19 july 2000 iai summer institute gis: definition,...
TRANSCRIPT
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GIS: Definition, Software
IAI Summer Institute
19 July 2000
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What is a GIS?
¥ Geographic Information System
¥ Definitions—DeMers (1997): Tools that allow for the
processing of spatial data into information,generally information tied explicitly to, andused to make decisions about, some portion ofthe Earth.
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GIS - Geographic InformationSystems
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Some GIS Examples
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Some GIS Examples
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Some GIS Examples
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Definitions Continued
¥ Star and Estes 1990: An information systemthat is designed to work with datareferenced by spatial or geographiccoordinates; both a database system withspecific capabilities for spatially-referenceddata, as well as a set of operations forworking with the data. A higher-order map.
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Definitions Continued
¥ Clarke (1997), referring to Burrough(1986): A powerful set of tools for storingand retrieving at will, transforming anddisplaying spatial data from the real worldfor a particular set of purposes.
¥ Clarke (1997) again: Automated systems forthe capture, storage, retrieval, analysis anddisplay of spatial data.
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Definitions Continued
¥ Ron Abler (1988): GIS are simultaneouslythe telescope, the microscope, the computer,and the Xerox machine of regional analysisand synthesis of spatial data.
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GIS According to ESRI
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Kinds of GIS Data Representation
¥ Vector—Point—Line (Arc)—Area (Polygon)—Points, Lines, and Areas in
Space
¥ Raster—Grid—Hexagons, others—Quasi-Continuous Surface
in Space
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Vector Data Model
Æ(X,Y)
Æ
Æ
(X1,Y1)
(X2,Y2)
(X3,Y3)
(X4,Y4)(X5,Y5)
(X6,Y6)
(X7,Y7)(X8,Y8)
(X9,Y9)
(X10,Y10)(X1,Y1)
(X2,Y2)
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Spatial Elements in aVector World
¥ Point¥ Line¥ Area (Polygon)¥ Surfaces
Source: DeMers 1997
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Vector Data Structure
Source: http://www.utexas.edu/depts/grg/gcraft/notes/datacon/datacon.html#Vector
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Vector Data ModelPoints
Lines
Areas or Polygons
Model - Simplified representationof the patterns or processes of asystem. In this case, the Earth sSurface (not Clarke s definition).
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Vector Data Model
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Raster Data Model
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Raster Data Model
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11
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11
11 11
9 9 9
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3
3
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Raster Data Structure
Source: http://www.utexas.edu/depts/grg/gcraft/notes/datacon/datacon.html#Raster
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Raster Data Structure
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Raster Representation of Point,Line, Area
Source: DeMers
Also:MinimumMappingUnit (MMU)
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Raster Data Structure
Source: Clarke, K.C. 1999. Getting Started with GIS. Prentice-Hall.
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Vector Data Structure
Any better?
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Raster vs. Vector¥ RASTER
—Simple Data Structure—Rows/Columns of
Equal-Size Grid Cells,Each of Which HasReal X,Y Coordinates
—Resolution Depends onCell Size
—Each Cell has SingleAttribute (may link toseparate attribute table)
¥ VECTOR—Points, Lines, Polygons
with TopologicalRelationships andReal X,YCoordinates for AllFeatures
—Resolution Depends onSource Data
—Objects may have aNumber of Attributes
—Each Feature hasUnique IdentifierLinking it toDescriptive Attributes
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Organizing Data andInformation
¥ Information can be organized as lists,numbers, tables, text, pictures, maps, orindexes.
¥ Clusters of information called data can bestored together as a database.
¥ A database is stored in a computer as files.
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SHOESBaltimore Orioles39o20 N 76o38 WNew York Yankees40o40 N 73o58 W
Figure 2.1 The Elements of a GIS. (1) The Database (shoebox); (2) The Records (Baseball Cards); (3) TheAttributes (The categories on the cards, such as a batting average; (4) The geographic information (loca-tions of the team s stadium in latitude and longitude); (5) A means to use the information (the computer).Source: Clarke 1999
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The GIS Database
¥ In a database, we store attributes as columnheaders and records as rows.
¥ The content of an attribute for one record isa value.
¥ A value can be numerical or text.
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Flat File Database
Record Value Value Value
Attribute Attribute Attribute
Record Value Value Value
Record Value Value Value
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The GIS Database (ctd)
¥ Data in a GIS must contain a geographicreference to a map, such as latitude andlongitude.
¥ The GIS cross-references the attribute datawith the map data, allowing searches basedon either or both.
¥ The cross-reference is a link.
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Relational Database Terms
¥ Entities = in GIS, points, lines, areas, surfaces (Vector),Grid Cell (Raster).
¥ Attributes = Information about the Entities¥ Tuples = Ordered records of rows of attribute values.
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Why Relational?
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Geographical Representation ofEntities and Attributes
¥ A jump from databases to geographicrepresentation - difficulties?
¥ Several other attributes come into play:—Location—Connections—Angles and distances—Neighbors—Topology
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Sources of GIS Data
¥ See Pointer MWB Web Site—http://www.clas.ufl.edu/users/mbinford/geo317
1/Pointers_to_WWW_GIS_Resources.html
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What can we do with GIS: CaseStudy
¥ Camp Pendleton Case Study
¥ Go tohttp://www.gsd.harvard.edu/brc/brc.html
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Camp Pendleton, CA Context Region
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Region of Camp Pendleton
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Land Cover 1990+
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Plans Build-Out
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Comparison 1990+ and Plans Build-Out
Land Cover 1990+
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Various Data
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Various Analyses
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Final Results - Conservation Priority
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The Software: Idrisi
¥ Run Idrisi¥ Environment¥ File Structure
—Raster and Raster Documentation Files
ArcView¥ Run ArcView
—Add Extensions
¥ File Structure—Feature, Image, and Grid Files
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Idrisi
http://www.idrisi.clarku.edu/
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IDRISI System Basics
¥ WINDOWS SCREEN - run IDRISI
¥ Menu System
¥ Tool Bar
¥ Status Bar
¥ Program Modules
¥ Setting the Working Directory
¥ Working with IDRISI dialog boxes
¥ Pick Lists
¥ Automatic Output File Names
¥ Overwrite Protection
¥ HELP FILES!!!!!!
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IDRISI System Basics
¥ MAP LAYERS (Displayed)— Image Layers - .rst and .rdc files
— Vector Layers - .vct and .vdc files
¥ MAP LAYER FILE STRUCTURES— Image Files
¥ Integer Files (+/- 32767 16-bit integers)
¥ Byte Files (0 - 255 8-bit integers)
¥ Real Number Files (+/- 1 x 1018 7 significant digits)
¥ CONVERT
127 156 144 5
127 5 5 127127 5 127 127
5 5 127 127
115 134 117 115
127156144
134117114
Actuallystored as:
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Idrisi System Basics
¥ Other File Types (not displayed)—Attribute Values Files and Documentation Files
—Symbol and Palette Files
—Reference System Parameter Files
—Group Files
—Map Composition Files
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Idrisi System Basics
¥ Displaying Maps and Map Layers—Display launcher
—Map Window
—Composer
—Printer Workshop
—Symbol Workshop
—Palette Workshop
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ArcView
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ArcView
Windows: Project, View, Table, Layout
Selections: Map, Table
Legend Editor
Query, Measurement, Analyses