GIS week 2/ Ch. 1,2,3
GIS week 2/ Ch. 1,2,3 GEOL4330
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This 3 page Class Notes was uploaded by Taytum Guzman on Saturday September 17, 2016. The Class Notes belongs to GEOL4330 at University of Texas at Arlington taught by Dr. Lee in Fall 2016. Since its upload, it has received 23 views. For similar materials see Geographic Information Systems in Science at University of Texas at Arlington.
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Date Created: 09/17/16
Geographic Information Systems Week 2 notes (first week of material) Chapter 1: What is GIS? GIS is a computer-based system to aid in the collection, maintenance, storage, analysis, output, and distribution of spatial data and information (Bolstad, 2005) An information system which stores, analyses, and displays both spatial and non-spatial data (Parker, 1988) A system of hardware, software, data, people, organizations and institutional arrangements for collecting, storing, analyzing and disseminating information about areas of the earth. (Dueker and Kjerne 1989, pp7-8) Basic GIS principles Layers – geographic objects that are alike and defined by a visual symbol. Features – geographic objects within a layer. Shape and size (vector) Point cities, schools, fire hyobjects too small to be a polygon line rivers, roads, pipelines polygon countries, lakes, tracts of land Surfaces elevation, slope, temperature, rainfall, wind speed natural phenomena without shape Numeric value (raster) Cell: represents a unit of surface area and contains a value for that location Graticule: a grid on the map often acting as coordinate system Vector data model: “a representation of the world using points, lines and polygons. Vector models are useful for storing data that has discrete boundaries, such as country borders, land parcels, and streets.” (ESRI, GIS dictionary) Raster data model: “A representation of the world as a surface divided into a regular grid of cells. Raster models are useful for storing data that varies continuously, as in an aerial photograph, a satellite image, a surface of chemical concentrations, or an elevation surface.” (ESRI, GIS dictionary) Chapter 2: Introducing ArcGIS ArcMap: maps and analyzing data ArcCatalog data management ArcToolbox within one of the two above; includes geoprocessing tools, models, and scripts. Arcscene 3D visual simulation ArcGlobe 3D visual simulation Tiles: organized images containing data of raster and vector features Cache: to save to the system memory for quick display and navigation Cloud computing: allows use to a cloud provider’s computing infrastructure instead of your own. Chapter 3: interacting with maps ArcMap Map display Table of contents Toolbars
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