Daniel R. Cremons- Planetary Geology, Geophysics and Geochemistry Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States
Lidar has enabled advances in the knowledge of the Solar System through geophysical and atmospheric studies of the Moon, Mercury, Mars, and several asteroids. The technique will continue to be used to obtain high-precision topographic data from orbit, but new techniques on the horizon are suited to uniquely address fundamental planetary science questions related to the evolution of airless bodies, volatile delivery and sequestration, atmospheric transport, and small body formation and evolution. This perspective highlights the history of lidar in planetary science and identifies several measurement approaches that may be adopted in the coming years.
Introduction
Lidar (light detection and ranging) is a method of measuring a precise range between the instrument and the target using the time-of-flight of a transmitted laser pulse (Gardner, 1982; Sun, 2017; Zhou et al., 2017). When hosted as an orbital payload a lidar provides continuous ranging measurements to the surface, building up topographic profiles along the spacecraft track. Given a suitable orbit and measurement cadence, a topographic map of an entire planet can be constructed with centimeter to meter accuracy and precise geodetic control. Such orbital lidar measurements of the Moon and Mars have provided global topographic maps that stand as foundational datasets for science investigations and exploration efforts. By measuring the transmitted and reflected laser pulse energies, the reflectance of the surface at the laser wavelength can be determined regardless of natural illumination conditions or the thermal state of the surface.
In this perspective I briefly summarize the history of lidar for planetary science applications starting with the Apollo 15 laser altimeter and identify several future techniques and measurement concepts that are relevant to the most pressing planetary science questions. My intention is to highlight how the two fundamental lidar measurements (time of flight and received laser energy) can be used in new ways to provide unique science measurements. I limit this perspective to planetary science lidar investigations and do not focus on the wealth of Earth science lidar missions, ground-based, and airborne investigations, nor do I discuss the use of lidar strictly for navigation and guidance purposes, as is increasingly used for spacecraft docking, terrain relative navigation (TNR), and guidance and control for landing.
Lidar investigations on planetary science missions
Lidar, also referred to as laser altimetry, has played an important role in planetary science since the Apollo era. The recognition that laser altimetry could provide geodetically controlled, high-precision topographic measurements led to inclusion of the first planetary laser altimeter on the Apollo 15 mission in 1971. The Apollo 15 laser altimeter illuminated 30 m footprints at 30 km spacing during two equatorial orbits (Sjogren and Wollenhaupt, 1973). Even though the surface sampling was sparse by modern standards, this data was critical in developing the lunar shape parameters and constraining the topographic differences between large basins on the Moon, and discovering the far side basin known as the South Pole Aiken Basin (SPA) (Howard et al., 1974; Head, 1976). Following in the footsteps of the three Apollo laser altimeters were the Clementine lidar (Smith et al., 1997) and Lunar Orbiter Laser Altimeter (LOLA) (Smith et al., 2010) built by the National Aeronautics and Space Administration (NASA), the Chang’E-1 (Huixian et al., 2005) and Chang’E-2 (Zuo et al., 2014) lidars built by the China National Space Administration (CNSA), the SELENE laser (LALT) (Araki et al., 2008) built by the Japan Aerospace Exploration Agency (JAXA), and the Chandrayaan-1 laser altimeter (LLRI) (Goswami and Annadurai, 2008) built by the Indian Space Research Organization (ISRO). These instruments were designed to measure global lunar topography and roughness, constrain impact fluxes, explore volcanic landforms, and measure the lunar albedo at the laser wavelength (1,064 nm). Lidar can geodetically anchor measurements from other payloads such as cameras, spectrometers, and radiometers. Techniques that create topographic maps from imaging including shape from shading and stereophotogrammetry are increasingly common and usually offer higher spatial resolution and coverage at a lower cost than lidar mapping. However, they are reliant upon natural illumination conditions and often have lower vertical resolution than lidar-derived topography. A list of past, present, and planned planetary lidar instruments and their stated science objectives are given in Table 1.
TABLE 1. List of planetary lidar instruments and associated science goals.
Topography measurements derived from pulsed laser times-of-flight are the primary science product generated from lidar investigations on planetary science missions, and the technologies are relatively mature (Sun et al., 2013). The nine lunar orbital lidar instruments to date have primarily focused on topographic (Araki et al., 2009), slope (Kreslavsky and Head, 2016), and roughness measurements (Kreslavsky et al., 2013), although laser reflectance measurements have been used to look for cold trapped volatiles in polar regions of the Moon and Mercury (Lucey et al., 2014; Hayne et al., 2015; Deutsch et al., 2017). Beyond the Moon, the Mars Orbiter Laser Altimeter (MOLA) (Smith et al., 2001) on the Mars Global Surveyor (MGS) mission provided a global topographic map of Mars, and a similar campaign by the Mercury Laser Altimeter (MLA) (Cavanaugh et al., 2007) on the MESSENGER mission mapped much of the northern hemisphere of Mercury including polar volatile deposits. Four asteroid missions have carried laser altimeters for topography mapping, shape estimation, and landing site characterization: the Near Earth Asteroid Rendezvous (NEAR)–Shoemaker to asteroid 433 Eros (Zuber et al., 1997), the Hayabusa and Hayabusa2 missions to asteroid 25143 Itokawa (Yoshimitsu et al., 2009) and 126,173 Ryugu (Mizuno et al., 2017) respectively, and the Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer (OSIRIS-REx) mission to asteroid 101955 Bennu (Daly et al., 2017).
In addition to topography measurements, several lidar systems designed around backscatter measurements have characterized the Mars atmosphere. MOLA made measurements of clouds, dust, and aerosols during its polar orbit, providing the first three-dimensional distribution of Mars clouds (Smith et al., 2001). The Phoenix lander MET lidar (Whiteway et al., 2009) provided backscatter profiles from the surface to several kilometers in altitude at two laser wavelengths: 1,064 nm and the second harmonic of 1,064 nm at 532 nm. The ability to measure distributed aerosol backscatter is a key advantage of lidar over passive atmospheric techniques and has led to its ubiquitous use in Earth atmosphere studies. The Phoenix lidar measured the planetary boundary layer height as a function of time as well as the dust optical extinction and particle size distributions using the two laser wavelengths (Komguem et al., 2013).
Upcoming lidar investigations
Several missions nearing launch will carry laser altimeters using measurement techniques like those that have preceded them, though the targets and prospective mapping campaigns are increasingly ambitious. The BepiColombo mission will use the BepiColombo Laser Altimeter (BELA) (Thomas et al., 2021) to create the first complete lidar map of Mercury. The first ever lidar topography measurements of an outer Solar System body and ice world will be made by the Ganymede Laser Altimeter (GALA) (Enya et al., 2022) on the Jupiter Icy Moons Explorer (JUICE) mission. Phobos will be mapped and sampled using the MMX lidar (Senshu et al., 2021) aboard the Martian Moons Exploration (MMX) mission. Finally, a key test of planetary defence strategies and asteroid orbital dynamics will be supported by the Planetary Laser Altimeter (PALT) (Gordo et al., 2020; Dias et al., 2021) aboard the Hera mission to the asteroid65803 Didymos and its moonlet Dimorphos in support of the Double Asteroid Redirect Mission (DART) (Rivkin et al., 2021).
These four missions all carry laser altimeters designed primarily for time-of-flight measurements, though with several new laser and detector technologies aimed at reducing the size and weight and increasing ranging precision. A notable exception is the upcoming Lunar Flashlight mission (Vinckier et al., 2019; Cohen et al., 2020), which carries a new class of laser reflectometer to measure the lunar surface reflectance at four key infrared wavelengths to constrain the abundance of surface water ice in permanently shadowed regions near the lunar South Pole. This instrument is not designed to provide accurate range measurements, but the quasi-CW operation is not dissimilar to traditional lidar, and we include it in our discussion here. Notably, this will be the first planetary lidar to fly multiple laser systems operating at different wavelengths for surface spectroscopy, which will be discussed further in the next section.
Altimetry and beyond: The future of planetary lidar
The future of lidar in planetary science beyond the missions stated above will involve the utilization of proven techniques at new targets (e.g., the mapping of Ganymede by the GALA instrument), adoption of techniques pioneered in Earth science applications (e.g., gas-phase spectroscopy), and the development of new techniques where lidar can provide unique datasets (e.g., volatile mapping in permanently shadowed regions). In this section, I will discuss three areas in which I believe lidar techniques will evolve in the coming years and decades to uniquely tackle challenging planetary science questions (Figure 1). I stress that other nascent and mature lidar techniques exist that can also be readily applied to planetary science questions, and this list should be not taken as exhaustive or even comprehensive.
FIGURE 1. Overview of lidar investigations in planetary science. Past and current work focuses on topography (OLA-derived topographic map of asteroid 101955 Bennu, top left) and single-wavelength reflectance or normal albedo (LOLA-derived normal albedo map of the Moon, top right). Several future techniques on the horizon include swath-mapping lidar for high spatial resolution and coverage (surface terrain mapping, bottom left), atmospheric backscatter, trace gas, and Doppler measurements (Mars global dust storm, center bottom), and multispectral reflectance spectroscopy (permanently shadowed regions at the lunar South Pole, bottom right).
Topography
Lidar will continue to be a method of choice to create geodetically controlled topographic maps of planetary targets from orbit and will likely also expand to use on surface assets such as landers, rovers, or astronaut-deployed instruments. Scientific exploration of the Moon will focus on the South Pole as the region of interest due to visibility to Earth, presence of in situ resources, and select locations of almost constant illumination (Smith et al., 2020). Outside of these highly illuminated regions the terrain is an ever-changing mixture of partial or permanent shadow, which presents significant challenges to mapping with passive imagery. The permanently shadowed regions (PSRs) can experience darkness on geologic timescales (billions of years), preserving volatile species via cold trapping (Zhang and Paige, 2009; Mazarico et al., 2011). PSRs are sites of high scientific interest for their ability to preserve volatiles from early Solar System history and provide in situ resources for exploration. Comprehensive mapping of the South Pole to assess illumination and hazard conditions, as well as further investigate these dark regions on the exploration scale (meters) is a task well-suited for lidar, though high resolution maps will require new technologies that improve the spatial resolution over present approaches.
Two techniques that can enable higher resolution topographic mapping are scanning lidar and swath mapping lidar. Scanning lidar, which was first used in a planetary context on the OSIRIS-REx laser altimeter, uses a beam pointing mechanism to move a small laser footprint across the lidar field of view (Raj et al., 2020). Beam pointing mechanisms currently in use include optomechanical (mirrors and prisms such as the mirror on OLA), electromechanical and microelectromechanical systems (MEMS) (Kasturi et al., 2016), and nascent solid state mechanisms including optical phase arrays (Bhargava et al., 2019), photonic waveguides (Abe et al., 2018), and adaptive wavelength scanning (Yang et al., 2022). Scanning lidar is becoming commonplace in industrial and automotive lidar applications (Thakur, 2016) but has recently entered the aerospace sector (Nimelman et al., 2005; Daly et al., 2017; Bo et al., 2019). Terrestrial scanning lidar has been widely used in Earth science and surveying applications to create high-resolution digital elevation models (DEMs). Similar approaches will likely be applied to the lunar South Pole in support of NASA’s Artemis campaign in coming years. From orbit, scanning lidar allows for a broader cross-track area to be sampled, which can increase mapping coverage and reduce repeat sampling of the same terrain.
Swath mapping lidar involves the use of pixelated detectors that record a time-of-flight for each pixel, giving contiguous coverage of the detector field of view with tens to hundreds of simultaneous measurements (Glennie et al., 2013; Meigs, 2013; Sun et al., 2021). The transition from a few beams, as was used on LOLA, to dozens of adjacent pixels will lead to orders of magnitude increases in spatial resolution and coverage, although to maintain the link margin an increase in laser power is often required. These two techniques, separately or in tandem, can lead to higher resolution topographic maps to resolve fine scale surface roughness, provide improved geodetic measurements of tidal response, and identify new surface morphologies across the Solar System.
Reflectance spectroscopy
A crucial aspect of lidar measurements is that the angle between the incidence of light on the surface and the emission of light to the receiver is zero, meaning the observation geometry is always uniform. This makes global and time-of-day comparisons between measurements simpler and more robust than for passive measurements which require thermal, surface slope, and illumination correction. In addition, the finite laser pulses enable the removal of background illumination from the Sun or thermal emission from the surface or atmosphere by measuring the signal between laser pulses (i.e., the noise) This last aspect is particularly advantageous for questions related to volatile delivery, migration, and retention; processes which are likely dependent on surface temperature and solar illumination (Lucey et al., 2021).
The uniform measurement geometry and active laser source enables high signal to noise ratio regardless of solar illumination and perform better over the most scientifically desirable shadowed terrain. Spectroscopic lidar operates by measuring the surface reflectance both on and off infrared absorption features for the volatile or mineral species of interest. Depending on the choice of laser wavelengths, measurements of the surface reflectance within PSRs would constrain the abundance of surface volatiles including water ice, carbon dioxide, and organics, as well as water or hydroxyl ions bound within minerals or adsorbed on the surface. As with other lidars, spectroscopic lidar could be used to create a topographic map that is directly tied to the volatile abundance measurements. Spectroscopic lidar would excel in planetary applications involving unilluminated or rapidly changing illumination conditions where passive techniques suffer from low signal and uncertainty in thermal correction. When used in combination with passive remote sensing instruments, a high-resolution, global, low-bias dataset can be generated. This concept was proposed for the Lunar Volatiles Orbiter, which combined an imaging spectrometer with a spectroscopic lidar (Lucey et al., 2017). Global spectroscopic reflectance measurements taken at all latitudes, times of day, and surface temperatures would offer unique insights into the generation, migration, sequestration, and destruction of water, hydroxyl, and other volatiles.
Atmospheric absorption and doppler-resolved backscatter
The narrow spectral linewidth of lidar laser transmitters may enable gas-phase spectroscopy in planetary atmospheres using either light reflected from the surface or backscattered from the atmosphere. Differential absorption lidar (Browell et al., 1998) involves measuring the relative absorption of laser wavelengths both on and off absorption lines from an atmospheric constituent of choice. Earth science applications of this technique have focused on measuring the abundance of ozone (Browell, 1989), water vapor (Spuler et al., 2015; Nehrir et al., 2017), carbon dioxide (Koch et al., 2004; Abshire et al., 2010), and methane (Kiemle et al., 2014, 2011). Potential planetary science applications include measurements of water vapor and elusive methane at Mars, methane and tholins at Titan, and plume backscatter measurements at Enceladus. Extremely narrow laser linewidths in the megahertz regime enable Doppler-resolved backscatter profile measurements that can be converted into vector wind profiles (Chanin et al., 1989; Korb et al., 1998; Cremons et al., 2020). There is a paucity of direct wind speed measurements in planetary atmospheres, and only recently has the ADM-Aeolus mission (Reitebuch, 2012; Witschas et al., 2020) provided global wind measurements of Earth. Wind measurements on Mars or Titan would constrain energy and material transport mechanisms and haze formation, as well as aid in understanding the modern Mars atmosphere including the development of the polar caps and how wind shapes the landscape (MEPAG, 2020). Compared to high-resolution topography and reflectance spectroscopy, the differential absorption and Doppler techniques face greater implementation challenges at present due to the very narrow laser linewidths and spectral receiver stability required while under challenging operational conditions.
Summary
Lidar has been a cornerstone remote sensing technique throughout the history of planetary science by providing foundational datasets in the form of global topographic maps for the Moon, Mercury, Mars, and several asteroids. The fundamental measurement capabilities of ranging and laser reflectance will continue to be utilized in the near term on new and exciting planetary targets. Maturing lidar technologies from other industries will continue to lower the cost of simple rangefinders for inclusion on lower cost SmallSat and CubeSat missions and cases where ranges in the tens to hundreds of meters are sufficient. Looking further ahead, advancements in laser and detector technology will result in a leap in spatial resolution and coverage. The use of new and multiple laser wavelengths will turn lidar into a spectroscopic technique that can measure regions in shadow with uniform viewing geometry irrespective of the thermal state of the surface. Although more technically challenging, narrow-linewidth lidar at Mars or Titan could provide high-resolution spectroscopy of key atmospheric constituents or provide vertical wind profiles for the first time.
Data availability statement
Publicly available datasets were analyzed in this study. This data can be found here: The lidar-based DTM for asteroid 101,955 Bennu is the OLA V20 PTM which is described in Daly, M. G. et al., 2020, Hemispherical Differences in the Shape and Topography of Asteroid (101955) Bennu, Science Advances, 6 (41), eabd3649. The LOLA-derived albedo map and PSR maps were generated using the ACT Lunar QuickMap and data products described in Lemelin, M., P. G. Lucey, G. A. Neumann, E. M. Mazarico, M. K. Barker, A. Kakazu, D. Trang, D. E. Smith, and M. T. Zuber. “Improved calibration of reflectance data from the LRO Lunar Orbiter Laser Altimeter (LOLA) and implications for space weathering.” Icarus 273 (2016): 315-328 and Diviner-derived polar summer maximum temperature as described in Williams, J.-P., et al. (2019). Seasonal polar temperatures on the Moon. Journal of Geophysical Research: Planets, 124, 2505–2,521. https://doi.org/10.1029/2019JE006028.
Author contributions
DC: Conceptualization, investigation, writing—original draft preparation, writing—editing and revising, visualization. All authors have read and agreed to the published version of the manuscript.
Funding
This study was supported by the NASA Goddard Space Flight Center Internal Research and Development Program.
Conflict of interest
The author declares that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
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Keywords: lidar, planetary science, topography, altimetry, reflectance, mapping, volatiles
Citation: Cremons DR (2022) The future of lidar in planetary science. Front. Remote Sens. 3:1042460. doi: 10.3389/frsen.2022.1042460
Received: 12 September 2022; Accepted: 05 October 2022;
Published: 21 October 2022.
Edited by:
Dong Liu, Hefei Institutes of Physical Science (CAS), ChinaReviewed by:
Tim Kane, The Pennsylvania State University (PSU), United StatesCopyright © 2022 Cremons. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Daniel R. Cremons, daniel.cremons@nasa.gov