7.3.3 GeologicUnitView features
GeologicUnitView features represent outcrops of a particular geologic unit, typically with polygon geometry. The properties of these features provide a simplified view of information associated with GeoSciML GeologicUnit features. A geologic unit in this context is an identifiable body of material within the Earth. GeologicUnitView features are instances of GeoSciML MappedFeature with property values from the associated GeologicUnit specifier summarized in text fields for human data consumers, and with fields containing standard identifiers for geologic unit type, representative lithology, and geologic age. The specification_uri property identifies a description resource specific to the geologic unit cropping out in the extent of the polygon (or other) geometry of the feature. The specification_uri should dereference to yield a formally-encoded representation of the geologic unit, ideally in GeoSciML for interoperability. Properties populated by identifiers are suffixed with ‘_uri’ and contain URIs referring to other resources, for example controlled concepts in published vocabularies.
Elements in GeologicUnitView feature class
Missing values should be specified using OGC nil values (see section 7.3.1 for allowed values) alternatively you could use INSPIRE defined void reaons http://inspire.ec.europa.eu/codelist/VoidReasonValue/
Bold property names indicate required properties.
Whilst properties of type _uri are defined as xs:string in the GeoSciML-Portrayal 4.0 schema, to be conformant with GML SF-0, the intention is that these strings SHALL BE absolute URI’s.
| Name | Type | Notes |
|---|---|---|
| identifier | xs:string | Globally unique identifier for the individual feature. Recommended practice is that this identifier be derived from the primary key for the spatial objects in the source data in case information needs to be transferred from the interchange format back to the source database. This identifier is analogous to the identifier for a GeoSciML MappedFeature. |
| name | xs:string | Display name for the GeologicUnit; this can be used to put in a geologic unit name, or more likely an abbreviation used to label outcrops of the unit in a map display. |
| description | xs:string | Text description of the GeologicUnit, typically taken from an entry on a geological map legend. |
| geologicUnitType | xs:string | Type of GeologicUnit (as defined in GeoSciML). |
| rank | xs:string | Stratigraphic rank of GeologicUnit (as defined in GeoSciML). Examples: formation, member, group, supergroup. |
| lithology | xs:string | Text (possibly formatted with formal syntax) description of the GeologicUnit’s lithology. |
| geologicHistory | xs:string | Text (possibly formatted with formal syntax) description of the age of the GeologicUnit (where age is a sequence of events and may include process and environment information). |
| numericOlderAge | xs:double | Older age in numerical representation in Ma. |
| numericYoungerAge | xs:double | Younger age in numerical representation in Ma. |
| observationMethod | xs:string | ObservationMethod is a convenience property to provide observation metadata. Example values might include ‘field observation by author’, ‘compilation from published maps’, ‘air photo interpretation’. Recommend using the CGI Feature Observation Method vocabulary (http://resource.geosciml.org/classifier/cgi/featureobservationmethod/) |
| positionalAccuracy | xs:string | Preferred use is a quantitative value defining the radius of an uncertainty buffer around a MappedFeature, e.g. a positionAccuracy of 100 m for a line feature defines a buffer polygon of total width 200 m centered on the line. Some other text description that quantifies position accuracy may be provided, e.g. a term from a controlled vocabulary. Vocabulary used should be described in the dataset metadata. For polygon mapped features this is intended for use to indicate the position uncertainty of the contact and fault features bounding the outcrop polygon, which is only necessary if the associated line features are not included with the polygons. |
| source | xs:string | Text describing feature specific details and citations to source materials, and if available providing URLs to reference material and publications describing the geologic feature. This could be a short text synopsis of key information that would also be in the metadata record referenced by metadata_uri. |
| geologicUnitType_uri | xs:string | URI referring to a controlled concept from a vocabulary defining the GeologicUnit types. Mandatory property - if no value is provided then a URI referring to a controlled concept explaining why the value is nil must be provided. |
| The current CGI controlled vocabulary is: http://resource.geosciml.org/classifier/cgi/geologicunittype/ | ||
| The current INSPIRE specific controlled vocabulary is: http://inspire.ec.europa.eu/codelist/GeologicUnitTypeValue/ | ||
| representativeLithology_uri | xs:string | URI referring to a controlled concept specifying the characteristic or representative lithology of the unit. This may be a concept that defines the supertype of all lithology values present within a GeologicUnit or a concept defining the lithology of the dominant CompositionPart (as defined in GeoSciML) of the unit. This identifier is intended for use as the symbol key for a lithologic map portrayal of the geologic unit features. |
| The current CGI controlled vocabulary is: http://resource.geosciml.org/classifier/cgi/lithology/ | ||
| The current INSPIRE specific controlled vocabulary is: http://inspire.ec.europa.eu/codelist/LithologyValue/ | ||
| representativeAge_uri | xs:string | URI referring to a controlled concept specifying the most representative stratigraphic age interval for the GeologicUnit. This will be defined entirely at the discretion of the data provider and may be a single event selected from the geologic feature’s geological history or a value summarizing all or part of the feature’s history. This identifier is intended for use as a symbol key for a geologic-age-based portrayal of the geologic unit features. |
| representativeOlderAge_uri | xs:string | URI referring to a controlled concept specifying the most representative older value in a range of stratigraphic age intervals for the GeologicUnit. This will be defined entirely at the discretion of the data provider and may be a single event selected from the geologic feature’s geological history or a value summarizing all or part of the feature’s history. |
| representativeYoungerAge_uri | xs:string | URI referring to a controlled concept specifying the most representative younger value in a range of stratigraphic age intervals for the GeologicUnit. This will be defined entirely at the discretion of the data provider and may be a single event selected from the geologic feature’s geological history or a value summarizing all or part of the feature’s history. |
| Current CGI controlled vocabulary are: http://resource.geosciml.org/classifier/ics/ischart/ and http://resource.geosciml.org/classifier/cgi/stratchart/ (for OneGeology-Europe Precambrian Epoch definitions for the Fenno-Scandian Shield) | ||
| The current INSPIRE specific controlled vocabulary is: http://inspire.ec.europa.eu/codelist/GeochronologicEraValue/ | ||
| specification_uri | xs:string | URI for a complete description of the geologic unit cropping out within the extent of the feature’s geometry. Preferred representation is a GeoSciML GeologicUnit feature instance. Mandatory property - if no value is provided then a nil reason URI explaining why the value is nil must be provided. |
| metadata_uri | xs:string | URI referring to a metadata record describing the provenance of data. |
| genericSymbolizer | xs:string | Identifier for a symbol from standard (locally or community defined) symbolization scheme for portrayal. |
| shape | GM_Object (GM_polygon) | Geometry defining the extent of the feature of interest. |
| Other attribute(s) | A placeholder allowing any user-defined attributes to be delivered in addition to those specified above. | |
Section last modified: 9 December 2015