Diff for 'LROCNAC'

The Lunar Reconnaissance Orbiter Camera addresses the measurement requirements of landing site certification and polar illumination. LROC comprises a pair of narrow-angle cameras (NAC) and a single wide-angle camera (WAC).

MarsSI only redistribute and process NAC imagery, WAC imagery is better served through the global mosaic produced and distributed by USGS.

Instrument description

The two Narrow Angle Cameras feature a Cassegrain (Ritchey-Chretien) primary optics at f/3.59, with primary mirror diameter of 19.5 cm,[34] using push-broom imaging. At its original altitude of about 50 km, each NAC images pixels about 0.5-meter across, and the swath, which is 5064 pixels wide, is about 2.5 km across. The orbit was raised in 2011 to be elliptical, reducing the resolution in parts of the orbit to 2.0 m/px.

MarsSI simplifies the dataset by unifying the output of both cameras and only presenting one observation. Both EDR (LE and RE) products will be retrieved and are merged during the calibration step. If only one of the two images was available, the resulting product only incorporate this observaton. The product name do not include the LE/RE suffix.

Downloading and processing LROC NAC data

Imagery

Tutorial

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Pipeline information

The pipeline to process LROC NAC images uses both the USGS ISIS system and Ames Stereopipeline.

Data description

Images

Directory content

The content of an LROC product directory in MarsSI should look like:

MXXXXXXXXLE.IMG, MXXXXXXXXRE.IMG

raw data (EDR NAC), one file for LE camera, one for RE camera

MXXXXXXXX_RDR.cub

reflectance (irradiance/solar flux or I/F) called Radiometric Data Record, stitched in a single image

MXXXXXXXX_MRDR.tif

projected and georeferenced image from the RDR

References

• USGS ISIS software: https://isis.astrogeology.usgs.gov/
• Ames Stereo Pipeline: https://ti.arc.nasa.gov/tech/asr/groups/intelligent-robotics/ngt/stereo/