vaduz'library'oregonstate'edu:9090metadataexplorer_findexplorer'jsp

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vaduz.library.oregonstate.edu9090/metadataexplore
r_find/explorer.jsp

• If interested in job contacttim.fiez_at_oregonstate.
  edu
• NEXT week

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Models and the Structures of ArcGIS

• Longley et al., ch. 5
• Zeiler, chs. 1 and 6

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Models for GIS

• representation of reality --gt model
• GIS itself is based on a model of complexity
• GIS is used to model complexity
• full representation of reality?

• data model limited representation of reality
• a discretization or partitioning of space
• finite, discrete nature of computing devices

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Data Model

• representation of information about the process
• grid or layer (field)
• isoline (object)
• Delauney triangulation (alternative)
• geo-relational (field or object)

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3 Data Models

• geo-relational coverage (field view from classic
  ArcInfo polys)
• geo-relational shapefile (discrete object view
  from ArcView)
• geodatabase (object-oriented new in ArcGIS 8)

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Georelational Data ModelClassic ArcInfo and
ArcView
Arc
Info
command line interface Unix, NT, Win2K ArcView as
interface
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ArcInfo Coverage as a Data Structure
Image courtesy of Louisville/Jefferson County
Information Consortium, Kentucky
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Data Structure

• not tied to process at all
• concerned simply with what can be computed and
  what cant
• the way in which the data model is represented in
  the GIS
• DEM for grid or layer model
• contour for isoline model
• TIN for Delauney triangulation model
• coverages, shapefiles for geo-relational
• geodatabase for OO geodatabase

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Data Structures

• ArcInfo coverages
• ArcView shapefiles
• ArcInfo grids, USGS DEMs
• Images (e.g., georeferenced tiffs)
• TINs
• Geodatabases

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Geodatabase

• Features and attributes as objects
• Relationships among features
• Validation or editing rules, behaviors
• Container for
• Vector, raster, tabular data
• Relationships
• topology

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Relationships for a feature
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Personal and MultiUser Gdbs
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ArcGIS 8 Icons( Zeiler, pp. 65-71 )
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ArcGIS 8

• ArcToolbox (old Arc) - analysis engine
• substantial geoprocessing tools
• analysis, mostly for coverages
• ArcCatalog (old Info) - data mgmt. engine
• data preview
• managing data
• Metadata, Internet access
• ArcMap (old ArcPlot) - map engine
• display and map production
• the next version of ArcView, i.e., ArcView 8.1
• ArcEditor (old ArcEdit) - map editing

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ArcGIS 8

• Classic ArcInfo on the command line
• ArcInfo Workstation

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Integration of Modules

• ArcMap, ArcCatalog, ArcTools
• e.g., ArcCatalog to ArcMap, drag and drop
• ArcGIS
• three main modules AI Workstation, as well as
• ArcSDE
• ArcIMS
• Other extensions (spatial, geostatistical, 3D,
  ArcPress, etc.)
• Individual (desktop) or multiuser (enterprise)

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Integrated Web Access

• transparent integration with ArcIMS servers
• the Geography Network
• www.geographynetwork.com

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Lambert
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Extensions

• GRID module for raster analysis and modeling
  (e.g., Spatial Analyst)
• Surface module - TINs
• Networks
• Geostatistics

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Extensions ( cont. )support.esri.com

• ArcSDE (1993)
• large spatial database applications
• adding spatial functions to databases
• find all customers named Smith
• find all customers named Smith within 1/4 mile
  of x
• Oracle, Informix, Microsoft SQL Server, IBM
  Universal Database
• ArcIMS
• spatial support for web servers
• Intergraph, MapInfo, Smallworld

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Horizontal vs. Vertical Markets

• ArcInfo - one size fits all
• ESRI does not lead in diversification
• ArcView, ArcExplorer
• ArcLogistics, Maplex, Business Analyst, ArcFM
• Smallworld, Intergraph, MapInfo, Erdas, etc.
• Vertical markets, application domains
• see Zeiler pages 48-50
• Applications with their own core data elements

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ArcGIS Data Modelssupport.esri.com/datamodels.cfm
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ArcGIS Marine Modeldusk.geo.orst.edu/djl/arcgis