The related concepts in PSDK Positioning function

Target Point: The position where the positioning information is obtained, such as the center point of the gimbal.
NOTE The target point of the M210 RTK V2 and M300 RTK is the center point on the upper surface of the adapter ring of the payload. The payload needs to be mounted on the Gimbal I.

Interest Point: The position of a device on the payload specified by the user arbitrarily, such as the center point of a camera image sensor. The target point can also be a point of interest.
Task: A set of multiple continuous flight actions is called a task, such as performing a mapping task on a certain area.
Positioning Event: An event that triggers a positioning request. If a positioning request is triggered when a camera is exposed, "camera exposure" is a positioning event; a collection of multiple events is an event collection. Payload developed based on PSDK can request multiple position information at the same time, such as camera co-exposure.

Details refer to https://developer.dji.com/document/d34a11d2-e7df-4b43-a5f7-a96db51612aa .