Animal and Group Position events

[cookeac]

I have had requests for an event that identifies an animal or group of animals observed at a location.
This might be:

• An animal is identified by an EID reader in a very extensive farming operation where animals are only seen a few times a year. This confirms that the animal is still alive and was seen in that location.
• An ear tag or collar device locates an animal at a certain position so we know it was in a particular barn stall or outdoor paddock
• A farmer records that a group of animals (animal set or inventory classification) was grazing in a particular paddock.

[cookeac]

Proposed attributes (for group or individual animal events)

Attribute	Type	Comment
siteName	string	The name of a site, stall, field, or paddock. This is different from the location (identifier) attribute which represents the farm.
geometry	GEOJson geometry object	A geometry object (see https://github.com/geojson/schema/blob/main/src/schema/Geometry.js)

Alternatively, the group prefer that the geometry is defined as a simple latitude longitude point.

[cookeac]

I changed the title of this observation from "Animal and Group Location events" to "Animal and Group Position events" to avoid confusion with our use of "location" to mean a farm or holding.

A position may be a named position (such as a barn or pen) or a geospatial location (geometry).

[cookeac]

Based on discussions on #456 we could add a reference to a site (or area) Id, which would make it possible to link sorting commands and observation of animals at a site.