Raymond J. Mercil, 64, a retired chief of the photogrammetric division of the former Army Map Service, died Monday at his home in Potomac following a heart attack.

Mr. Mercil began his career in map-making while serving in the Army. He was born in Quebec, Canada, and moved to Newark, N.J., with his family about 1930. He enlisted in the Army Corps of Engineers in 1936 and was commissioned in 1942.

During World War II, he served in the Pacific theater and took part in the campaigns in New Guinea and the Philippines as a photo-mapping officer.

He moved to the Washington area in 1946 and joined the Army Map Service as a civilian cartographer. In the course of his career, he helped map the surface of the moon in connection with the Apollo moon explorations. He retired in 1972 as head of the agency's photogrammetric section.

Mr . Mercil held an active commission in the Army Reserves until 1965, when he retired with the rank of lieutenant colonel.

He was a member of the Montgomery Country Club, where he played golf, and was an amateur photographer.

Survivors include his wife, the former Lilian Owen, of the home; a son, Bryant, of Columbia, Md., two daughters, Jacqueline Urband of East Haddam, Conn., and Sandra Sinkovic of Falls Church, and four grandchildren.

The family suggests that expressions of sympathy to be in the form of contributions to the Heart Fund in Mr. Mercil's name.