Table of Contents

Conceptual

Units

All messages MUST use SI units for all measurements e.g.

Units MUST be specified in all message documentation / field names (where names are applicable).

Measurements

All relative measurements MUST have a known origin / datum. This must either be specified or a standard documented origin / datum. All measurements MUST be specified at the appropriate scale and precision. E.g. using double precision millimeters (mm) for altitude would be better served by using single precision meters (m).

Altitude

Altitude measurements MAY specify a datum they are relative to. If omitted, the measurements MUST be relative to the WGS84 datum.

Elevation

Elevation MUST be assumed relative to ground. In this instance the ground altitude MUST be the datum for the elevation and specified as per an altitude measurement.

Latitude / Longitude

All latitude / longitudes MUST be specified using the WGS84 (ESPG/SRID 4326) geodetic model.

Drone capabilities

Drones MUST report their capabilities to the airspace information provider in order for the provider to provide accurate data. These capabilities MUST include:

Sensors

Drones' sensor suites MAY consist of zero or more sensors. For example:

Each sensor type MUST be defined and have a known minimum set of capabilities. Where accuracy may vary from reading to reading, accuracy MUST be sent along with any sensor reading. This MUST supersede any accuracy sent as part of a sensor definition.

Additionally the capabilities MAY include other custom elements.

Security

All communications over phone MUST take place over a secure transport channel. E.g. TLS.

Identity

Certificate based? Provision for identity services with trusted CAs?

TBD