VIA Technologies EPIA SN-Series Specifications download pdf (Page 34)

Remote Sensing and Photogrammetry, State of the Art Technologies

Large format cameras are typically sets of multiple medium-format cameras coupled

together to form an integrated unit, notwithstanding some military devices, used for

reconnaissance, employs very large CCD array (up to 100 Megapixels) which are

available in very limited quantities. The resulting images or sub images are then rectified

and stitched together to form a single, large format, digital monochromatic image.

The Vexcel UltraCam-Xp (UC-Xp) is composed by four in-line lens arrangement

used in conjunction with multiple monochrome CCDs. Images are coloured using pan-

sharpening technique using data from the four additional small format multispectral

images that are collected simultaneously. UC-Xp generates panchromatic images of

17130 x 11310 pixels while multispectral (RGB + nIR) images are 5770 x 3770 pixels.

GSD from an altitude of 500 m is about 2.9 cm.

Figure 23: Vexcel UltraCAm Xp [Ref. (11)] and the Intergraph DMC [Ref.(12)]

The Intergraph DMC is another example of large format camera. Inside an external

rigid body are installed two separate lens groups. The first one is composed by four 120

mm lenses placed in the housing center, each camera uses a 7168x4096 pixels CCD with

a pixel pitch of 12 µm. Cameras are slightly tilted in order to create a small overlapping

zone between every frame. Acquired images are 13824x7680 pixels. Other four, small

format cameras, equipped with wide angle lenses, are used to for the RGB + nIR bands,

as in the UC-Xp. From an altitude of 2000 m the resulting swath width is about 2880 m

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VIA Technologies EPIA SN-Series Specifications Page 34