Coordinate system

Every layer that you add to ArcScene™ has a spatial coordinate system, either projected or geographic. A scene also has a coordinate system, which overrides the coordinate systems of the layers within it.

This means that when you add a layer to a scene, its coordinate system is temporarily transformed to match the scene’s coordinate system. This transformation is called on-the-fly projection. It allows layers that have different coordinate systems to come into spatial alignment.

A new scene does not yet have a coordinate system. By default, it takes the coordinate system of the first layer you add to it. You can select a different coordinate system for the scene at any time, causing all layers within the scene to be reprojected on the fly.