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This paper presents an overview of current developments in the airborne digital imaging technologies—including both digital frame cameras and pushbroom line scanners—and analyses them in the context of their applications to digital photogrammetry.

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The aerial photographs (APs) acquired by the Istituto Geografico Militare (IGM) in the period of the Italian occupation of Ethiopia (1935Ethiopia ( -1941 have recently been discovered, scanned and organised. Until recently, the oldest APs of the country that were available had been taken in the period [1958][1959][1960][1961][1962][1963][1964]. The APs over Ethiopia in 1935-1941 consist of 8281 assemblages on approx. 50 cm x 20 cm hardboard tiles, each holding a label, one nadir-pointing photograph flanked by two low-oblique photographs and one highoblique photograph. The four APs were exposed simultaneously and were taken across the flight line. The high-oblique photograph is presented alternatively at left and at right. There is approx. 60% overlap between subsequent sets of APs. One of Santoni's glass plate multi-cameras was used, with focal length of 178 mm and with a flight

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