= Leica RCD105 digital camera = [[Image(rcd_inplane_crop.jpg, align=right, nolink, title="RCD Camera")]] The RCD105 is a medium-format digital camera which is integrated together with the Leica ALS-50 Lidar system. == Raw data format == The RCD105 data are captured in compressed 12-bit .raw files of approximately 57MB size. To accompany the .raw files, various ASCII header files are generated. The most useful of these is the image events file which contains time stamp information for each photograph, including real-time aircraft position and attitude data. The raw file name convention is: `DDHHMMSSXXXXXXGN.raw` * DD = day of month * HHMMSS = timestamp * XXXXXX = incrementing picture id * G = gain (1-4) == Calibrations == The RCD system is calibrated at Leica's calibration factory. The latest calibration certificates are included here: RCD CH39 SN70 was used from day 260 2013. * [attachment:RCD105_SN70_Calibration_Certificate.pdf RCD SN70 Calibration Certificate, November 2010] RCD CH39 SN20 was used up to day 244 2013 * [attachment:RCD105_Calibration_Certificate_2010.pdf RCD SN21 Calibration Certificate, February 2010] * [attachment:RCD105_Calibration_Certificate_2008.pdf RCD SN21 Calibration Certificate, July 2008] The raw calibration files include dark values, gains and camera parameters. These files can be found here [wiki:InstrumentCalibration here] == Specifications == || Detector size || 39 Mega-pixels @ 7216x5412 resolution || || pixel size || 6.8 microns giving ~15cm resolution at 1350m flying height || || lenses || 60mm (changeable) with 44.2 degree x 34.0 degree FOV || || aperture || fixed f-4.0 || || exposure time || up to 1/4000 || || Maximum frame rate || 0.5 Hz || The shutter is a dual curtain, one opening to start the exposure and the other closing to finish it. * exposure will therefore occur at different times along the focal plane * 8ms for shutter to open and close, so there's a 4ms time difference between the top and bottom of the CCD acquiring light Lens distortion is a maximum of 2% at the edges of the field of view. * distortion measurements are available The CCD is a Bayer array (raw 7162 x 5389), with a pixel layout as below. In the final processed TIFF, these pixels are blended and interpolated to make a full RGB grid. || Blue || Green || || Green || Red ||