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Published byOliver Lyons Modified over 8 years ago
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“Models” Another word that is really over used: –Model builder: Really process flows –Modeling: Creating mathematical and logical models of real-world phenomenon –Data Model: Simple “typed” data –A data set (i.e. a shapefile, a TIFF file) “Data Model” –Multiple simple models for the same arae
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Model “A schematic description of a system, theory, or phenomenon that accounts for its known or inferred properties and may be used for further study of its characteristics” –American Heritage® Dictionary of the English Language An abstraction of something real. –Dr. Thomas Hobbs
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Raster “Models” Topography: Elevation/depth, slope, aspect, contours Distance to water Pop. Density Temperature Precipitation Habitat
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Vector “Models” Roads Streams Population of states Census.gov
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Types of “Models” Binary/Boolean Models: –Only 0 or 1 –Masks Ranking Models: –Ordinal ranking of areas Continuous Models –Possible values are continuous over some range –Index Models: from 0 to 1 –DEMs –Etc.
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Classification into Rankings Depth Classes Depth (Bathymetry) 164 to -3706 meters
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Index Model Scale inputs from 0 to 1 Multiply together Can be weighted based on importance
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Data Structure Defines the “structure” of the data A container for specific types of data Can contain data of different meanings For files, synonymous with “Format” Examples: –Shapefile: Point, Polyline, Polygon –TIFF: Raster –Text file: Tables –XML: Metadata
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Data Model Defines the contents and meaning of the data Should be detailed enough for someone else to use the data Examples: –Tiger Census files –NHD watersheds –Landsat Image –GNIS Data –FGDC Metadata
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Data Modeling
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Esri Approach
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Esri Data Models Administrative Boundaries Agriculture Basemap Biodiversity/Conservation Cadastre 2014 Defense/Intel Energy Utilities Environmental Regulated Facilities Historic Preservation Hydrographic/Navigation (IHO) Local Government Marine Petroleum Pipeline System Architecture Telecommunications Transportation Water Utilities Water Resources (Hydro, Groundwater) Forestry Geology Land Parcels
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Graphic courtesy of Maidment et al., ArcHydro team
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Arc Marine dusk.geo.orst.edu/djl/arcgis
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Geodatabase Feature Class Geometries
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References Arctur, D. and Zeiler, M., 2004, Designing Geodatabases, ESRI Press Lowe, J.W., 2003. Flexible data models strut the runway. Geospatial Solutions, 13(2): 44-47. Maidment, D.R., 2002. Arc Hydro: GIS for Water Resources, ESRI Press, 203 pp. w/CD. Li, X. and M.E. Hodgson, 2004. Vector-field data model and operations. GISci. Rem. Sens., 41(1): 1-24. Wright, D., Blongewicz, M., Halpin, P., and Breman, J., Arc Marine: GIS for a Blue Planet, Redlands: ESRI Press, 2007. In Digital Earth or dusk.geo.orst.edu/djl/arcgis/book.html
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