Photogrammetric Camera

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ICE BRIDGE: Photogrammetric Camera Toni Schenk, Ohio State University [email protected] Bea Csatho, University at Buffalo [email protected] Science Objectives 1. Precise surface reconstruction and surface roughness analysis 2. Determine velocities and strain rates from repeat flights 3. Determine control information for registering various sensors Specifications To meet science objectives we need: Ground Sampling Distance GSD = 0.1 m for low altitude flights Swath width SW = 300 m (comparable to ATM swath width) 3000 pixels across flight line Stereo capability for determining surface elevations, precision of elevations 0.1 m B/H ratio = 0.6 Base/Height (B/H) Ratio B H β Camera Requirements Metric properties: after calibration interior orientation should remain constant FOV To satisfy B/H ratio: ~60o To satisfy SW (ATM scan angle): 40o k Dynamic range: 12 – 14 bits k Resolution: 3000 pixels cross flight Camera Options Photogrammetric cameras (frame or multi-line) Require stabilized platform and port at least 400 mm diameter No ports available not an option 2009 High-resolution commercial cameras Canon EOS 5D Mark II (~21.1 MPixels) Nikon D3X (~24.5 MPixels) Proposed Camera Canon EOS 5D Mark II Available from Cirrus Digital Systems Practical experience from NASA High Altitude Mapping Program (John Arvesen) Issues: Metric stability Geocoding (synchronization with Applanix) Possible Configuration Canon EOS 5D Mark II has resolution of 5616 x 3744 pixels, nominal pixel size = 6.2 micron, comes with different focal lengths Mount long side along flight direction 3744 pixels cross track B/H = 0.6 B = 300 m (H = 500 m) exposure rate ~2 sec/frame Concluding remarks Canon best compromise under current circumstances Good chance to meet science objectives 2009 camera mission will provide most valuable data and experience Exact details about camera configuration still under discussion .

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