Robert J. Jackman, 57, a geologist with the U.S. Geological Survey for the past 30 years and a pioneer in lunar mapping research, died of cancer Saturday at Fairfax Hospital.

Mr. Hackman, who specialized in the application of remote sensing techniques to geologic studies, was the senior author of the first U.S. geologic and physiographic map of the lunar surface.

Recognized in the scientific community for his photogeologic techniques, he also invented and published papers on a number of scientific instruments, including the stereoscopic grid, the isopachometer, for which the federal government was granted a patent, and the stereo-slope comparator, which has been manufactured and sold around the world.

During the Apollo lunar mission, Mr. Hackman was a consultant to the National Aeronautics and Space Administration (NASA). He developed a technique for viewing telescopic moon photographs stereoscopically and was the key compiler of the geology of the visible moon surface.

After joining the Geological Survey in 1950, he was assigned to the Survey's Alaskan Geology Branch. His early work on the geologic mapping of northern Alaska by the interpretation of serial photographs and field data was widely used by the petroleum industry.

In 1964, Mr. Hackman used his techniques for a study of earthquake-damaged terrain based on 2,000 post-earthquake color aerial photographs.

He was a major contributor to the recently completed geologic map of the Colorado Plateau province and did innovative photogrammetric work on the Salina (Utah) Land Resource Folio, developing special-purpose land-use maps which portrayed coal resources, flash flood hazards and natural vegetation.

In recent years, Mr. Hackman was working on a detailed slope stability study of the slide-prone Appalachian Plateau. He also trained other geologists in stereo-plotting techniques.

Mr. Hackman was a contributing author of the Manual of Remote Sensing published by the American Society of Photogrammetry, of which he was a member.

He received a number of superior performance and incentive awards and recently was nominated to receive the Department of the Interior's Meritorious Service Award.

Mr. Hackman was born in Omaha, Neb. He earned a bachelor's degree in geology from American University and had completed courses in photogrammetry and photointerpretation.

He served in the Navy in the Pacific theater during World War II.

He lived in Oakton, Va., and was a member of the American and Washington geological societies, the Virginia Archeological Society, the Izaak Walton League, the National Audubon Society, the Sierra Club and the Nature Conservancy.

Survivors include his wife, the former Bettie L. Smysor, of Oakton.

The family suggests that expressions of sympathy be in the form of contributions to the American Cancer Society.