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Sensors
Photogrammetric restitution of aerial photos is one of the fastest and most cost efficient methods of capturing topographic and thematic data from the earth’s surface. In building an information system the most time consuming step in the process is the capture of data – irrelevant whether data capture is for the first time or a continuation of the process.
The ability to capture data over a large area within a short time frame, often a few hours, offers advantages with regard to content and geometric consistency, the latter attainable through the normally successive step of aerotriangulation. For the initial steps in aerial photography Hansa Luftbild operates four aircraft – ranging in type from the single engine Cessna 210 T to the twin engine Cessna 404 Titan. The yellow planes either take off from their local base Münster/Osnabrück International Airport or from the locality of their planned operations. In the latter case operations are often co-ordinated by Hansa Luftbild’s offices in Schiphol, the Netherlands; Riyadh, Saudi Arabia; or Dubai, the United Arab Emirates. According to requirements the aircraft are equipped with precision instruments, large format cameras (principally RMK TOP) manufactured by Zeiss, with formats of 23 cm x 23 cm and focal lengths between 8.5 cm and 60 cm. Flight planning for the photography missions is undertaken by the flight department of the Muenster office. According to the aerial imagery’s projected use different types of films are used e.g. black and white, colour and colour infrared (CIR) and processed in-house. Restitution of the aerial photography is carried out on high precision analytical or digital stereoplotters. The operator is able to view, as if wearing 3D glasses, a three dimensional model, can capture and extract information about buildings, transport routes, bodies of water, land use, terrain heights, and other topographic data in terms of the object’s geographical position and thematic classification in digital form. The spatial and thematic interpretation of aerial photos in the environmental field is carried out on the powerful Leica APT-2 stereoscope. |
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