introduction to gis ghassan mikati, ph.d gis expert
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Introduction to GIS
Ghassan Mikati, Ph.D
GIS Expert
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A computer system which can hold and use data
describing places on the earth's surface.
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What is GIS?GIS is:
A mapping software – such as Electronic Atlas:It displays pictures of geographic areas on the computer
It provides information about these areas
It provides ability to alter graphics
And even more than that, it has the ability:To create graphics using information database
To import external information & databases
To use tabular information to create charts & graphs
And to analyze information statistically
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Components of GIS
Database
Computer Hardware & SoftwareOrganizational
Structure & People
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Components of GIS
Hardware: the computer on which GIS operates
Software: which provides the
functions and tools needed to store,
analyze, and display geographic
information.
Data: geographic data & related
tabular data
People: GIS users who range from
specialists to simple users
Methods: a designed plan and business rules
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Raster vs. Vector GIS works with two models:
Vector: information is encoded
and stored as a collection of
x,y coordinates
Raster: comprises a collection
of grid cells
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GIS stores information about the world as a collection of thematic layers that can be linked together by geography
GIS Layers
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On a Map…Every object is called Map Feature…
Roads
Park River
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Geographic Features
Geographic features are represented by two types of data.
SPATIAL DATA ATTRIBUTE DATA
Street NameAddress range on leftAddress range on rightLength to travelDirections to travel
Street NameAddress range on leftAddress range on rightLength to travelDirections to travel
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On a Map…Map features are represented as points, lines or areas…
Roads
as lines
Park & River as areas
Sites
as points
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Related Information…GIS stores all descriptive information about features as attributes in a GIS database.
Each column stores a different attribute
Each row relates
to a single feature
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The Map/Table linkAny change in the attribute table is reflected on the map.
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The Map/Table link
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Features & AttributesSets of features and attributes together are called themes:
RiverParksBuildings
Roads
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GIS DatabaseAll themes together make the GIS database
River
Parks
Buildings
Roads
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On a Map…Map scale controls the size of features and shapes used to represent them, i.e. when map scale increases, so does the size of the map feature.
Roads as lines
Roads as polygon
City as point
Building
as polygon
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Getting Answers to QuestionsWith GIS we can:
Get information about features
Find features based on their attributes
Analyze features locations
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Here we are seeking to find out what exists at a particular location.
A location can be described in many different ways using, for example, place name, or latitude and longitude coordinates
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Identifier: 565-88-221
Area: 108,900,245
Owner: John Morris
Address: 3233 Texas St.
Zoned land use: Industrial
Assessment: $950,000
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Getting other types of information about a feature
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Instead of identifying what exists at a given location, you want to find a location where certain
conditions are satisfied. For example, you wish to find a house assessed at
less than $200,000 with 4 bedrooms and made of wood.
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Map
Find features based on attributes they share
4 Bedrooms
More than a certain area
Within a
certain price
Result
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This seeks to discover the differences between an area as the result of the
passing of time.
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City in 1950 City in 1990
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This seeks to discover what types of patterns may exist in the newly created data file
that were not visible before. For example you may wish to know where motor vehicle accidents occur and at what
times.
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What kinds of patterns exist for motor vehicle accidents?Where do they occur and at what times?
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GIS locates features with regards to their location to each other:
Features adjacent to…
Features within a certain distance
Features within a certain area
Etc…
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Looking for an apartment within 0.5 km from high school
Schools
High SchoolApartments
for sale
Apartments
for sale
within
0.5 km
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Major Areas of Practical Application of GIS Technology
vehicle routing and schedulinglocation analysis, site selectiondevelopment of evacuation plans
Street Network-Based
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• locating underground pipes, cables
• balancing loads in electrical networks
• planning facility maintenance• tracking energy use
Facilities Management
Major Areas of Practical Application of GIS Technology
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• zoning, subdivision plan review• land acquisition• environmental impact statements• water quality management
Land Parcel-Based
Major Areas of Practical Application of GIS Technology
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• forest management• habitat, migration routes management• wild and scenic rivers preservation• recreation resources planning• wetland preservation• agricultural lands management• groundwater modeling and
contamination tracking
Natural Resource-Based
Major Areas of Practical Application of GIS Technology