title: Automatic ray-surface intersection method.
abstract: A vector ray-tracing method has been incorporated into programs which automatically select correct ray-surface intersections with both conventional and unusual surface configurations.
authors.affiliation: NASA Goddard Space Flight Center, Earth Survey Applications Division, Greenbelt, Maryland 20771, USA.
authors.forename: B J
authors.initials: BJ
authors.lastname: Howell
authors.forename: M E
authors.initials: ME
authors.lastname: Wilson