Something basic about GIS What is GIS n

Something basic about GIS

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

A Definition of GIS n n GIS = Geographic Information Systems Worboys, 1995: n 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 n n n Collection Storage & Management Retrieval Conversion Analysis Display

Applications of GIS n How GIS can be used: n n n n 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 Administrative Boundaries Utilities Zoning Buildings Parcels Hydrography Streets Digital Orthophoto n Data Organized by Layers/Themes

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

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

GIS Associates Spatial and Attribute Data in a Geo-Referenced Database ARC 1 5 2 4 INFO 3 ID 1 2 3 4 5 AREA 260210 18210 260210 258876 3008 PERIM CLASS LANDUSE 20688 100 Single Family 20688 100 Multi Family 20688 100 Commercial 16880 200 Forest 88 500 Water

Introduction to Arc. GIS n n Arc. GIS is a software program , used to create, display and analyze geospatial data , developed by Environmental Systems Research Institute (ESRI) of Redlands, California. http: //www. esri. com/

ESRI’s Arc. GIS Platform n Suite of Three Integrated Applications: n Arc. Catalog n Arc. Map n Arc. Toolbox

Components of Arc. GIS n n n Arc. Catalog is used for browsing for maps and spatial data and managing spatial data, viewing and creating metadata. Arc. Map is used for visualizing spatial data, performing spatial analysis and creating maps to show the results. Arc. Toolbox is an interface for accessing the data conversion and analysis function that come with Arc. GIS.