Duplicate Entries in Gazetteers jordan Hastings Department of
- Slides: 26
“Duplicate” Entries in Gazetteers jordan Hastings Department of Geography University of California Santa Barbara
Gazetteer “Duplicates” Names & Features (1) n Naming Features in the Environment n n Linguistic Necessity Identity and Ownership Navigation and Wayfinding Features Cover a Large Territory n n n Crisp or Diffuse Compact or Extended Tangible or Abstract
Gazetteer “Duplicates” Names & Features (2) n Locations are Numerous & Various n n Multiscale Generalized Dis-coordinated Time-variant
Gazetteer “Duplicates” Names & Features (3) n Names are Numerous & Various n n Polynymous Mis-spelled Multilingual Time-variant
Gazetteer “Duplicates” Names & Features (4) Lake Bigler, thru 1920 s Lake Bonpland (also Bondland), thru 1890 s Da-ow-a-ga, thru 1850 s
Gazetteer “Duplicates” Feature Types (1) n Dependable Type System n n n Because Features are “Objects” Because Human Mind Categorizes Types present in Taxonomy n n Hierarchy is Natural in Environment Because Human Mind Categorizes
Gazetteer “Duplicates” Feature Types (2) – Examples Cultural Environment n Nations -> States -> Provinces -> Districts
Gazetteer “Duplicates” Feature Types (2) - Examples n Physical Environment n Watersources: Springs-->Seeps n Watercourses: Rivers-->Streams-->Creeks n Waterbodies: Lakes-->Ponds-->Sloughs ? Glaciers
Gazetteer “Duplicates” Fundaments (1) n n Definition: Gazetteer A spatial dictionary of named & typed features in the environment Implications n n n Features uniquely identified Searchable by name and type Also searchable geospatially
Gazetteer “Duplicates” Fundaments (2) n Duplicates: An approximate notion n n Firm types, ±close in hierarchy Locations ±close dependent on scale Names ±close dependent on language … or not at all All aspects variant in time
Gazetteer “Duplicates” Fundaments (3) n Database Implications / Support n Custom Datatypes n n n Multiple Attribution (unlimited) n n n Hierarchy Geometry Names Locations Efficient Geospatial Processing
Gazetteer “Duplicates” Approach (1) n Independent Measures of Duplicates n 1. Type Thesaurus Metrics n n 2. Geospatial Metrics n n n Inter-feature: hierarchy, explicit linkages Intra-feature: size, compactness, … Inter-feature: distance, overlap, … 3. Geonomial Metrics n n Intra-feature: NL translation [not considered yet] Intra-feature: stemming, soundex, substitution
Gazetteer “Duplicates” Approach (2) n Unified Assessment of Duplicates n Weighted Combination of Measures n n n 1 Type 2 Location(s) 3 Name(s) Geographic Visualization, over Maps Final Authority of Human Cataloger
Gazetteer “Duplicates” Processing Cycle random features prep grouped features rework
Gazetteer “Duplicates” Processing Cycle random features prep grouped features rework
Gazetteer “Duplicates” Processing Cycle random features prep grouped features weigh accepted suspended feature database
Gazetteer “Duplicates” Processing Cycle random features prep grouped features weigh accepted review feature database suspended
Gazetteer “Duplicates” Processing Cycle random features prep grouped features weigh review accepted post feature rework suspended reject database trash
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