Abstract
Abstract. One of the primary objectives of the Lunar Reconnaissance Orbiter Camera (LROC) is to acquire stereo observations with the Narrow Angle Camera (NAC) to enable production of high resolution digital elevation models (DEMs). This work describes the processes and techniques used in reducing the NAC stereo observations to DEMs through a combination of USGS integrated Software for Imagers and Spectrometers (ISIS) and SOCET SET® from BAE Systems by a team at Arizona State University (ASU). LROC Science Operations Center personnel have thus far reduced 130 stereo observations to DEMs of more than 130 stereo pairs for 11 Constellation Program (CxP) sites and 53 other regions of scientific interest. The NAC DEM spatial sampling is typically 2 meters, and the vertical precision is 1–2 meters. Such high resolution provides the three-dimensional view of the lunar surface required for site selection, hazard avoidance and planning traverses that minimize resource consumption. In addition to exploration analysis, geologists can measure parameters such as elevation, slope, and volume to place constraints on composition and geologic history. The NAC DEMs are released and archived through NASA’s Planetary Data System.
Highlights
The Lunar Reconnaissance Orbiter Camera (LROC) consists of two narrow angle cameras (NACs) to provide 0.5 – 2.0 meterscale panchromatic images of a 5km swath and a wide-angle camera (WAC) to provide images at a pixel-scale of 100 meters in seven color bands over a 60km swath (Robinson et al 2010)
The NAC was not designed as a stereo system, but obtains stereo pairs through images acquired from two orbits, with the spacecraft making at least one off-nadir slew (Figure 1)
This paper describes the production and release of NAC digital elevation models (DEMs) produced by the Arizona State University (ASU) team
Summary
The Lunar Reconnaissance Orbiter Camera (LROC) consists of two narrow angle cameras (NACs) to provide 0.5 – 2.0 meterscale panchromatic images of a 5km swath and a wide-angle camera (WAC) to provide images at a pixel-scale of 100 meters in seven color bands over a 60km swath (Robinson et al 2010). The NAC was not designed as a stereo system, but obtains stereo pairs through images acquired from two orbits, with the spacecraft making at least one off-nadir slew (Figure 1). Slewing the spacecraft off-nadir interferes with data collection from other instruments, so LROC slew opportunities are limited to four per 24 hour period. Slew angles range between 0° and 30° and a convergence angle between images is typically between 10° and 45°
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