Volume XXXIX-B4
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XXXIX-B4, 511-516, 2012
https://doi.org/10.5194/isprsarchives-XXXIX-B4-511-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XXXIX-B4, 511-516, 2012
https://doi.org/10.5194/isprsarchives-XXXIX-B4-511-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

  01 Aug 2012

01 Aug 2012

IN-FLIGHT GEOMETRIC CALIBRATION OF THE LUNAR RECONNAISSANCE ORBITER CAMERA

E. J. Speyerer1, R. V. Wagner1, M. S. Robinson1, D. C. Humm2, K. Becker3, J. Anderson3, and P. Thomas4 E. J. Speyerer et al.
  • 1School of Earth and Space Exploration, Arizona State University, 1100 S. Cady Mall, Tempe, AZ 85287, USA
  • 2Space Instrument Calibration Consulting, Annapolis, MD, USA
  • 3Astrogeology Research Program, United States Geologic Survey, Flagstaff, AZ, USA
  • 4Center for Radiophysics and Space Research, Cornell University, Ithaca, NY, USA

Keywords: Calibration, Registration, Geometric, Sensor, Optical, Distortion, Accuracy, Temperature

Abstract. The Lunar Reconnaissance Orbiter Camera (LROC) consists of two imaging systems that provide synoptic and high resolution imaging of the lunar surface. The Wide Angle Camera (WAC) is a seven color push frame imager with a 90° field of view in monochrome mode and 60° field of view in color mode. From the nominal 50 km polar orbit, the WAC acquires images with a nadir pixel scale of 75 m for each visible band and 384 m for the two ultraviolet bands. The Narrow Angle Camera (NAC) consists of two identical cameras capable of acquiring images with a pixel scale of 0.5 to 1.0 m from a 50 km orbit. Each camera was geometrically calibrated prior to launch at Malin Space Science Systems in San Diego, California. Using thousands of images acquired since launch in June of 2009, improvements to the relative and absolute pointing of the twin NACs were made allowing images on the surface to be projected with an accuracy of 20 meters. Further registration of WAC and NAC images allowed the derivation of a new distortion model and pointing updates for the WAC, thus enabling sub-pixel accuracy in projected WAC images.