VIA Technologies EPIA SN-Series Specifications download pdf (Page 33)

Remote Sensing and Photogrammetry, State of the Art Technologies

Medium format cameras that are in current use have been modified from existing

film cameras built by Hasselblad, Rollei, Mamiya and Contax with the film magazine

replaced by a modern digital back. Digital backs have been developed by several

companies like Phase One, Imacon and Jenoptik and most of these devices uses the

biggest CCDs available on the market with up to 65 Megapixels.

The largest supplier of medium format airborne digital frame cameras are Applanix (

a Trimble company) and Rollei. The Applanix product is the Digital Sensor System (DSS)

which is available in three different models, from 16 to 39 Mpixels. The system is

supplied with the Applanix POS/AV, which integrates an high grade IMU and a

differential GPS receiver, and a crab angle remover to be fixed inside the aircraft. The

DSS is also available in several multiple cameras configuration ranging from 2 to 4.

Rollei Aerial Industrial Camera (AIC) and IGI DigiCAM are very similar to the DSS but

they are not supplied with crab angle removers. Three-axis stabilized mounts are

available for medium format cameras and are able to compensate for roll and pitch

movements of ±23° and heading changes of ±13°.

The Digital Modular Aerial Camera (DiMAC) is a multicamera solution composed by

up to four cameras installed inside a cylindrical housing. Each camera is equipped with a

22 Megapixels CCD with a pixel pitch of 9 µm. One of the most important feature of this

camera is its forward motion compensation (FMC) technology which shift the image

plane of the sensor opposite to the motion direction with a proportional speed. The FMC

permits a longer exposure time avoiding image blurring. The output image is given by the

geometrical composition of the four single frames resulting in a 6500x8500 pixels photo.

The swath width from an altitude of 2000 m is about 1500 m and the corresponding GSD

(with 80 mm lenses) is 0.23 m.

Figure 22:Applanix DSS439 [Ref.(9)] and DiMAC Wide+ [Ref. (10)]

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VIA Technologies EPIA SN-Series Specifications Page 33