u.s. department of the interior u.s. geological survey the development of a national hydrography...
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U.S. Department of the InteriorU.S. Geological Survey
The Development of a National Hydrography Dataset for Semantic Geospatial Science Integration Dalia E. Varanka
http://cegis.usgs.gov/ontology.html
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National Hydrography Dataset (NHD)
Surface Water Drainage Network of the U.S. Charts water data and models flow One of four vector layers of The National Map Esri ArcGIS file formats
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Objectives
National Hydrography Dataset (NHD) Database ontology: develop for many purposes
Science data integration Observations & Measurements ontology Coastal and Marine Ecology Classification
Standard Basic Formal Ontology
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Surface Water Ontology Module
Upper Level Ontology
All USGS Topographic Categories
Specialist Domain
NHD Esri Database
Surface Water
Coherent with
Coherent with
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NHD Feature Semantics
Converted triples are NHD segments with a URI using the unique id, and defined feature types, geometry, and other attributes.
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NHD Semantics from Users Guide
Object
Space
Event
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NHD/Science Data Integration
Upper Level Ontology
All USGS Topographic Category Ontology
Specialist Domain Data
NHD Esri Data
Surface Water
Links inferred by
Links inferred by
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Fish Habitat Data Integration
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Observation & Measurement (O&M) Ontology
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Spatial Science Semantics
Spatial Scale and other Relations
Particular Variables
Specific Populations
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Coastal and Marine Ecology Classification Standard (CMECS)
FGDC standard; written to be spatially explicit for mapping and geospatial information application
Expressed in GIS (NOAA)
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Categorical Spatial Relations
Subsystem: Lacustrine Littoral – The Littoral Subsystem includes shallow habitats in the Lacustrine System. The shoreward boundary of this subsystem extends to the landward limit of non-persistent emergents. The lakeward boundary includes all waters to a depth of 2 meters below Mean Lower Low Water (MLLW), or to the maximum extent of non-persistent emergents, whichever depth is greater.
Subsystem: Lacustrine Limnetic – The Limnetic Subsystem includes all deepwater habitats within the Lacustrine System. “Deepwater habitats” are those that occur at depths greater than 2 meters below MLLW—unless there are non-persistent emergents in those areas. In which case, “deepwater habits” are those beyond the limit of occurrence of non-persistent emergents.
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Categorical Spatial Relations
Spatial relation properties (verb/preposition pairs) extracted from topo feature definitions
FLOW
Subject Predicate Object
Water flowTHROUGH Channel (Linear deep part of a body of water)
Underground water flowTO The surface of the EarthCAUSED Crater (Circular-shaped depression at the summit of a volcanic cone or one on the surface of the land)
causedBY the impact of a meteorite
Crater (a manmade depression) an explosion (caldera, lua)FORM Crossing (A place where two or more routes of transportation)
form a junction or intersection (overpass, underpass)
REMOVED Mine (place where commercial minerals) removedFROM Earth
Oilfield (area where petroleum is/was) Earth
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Important because…
The spatial element of a class definition sets criteria for membership of individuals and for inferred semantics
Must be consistent through inference; these categories may possibly serve as superclasses for data integration
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Asserted Spatial Properties
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Graph Pattern as a Rule
CONSTRUCT ?SB rdf:type :ShorewardBoundary Category Name
WHERE ?SB
:LandwardLimit geo:Contains :NonPersistentEmergents
:LandwardLimit geo:Equals :ShorewardBoundary
Category Criteria
Construct triples to comply with a graph pattern using: Category names as subject or object, GeoSPARQL properties Variables
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Surface Water / Upper Level Semantic Integration
Upper Level Ontology
All USGS Topographic Category Ontology
Science Domain Ontology
NHD Esri Database Ontology
Surface Water
Links inferred by
Links inferred by
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Our Interest in Basic Formal Ontology (BFO)
Ontology modeling best practices Strong general environment/science
specification approach Recognition of the role of geographic
features and space Approaches to processes and change
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Entity
Continuant Occurant
Independent Continuant
Dependent Continuant
Material Entity Immaterial Entity
Site Boundary Spatial RegionObject Fiat Object Part
Object Aggregate
HillMountain Range
Mount Footprint Area
Footprint PerimeterFootprint Area
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Entity
Continuant Occurant
Independent Continuant
Dependent Continuant
Quality Realizable Entity
Reserve National Park
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Entity
Continuant Occurant
Process
Process Boundary Temporal Region
Spatiotemporal Region
Disturbance
Disturbance Extent
Period of Disturbance
Disturbed
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U.S. Department of the InteriorU.S. Geological Survey
Thank you
Northern Flicker