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February 28th, 2013
Microsoft Introduces 210mm Lens for UltraCam Eagle

The 210mm lens captures the same high dynamic, excellent quality, detailed imagery as other UltraCam systems, with the added benefit of flying at high altitudes, e.g., 5 cm imagery at a 2,000 m altitude. This allows data collection to take place over restricted airspace, such as cities, without applying for special permits. Despite the increased distance to the ground, the results of the AT and dense matching tests supports Microsoft’s belief that the base/height ratio is not the only important factor with respect to accuracy. The 210mm lens returns very accurate geometry even from a high altitude. Also, the small field of view minimizes building lean for tall buildings, allowing full utilization of the 20,010 pixel swath width for ortho image production. Occlusions are minimal even for narrow streets or alleys.

UltraCam Eagle customers also benefit from the greater radiometric dynamic produced by the UltraCam Eagle, which exceeds that of most other digital cameras available today. When mapping at high altitude, the atmosphere can lead to a loss of contrast and to color shifts. By capturing imagery in “Raw format” with the 210mm lens, more bits-per-pixel of image dynamic are collected and saved. During processing it is possible to  restore the colors without losing any data, and the high image dynamic allows for correction of haze, hotspots, and other artifacts, such as color shifts caused by the atmosphere. Due to this technology, the resulting images look more consistent and realistic.

“When compared to competing systems that use a Bayer pattern approach, the UltraCam Eagle 210mm lens demonstrates several clear advantages,” stated Alexander Wiechert, Microsoft Business Director. “Typically a Bayer pattern CCD reduces geometric accuracy. A small error on the CCD due to interpolations sums up to a big error on the ground due to the high altitude. Also, a Bayer pattern CCD collects less than a 12-bit image dynamic, which is almost half of the image dynamic captured by the UltraCam with the 210mm and other UltraCam Eagle lenses. That lower image dynamic typically results in lower image quality as there is no leeway to correct for the atmospheric effects.”

The UltraCam Eagle provides flexibility for Microsoft customers to use equipment that is most suitable for each project to maximize efficiency. The 210mm lens can be exchanged in a clean hangar environment by the customer’s personnel after training from Microsoft’s Support team without the need for re-calibration.

About Microsoft’s UltraCam Business Unit
With its operations based in Graz, Austria, and sales and support teams in North America, Microsoft’s UltraCam business unit brings more than two decades of photogrammetry expertise to Microsoft’s Bing Maps business unit. The division is responsible for the highly successful line of UltraCam digital aerial mapping systems that include the UltraCamLp, UltraCamXp, UltraCamXp Wide Angle, UltraCam Eagle and UltraCam Falcon digital photogrammetric sensors. Rounding out the UltraCam mapping systems offering is the UltraMap workflow software system for processing UltraCam imagery to Level 02 and Level 03 quality data, high-density point clouds, digital surface models, DSMOrthos and DTMOrthos.