Leica RCD105 digital camera

rcd in plane

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.

RCD CH39 SN20 was used up to day 224 2013

The raw calibration files include dark values, gains and camera parameters. These files can be found here 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
Last modified 4 years ago Last modified on Oct 17, 2013 3:20:46 PM

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