Flight Calibration of the LROC Narrow Angle Camera

D. C. Humm, M. Tschimmel, S. M. Brylow, Prasun Mahanti, T. N. Tran, S. E. Braden, S. Wiseman, J. Danton, E. M. Eliason, Mark Robinson

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Characterization and calibration are vital for instrument commanding and image interpretation in remote sensing. The Lunar Reconnaissance Orbiter Camera Narrow Angle Camera (LROC NAC) takes 500 Mpixel greyscale images of lunar scenes at 0.5 meters/pixel. It uses two nominally identical line scan cameras for a larger crosstrack field of view. Stray light, spatial crosstalk, and nonlinearity were characterized using flight images of the Earth and the lunar limb. These are important for imaging shadowed craters, studying ∼1 meter size objects, and photometry respectively. Background, nonlinearity, and flatfield corrections have been implemented in the calibration pipeline. An eight-column pattern in the background is corrected. The detector is linear for (Formula presented.) but a signal-dependent additive correction is required and applied for (Formula presented.). A predictive model of detector temperature and dark level was developed to command dark level offset. This avoids images with a cutoff at (Formula presented.) and minimizes quantization error in companding. Absolute radiometric calibration is derived from comparison of NAC images with ground-based images taken with the Robotic Lunar Observatory (ROLO) at much lower spatial resolution but with the same photometric angles.

Original languageEnglish (US)
JournalSpace Science Reviews
DOIs
StateAccepted/In press - Sep 21 2015

Fingerprint

cameras
flight
calibration
nonlinearity
lunar observatories
lunar limb
companding
Lunar Reconnaissance Orbiter
detectors
commands
robotics
field of view
crosstalk
craters
crater
photometry
limb
remote sensing
pixel
spatial resolution

Keywords

  • Calibration
  • Camera
  • LRO
  • Moon
  • Remote sensing

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Flight Calibration of the LROC Narrow Angle Camera. / Humm, D. C.; Tschimmel, M.; Brylow, S. M.; Mahanti, Prasun; Tran, T. N.; Braden, S. E.; Wiseman, S.; Danton, J.; Eliason, E. M.; Robinson, Mark.

In: Space Science Reviews, 21.09.2015.

Research output: Contribution to journalArticle

Humm, DC, Tschimmel, M, Brylow, SM, Mahanti, P, Tran, TN, Braden, SE, Wiseman, S, Danton, J, Eliason, EM & Robinson, M 2015, 'Flight Calibration of the LROC Narrow Angle Camera', Space Science Reviews. https://doi.org/10.1007/s11214-015-0201-8
Humm, D. C. ; Tschimmel, M. ; Brylow, S. M. ; Mahanti, Prasun ; Tran, T. N. ; Braden, S. E. ; Wiseman, S. ; Danton, J. ; Eliason, E. M. ; Robinson, Mark. / Flight Calibration of the LROC Narrow Angle Camera. In: Space Science Reviews. 2015.
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