geographic information systems (gis) and its · geographic information system (gis) is a...
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Geographic Information Systems (GIS) and ITS
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Outline
• Introduction • What is GIS? • What can we do with GIS? • How does GIS work? • Geography database & types of
data • Features and functionalities of
GIS • Applications of GIS
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We Live in Two Worlds
Self-Regulating Managed
Natural World Constructed World
. . . These Are Increasingly In Conflict
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Context and Content
• Patterns • Linkages • Trends
• Watersheds • Communities • Neighborhoods • Districts
Seeing the Whole Managing Places
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Example
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Example
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What is GIS?
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Geographic Information System (GIS) is a computer-based system including software, hardware, people, and geographic information
A GIS can: create, edit, query, analyze, and display map information on the computer
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Geographic Information System
• Geographic – Most of the data collected is associated with some location in space.
• Information – characteristics (data), can be used to provide
meaningful information about a given location • System – running operation on the information and
associated to the geography – which requires hardware, networks, software, data, and operational procedures
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Who uses GIS? • International organizations
– The World Bank, UNEP, FAO, WHO, etc. • Private industry
– Transport, Real Estate, etc. • Government
– Ministries of Environment, Housing, Agriculture, etc. – Local Authorities, Cities, Municipalities, etc. – Provincial Agencies for Planning, Parks, Transportation,
etc. • Non-profit organizations/NGO’s • Academic and Research Institutions
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What can you do with a GIS?
• The possibilities are unlimited… – Resource management – Land use planning – Water and Sanitation Mapping – Electricity network mapping – Transportation routing – Environmental impact assessment
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How does a GIS work? • GIS data has a spatial/geographic
reference
– Such as:
• a latitude & longitude • a national coordinate system • an address • a district • a wetland identifier • a road name
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Geography and Databases • A GIS stores information about the world as
a collection of thematic layers that can be linked together by geography
Polygon 3 Scrub 17 Very high Clay
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GIS provides Data Integration
Vectors Topology
Networks
Terrain
Surveys
Images
CAD Drawings
Annotation
Addresses
27 Main St.
Attributes
ABC
107’
3D Objects
Dimensions • Roads • Land Parcels • Population • Utilities • Land Mines • Hospitals • Refugee Camps • Wells • Sanitation
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Two fundamental types of data
• Vector – A series of x,y coordinates – For discrete data represented as points, lines, polygons
• Raster – Grid and cells – For continuous data such as elevation, slope, surfaces
• A Desktop GIS should be able to handle both types of data effectively!
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Raster
Vector
Real World
Data Representation
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Data Representation
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Representing Spatial Elements
Raster
Stores images as rows and columns of numbers with a Digital Value/Number (DN) for each cell.
Units are usually represented as square grid cells that are uniform in size.
Data is classified as “continuous” (such as in an image), or “thematic” (where each cell denotes a feature type.
Numerous data formats (TIFF, GIF, ERDAS.img etc)
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Representing Spatial Elements
Raster
• Matrix of cells or pixels • Each cell contains a value
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Representing Spatial Elements
Raster
• The quality of the representation depends on the number of cells
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Vector
Allows user to specify specific spatial locations and assumes that geographic space is continuous, not broken up into discrete grid squares
We store features as sets of X,Y coordinate pairs.
Representing Spatial Elements
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Entity Representations
Points - simplest element
Lines (arcs) - set of connected points
Polygons - set of connected lines
We typically represent objects in space as three distinct spatial elements:
We use these three spatial elements to represent real world features and attach locational information to them.
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• In the raster data model, the cell value (Digital Number) is the attribute. Examples: brightness, landcover code, SST, etc.
• For vector data, attribute records are linked to point, line & polygon features. Can store multiple attributes per feature. Vector features are linked to attributes by a unique feature number.
Attributes
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Raster vs. Vector
Raster Advantages
The most common data format
Easy to perform mathematical and overlay operations
Satellite information is easily incorporated
Better represents “continuous”- type data
Vector Advantages
Accurate positional information that is best for storing discrete thematic features (e.g., roads, shorelines, sea-bed features.
Compact data storage requirements
Can associate unlimited numbers of attributes with specific features
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Other features of a GIS • Produce good cartographic products
(translation = maps) • Generate and maintain metadata • Use and share geoprocessing models • Managing data in a geodatabase using
data models for each sector
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GIS FUNCTIONALITY
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GIS Functions
• Data Assembly
• Data Storage
• Spatial Data Analysis and Manipulation
• Spatial Data Output
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GIS Functions Data Assembly
Maps RSI
Intel Database
Data Transfer
Direct Entry
Data Transfer
Keyboard
GPS
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Data Input/Creation
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Spatial data (ARC functions)
Attribute data (INFO or TABLES functions)
1 (Universe polygon)
2 3
4 5
GIS Storage
3
COV# ZONE ZIP 1 0 2 C-19 22060 3 A-4 22061 4 C-22 22060 5 A-5 22057
GIS Functions
3 A-4 22061
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GIS Functions
• Common Manipulation – Reclassification – Map Projection changes
• Common Analysis – Buffering – Overlay – Network
Spatial Data Manipulation and Analysis
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Spatial Analysis
• Overlay function creates new “layers” to solve spatial problems
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GIS Functions
• Tables
• Maps
• Interactive Displays
• 3-D Perspective View
Spatial Data Output
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The World Geographic Knowledge
Citizens
Inventory
Decision Support
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APPLICATIONS
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GIS Applications
• Site selection – Helicopter Landing Zones – Amphibious Assault (Water Depth) – Buffer Zones – Flight Planning – Battlefield Visualisation
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Helicopter Landing Zones
HLZ sites
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Amphibious Assault Planning
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Spatial Analysis Proximity Analysis (Buffers)
1000 Meter Buffer of Railroads
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Flight Planning
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Flight Planning/Flythroughs
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Battlefield Visualization and/or Situation Awareness
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Other GIS Applications
• Cross country movement – Route planning – Intervisibility study
• Facilities management • Airfield assessment • Road network analysis (convoys) • Propagation coverages • Observation post siting analysis • Perspective views
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CCM Analysis
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CCM & Viewshed
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Facilities Management
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Airfields
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Network Analysis
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Antenna Propagation Coverage
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Trajectories Representation of Mobile Users
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Perspective Views