This is an Expression representation of "image-pitch-displacement".
The displacement off the center of the top image and the shadow image when the pitch of the map is greater than 0. This helps producing a three-dimensional appearence.
This is an Expression representation of "perspective-compensation".
The amount of the perspective compensation, between 0 and 1. A value of 1 produces a location indicator of constant width across the screen. A value of 0 makes it scale naturally according to the viewing projection.