Photo Science Inc. of Gaithersburg acquired Piedmont Aerial Surveys of Greensboro, N.C., for an undisclosed amount. Both firms offer a variety of computerized mapping and surveying and aerial photography services.

The 35-year-old Photo Science and the 38-year-old Piedmont Aerial have worked together on a variety of projects, but the acquisition allows both firms to expand their services, said Bryan J. Logan, president of Photo Science. Piedmont, which has annual revenue of about $1 million, will remain an independent operation.

The two companies provide their mapping and aerial photography services to a number of clients, including federal, state and local governments, utility companies, engineers and surveyors.

Photo Science has about $5 million in annual revenue and 40 employees.

Logan said that demand for specialized, computerized mapping services, called photogrammetry, is increasing because local governments and private industry are relying more heavily on Geographic Information Systems -- databases that use layers of specific geographic information to help with such tasks as city planning, crop evaluation, taxation and emergency systems.

Virginia's Center for Innovative Technology of Herndon licensed a new software system that diagnoses and evaluates breast cancer and a form of hardening of the arteries to Dynatech Computer Systems Inc. of Mountain View, Calif.

Dynatech is exercising an option it was given to license the technology in an agreement signed with the center in 1990. Dynatech funded research on the technology at the University of Virginia.

Comsat Laboratories of Clarksburg, a division of Communications Satellite Corp. of Washington, was awarded a $2 million contract to define and specify the ground network that is needed to support the mobile communications satellite systems being set up by American Mobile Satellite Corp. of Washington and Telesat Mobile Inc. of Ottowa, Ontario.

American Mobile Satellite and Telesat Mobile have launched satellites to provide mobile communications systems in North America.

Although they will be offering their services to different customers, the companies have an agreement to provide each other with back-up service in the case of a satellite failure.

The two companies will use Comsat's findings to help set up independent ground networks.

Netrix Corp. of Herndon was awarded a subcontract for an undisclosed amount to provide a national integrated switching system network for the U.S. Courts.

Netrix is a subcontractor to IBM, which was awarded a $25 million contract by the U.S. Courts to supply a data communications network.

Okura & Co. Ltd. of Tokyo entered an agreement with Orbital Sciences Corp. of Fairfax to market OSC's Space Systems Division's launch products to Japanese customers.

International Business Services Inc. of Washington was awarded a multi-year contract by the Washington Metropolitan Airports Authority to manage the taxicab dispatch system at Washington National Airport. Terms were not disclosed.

Creative Strategy Inc. of Washington was awarded a contract by the National Wildlife Federation to develop a direct-mail circulation package for its two children's publications, Ranger Rick and Your Big Backyard.

Henninger Video of Arlington opened a regional marketing office in Richmond.

Announcements of news and developments affecting Washington area companies should be sent to Regional Report, Business News Department, The Washington Post, 1150 15th St. NW, Washington, D.C. 20071.