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Overview

The Linked Earth specification is divided in several documents to facilitate its navigation.

• The Linked Earth Core Ontology provides the main concepts and relationships to describe a paleoclimate dataset and its values.
• The Archive Type Ontology describes a taxonomy of the most common types of archives.
• The Paleo Variables Ontology describes a taxonomy of the most common types of paleo variables.
• The Paleo Proxy Ontology describes a taxonomy of the most common types of paleo proxies.
• The Paleo Units Ontology describes a taxonomy of the most common types of paleo units.
• The Interpretation Ontology describes a taxonomy of the most common interpretations.
• The Instrument Ontology describes a taxonomy of the most common instrument for taking measurements.
• The Chron Variables Ontology describes a taxonomy of the most common types of chron variables.
• The Chron Proxy Ontology describes a taxonomy of the most common types of chron proxies.
• The Chron Units Ontology describes a taxonomy of the most common types of chron units.

Older ontologies (unused)

• The Proxy Observation Ontology describes a taxonomy of the most common types of observed properties (e-g-, temperature, moisture, thickness, etc.
• The Proxy Sensor Ontology describes a taxonomy of the most common types of sensors.
• The Inferred Variable Ontology describes a taxonomy of the most common types of inferred variables that can be found in a dataset.

Accessing the Linked Earth Ontology

The following table contains the pointers to the Linked Earth ontologies:

Ontology	Serialization	Version	License	Language	Description
The Linked Earth Core Ontology	TURTLE	2.0.0	BY/2.0	en	The Linked Earth Core Ontology aims to provide a common vocabulary for annotating paleoclimatology data
The Archive Type Ontology	TURTLE	2.0.0	BY/2.0	en	The Archive Type Ontology defines different types of archive types that we can find in a paleo climate dataset.
The Paleo Variables Ontology	TURTLE	2.0.0	BY/2.0	en	The Paleo Variables Ontology defines different types of paleo variables that we can find in a paleo climate dataset.
The Paleo Units Ontology	TURTLE	2.0.0	BY/2.0	en	The Paleo Units Ontology defines different types of paleo units that we can find in a paleo climate dataset.
The Paleo Proxy Ontology	TURTLE	2.0.0	BY/2.0	en	The Paleo Proxy Ontology defines different types of paleo proxies that we can find in a paleo climate dataset.
The Interpretation Ontology	TURTLE	2.0.0	BY/2.0	en	The Interpretation Ontology defines the different types of interpretation variables that we find in a paleo climate dataset.
The Instrument Ontology	TURTLE	2.0.0	BY/2.0	en	The Instrument Ontology defines the different types of instruments that can be used to measure in a paleo climate dataset.
The Chron Variables Ontology	TURTLE	2.0.0	BY/2.0	en	The Chron Variables Ontology defines different types of chron variables that we can find in a chron climate dataset.
The Chron Units Ontology	TURTLE	2.0.0	BY/2.0	en	The Chron Units Ontology defines different types of chron units that we can find in a chron climate dataset.
The Chron Proxy Ontology	TURTLE	2.0.0	BY/2.0	en	The Chron Proxy Ontology defines different types of chron proxies that we can find in a chron climate dataset.

Alternatively, you can access programatically with the following commands:

• Turtle
  • curl -sH "Accept: text/turtle" -L http://linked.earth/ontology#
• RDF/XML
  • curl -sH "Accept: application/rdf+xml" -L http://linked.earth/ontology#

Contributing to the ontology

To suggest changes to a term in the core ontology, start a discussion on its wiki page (all terms and properties have associated wiki pages). Once a community consensus has been reached, use this form to contact the Editorial Board about the change.

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