Projection

Calculates a map point at the specified screen point.

The function returns an empty value if the specified screen point is outside the map projection.

Calculating the screen point corresponding to the specified map point.

The function returns an empty value:

• if the point has an invalid value (latitude is outside the range -90;90 or longitude is outside the range -180;180).
• if the specified map point is above the projection plane of the map on the screen.
• if the specified map point is too far beyond the screen and the type overflow occurs.

Calculates the screen point corresponding to the specified map point with elevation.

The function returns an empty value:

• if the point has an invalid value (latitude is outside the range -90;90, longitude is outside the range -180;180, or elevation is negative).
• if the specified map point is above the projection plane of the map on the screen.
• if the specified map point is too far beyond the screen and the type overflow occurs.

Calculating the nearest map point to the projection of the specified screen point.