ofĬharlton, MA processed the remaining area west of this line (approximately 72 degrees longitude), as well as the Islands. Intermap Technologies of Englewood, Colorado and Ottawa and Calgary, Canada processed the mainland portion of the Commonwealth east of the 165000-meter line (in MA State Plane coordinates) and Chas. The processing of the photos was conducted by two firms. Endlap (forward overlap) was 60%, except 80% in areas with tall structures, with (high) sidelap of 42%. The flying altitude was approximately 15,000 feet to provide an original photo scale of 1” = 2,500’. Each camera was also equipped with a tie to the aircraft GPS receiver. KAS used large format Leica RC-30 calibrated aerial mapping cameras employing forward motion compensation and gyro-stabilized mounts. Keystone Aerial Surveys Inc. (KAS) of Philadelphia, PA acquired the aerial photography for the entire project using Kodak AeroColor 2444 and AeroColor 2445 film.
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