate Data.
•Better Predictions and Analysis.

Disadvantages of GIS
•Excessive damage in case of internal fault.
Long outage periods as
Repair of damaged part at site may be
difficult.
•Expensive software.
•Integration with traditional map is
difficult.

Conclusion
•GIS has provided to be a really useful
application, its evolution with the changing
times has been totally progressive.
• With the changes in the latest hardware’s
and the software’s GIS will be used for the
best of its purposes.

Gis

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