Something basic about GIS. What is GIS ? GIS = Geographic Information Systems Three components: Geography – the real world Information – data and information.

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Presentation transcript:

Something basic about GIS

What is GIS ? GIS = Geographic Information Systems Three components: Geography – the real world Information – data and information Systems – technologies

A Definition of GIS GIS = Geographic Information Systems Worboys, 1995: A Geographic Information System (GIS) is a computer-based information system that enables one to efficiently capture, store, update, manipulate, analyze, and display all forms of geographically referenced information.

Functions of GIS Collection Storage & Management Retrieval Conversion Analysis Display

Applications of GIS How GIS can be used: Infrastructure Management Transportation Network Routing Floodplain Management Emergency Response Planning Noise Pollution Analysis Participatory Planning Processes Jobs/Housing Spatial Balance and more …

The GIS Data Model Data Organized by Layers/Themes Digital Orthophoto Streets Hydrography Parcels Buildings Zoning Utilities Administrative Boundaries

The GIS Data Model Layers Integrate Using Explicit Location on the Earth’s Surface

Types of GIS Data Describes Objects In Terms Of: Spatial Data Absolute X,Y Coordinates – Locations Size, and Shape Attributes Characteristics associated with Geography

GIS Associates Spatial and Attribute Data in a Geo-Referenced Database ID AREA PERIM CLASS LANDUSE Single Family Multi Family Commercial Forest Water ARC INFO

Introduction to ArcGIS ArcGIS is a software program, used to create, display and analyze geospatial data, developed by Environmental Systems Research Institute (ESRI) of Redlands, California.Environmental Systems Research Institute

ESRI’s ArcGIS Platform Suite of Three Integrated Applications: ArcCatalog ArcMap ArcToolbox

Components of ArcGIS ArcCatalog is used for browsing for maps and spatial data and managing spatial data, viewing and creating metadata. ArcMap is used for visualizing spatial data, performing spatial analysis and creating maps to show the results. ArcToolbox is an interface for accessing the data conversion and analysis function that come with ArcGIS.