Crandall Clifford J. Radar mapping in Panama

Photogrammetric Engineering. — 1969, Juli. — Vol. XXXV 7. — No 6. — P. 641 - 646.The APQ-97 side-looking radar system was used to produce a "radar mosaic" of a portion of Darien Province in the Republic of Panama, an
area which is persistently covered by clouds so as to prevent successful aerial mapping photography. To serve as control points, 5-foot corner reflectors were placed at 13 locations in the 6009 square-mile area through the use of helicopters. Six flight lines were successfully flown. The data reduction was handled by Raytheon / Autometnc. The resulting uncontrolled radar mosaic was used for
geologic and hydrologic purposes.