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GEOG 379

by: Malik Moulton
Malik Moulton

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About this Document

fundamental cartography and geographic information systems
Intro to GIS Systems
Md Shakil B. Kashem
Class Notes
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Popular in Intro to GIS Systems

Popular in Geography

This 2 page Class Notes was uploaded by Malik Moulton on Thursday January 28, 2016. The Class Notes belongs to GEOG 379 at University of Illinois at Urbana-Champaign taught by Md Shakil B. Kashem in Spring 2016. Since its upload, it has received 58 views. For similar materials see Intro to GIS Systems in Geography at University of Illinois at Urbana-Champaign.


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Date Created: 01/28/16
Desktop GIS  ArcGIS: developed by ESRI, free for UofI students  QGIS: Free and open source  Map Window: Free and open source  GRASSGIS: Free and open source – developed by the U.S. Army Corps of Engineers  ILWISGIS: Free and open source  Auto desk, MapInfo, ENVI...and many more Data in GIS -All GIS data types contain two distinct elements  Spatial Data  Attribute Data Spatial Data Models -All GIS data has two types: Vector and Raster Vector (feature) -Basic unit: (x,y,z coordinates -each point a theoretical spot on earth -other vector types derived from this basis -good for discrete and clearly demarked points like nation boundaries Raster (grid) -basic unit: the grid cell -each cell represents an area -all cells within one raster dataset are the same size -good for continuous values such as elevation and vegetation *IMAGES IN ARCGIS ARE RASTERS Raster Data: Structure -raster data models entrie surfaces -basic building blocks are cells - depending on context, data might be called names such as:  Grid  Raster  Digital elevation Model (DEM)  Aerial photography In Class Quiz #1 1. What can be the reason for a red exclamation point on a map layer/ -Missing link to data 2. True/False The basic unit for a vector map is called a point? -True History of GIS -Dr. John Snow  For his persistent efforts to determine how cholera was spread and for the statistical mapping methods he initiated, John Snow is widely considered to be the father of [modern] epidemiology. - London cholera epidemic 1854


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