ch03 - Chapter 3: Getting Information from a GIS Learning...

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Chapter 3: Getting Information from a GIS Learning and Using Geographic Information Systems: ArcExplorer Edition
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Learning and Using Geographic Information Systems: ArcExplorer Edition 2 Objectives Get an introduction to vector and raster map file formats Learn how data records are attached to map graphics in feature attribute tables Understand database attribute queries that select map features Understand spatial queries that select map features by location View feature attribute tables and data in ArcExplorer
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Learning and Using Geographic Information Systems: ArcExplorer Edition 3 Objectives (continued) Make feature attribute queries in ArcExplorer Carry out direct and buffered spatial queries in ArcExplorer
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Learning and Using Geographic Information Systems: ArcExplorer Edition 4 Map Formats GIS uses two types of map layers Vector features Points, lines, polygons Raster Rectangular array of pixels
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Learning and Using Geographic Information Systems: ArcExplorer Edition 5 Vector-Based Maps Graphical features with attribute tables Vector file formats ArcView Shapefile: simple and widely-used format ArcInfo Coverage: obsolete format that has a folder for each map layer and about 12 or more files ArcInfo E00 export format: Single file that includes all of the data files of a coverage for easy export and interchange of map files Need a utility program to transform E00 export files into a coverage before you can use them in a GIS
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Learning and Using Geographic Information Systems: ArcExplorer Edition 6 Vector-Based Maps (continued) Event theme Data table that includes map coordinates, such as latitude and longitude or projected coordinates
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Learning and Using Geographic Information Systems: ArcExplorer Edition 7 Vector-Based Maps (continued) Feature attribute table data types Text (or String) data such as names, addresses, and so on Date: dates such as 12/31/2007 Integer: numbers without decimal places such as 100 or 213 Decimal (or Real): numbers with decimal places such as 3.141592 Boolean: one of two values, such as true or false and 1 or 0
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ArcExplorer Edition 8 Raster Maps Digital images that have map coordinates and a rectangular array of pixels Color depth - maximum size number that can be stored in each grid cell
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This note was uploaded on 07/11/2011 for the course MIS 658 taught by Professor Dr.d during the Spring '11 term at Our Lady of Holy Cross College.

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ch03 - Chapter 3: Getting Information from a GIS Learning...

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