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NASA cannot certify a lunar landing site from a photograph alone. It can, however, combine orbital images with laser-derived elevation, thermal observations, lighting models, communications analysis and lander limits to narrow a broad region to places a particular spacecraft might reach safely. During descent, onboard cameras, lidar and navigation software add a close-range check and can divert the vehicle toward a less hazardous patch.
What Moon images reveal about a possible landing site
Orbital imagery is the first layer of a lunar site map. Cameras can show craters, ridges, scarps, boulders, block fields and other features large enough to be resolved from orbit. Those observations answer questions such as whether a proposed ellipse contains obvious obstacles, whether a route crosses a crater rim, and how much relatively level ground appears to be available.
A picture has important limits. Illumination can hide a depression or make a rough surface look smooth, while a shadow can be mistaken for a steep wall. Image scale determines which rocks are visible, and an image does not directly provide slope, height, bearing strength or the temperature a lander will experience. “Safe” therefore means safe for a specified lander, landing gear, mission timing and touchdown maneuver—not universally safe for every spacecraft.
Why NASA combines several measurements instead of relying on one image
NASA’s Lunar Reconnaissance Orbiter (LRO) mapping explanation describes complementary instruments rather than a single all-purpose camera. Laser ranging, visible imaging and thermal sensing expose different properties of the same ground.
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| Measurement | What it contributes | Typical decisions it informs |
|---|---|---|
| Orbital camera images (LROC) | Visible craters, boulders, blocks, ridges, scarps and other surface texture. | Screening obvious obstacles, identifying traversable terrain and locating scientifically interesting features. |
| Laser altimetry (LOLA) | Elevation points that can be converted into digital terrain models, slopes and relief. | Finding flatter areas, measuring slope variability and checking whether a site sits on a rim, terrace or depression. |
| Thermal observations (Diviner) | Temperature behavior that differs between loose regolith and exposed rock. | Flagging rocky or blocky ground that may look deceptively smooth in visible imagery and evaluating thermal conditions. |
A 2008 NASA LRO visualization described planned polar performance of roughly half-meter vertical and 50-meter horizontal elevation mapping after a year, plus imagery capable of resolving details down to about half a meter over stated swaths. Those were mission-planning expectations in that historical explainer, not a promise that every current polar location has identical resolution or coverage. Analysts must attach the actual resolution, viewing angle and lighting conditions to every map layer.
How NASA turns orbital data into a candidate region
1. Start with a broad science and operations screen
NASA’s 2022 Artemis III assessment used LRO data and accumulated lunar science to identify 13 possible regions near the lunar South Pole. The question was not simply “Which landscape looks attractive?” Teams asked whether a lander could reach the area under realistic launch, trajectory, lighting, communication and surface-stay constraints, and whether the region could support the mission’s science objectives.
2. Build a terrain model from aligned layers
Images and elevation data are registered to a common coordinate system. Analysts can then calculate slope and slope variability, map crater and block distributions, and identify terrain where shadows or viewing geometry make visual interpretation uncertain. Thermal information provides an independent clue about exposed rock. The result is evidence about terrain—not a binary safe/unsafe label.
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3. Eliminate locations that fail mission constraints
NASA’s October 2024 update refined the Artemis III list to nine candidate regions. The assessment considered science potential, launch-window availability, terrain suitability, Earth communications, lighting and the combined trajectory capabilities of the Space Launch System, Orion and the planned human landing system. A NASA Technical Reports Server abstract further describes joint assessment of slope, craters, blocks, rough terrain, communication, illumination and mission timing. Seasonal illumination changes and narrow mission opportunities can make only a fraction of a visually promising region usable for a particular flight.
4. Keep multiple sites inside each region
A candidate region is not a final touchdown point. Each region can contain several potential landing sites, and those sites require additional, site-specific evaluation. The later downselection from 13 to nine is a count of candidate regions, not a ranking of every lunar location or a declaration that one listed place will receive astronauts.
The trade-offs NASA evaluates together
| Constraint | What the map must answer | Why it can change the choice |
|---|---|---|
| Terrain | How steep and variable are the slopes? Where are craters, rocks, blocks and rough surfaces? | A lander may tolerate a modest slope but tip, slide or suffer leg damage on a larger obstacle or abrupt grade change. |
| Lighting and thermal environment | How long is the site illuminated during the planned surface stay, and where will shadows persist? | Low-angle sunlight can hide hazards, complicate navigation and create severe temperature contrasts. Seasonal geometry changes the usable window. |
| Communications | Can the site see Earth directly or through the mission’s relay architecture? | Loss of a communications link can limit command, health monitoring and science return even if the ground itself is landable. |
| Mission access | Can the launch window, trajectory and lander performance reach the site with usable fuel and reserve margin? | A nearby site may be inaccessible on the available launch date or incompatible with the spacecraft’s approach path. |
| Science and future use | Does the area provide access to scientifically important terrain or possible resources without unacceptable landing risk? | Scientific value and future infrastructure matter only after a mission can reach, operate and return from the location. |
Jacob Bleacher, NASA’s chief exploration scientist, summarized the ordering in NASA’s 2024 regional update: Finding the right locations for this historic moment begins with identifying safe places for this first landing, and then trying to match that with opportunities for science from this new place on the Moon.
The statement captures why a spectacular view is not enough: operational feasibility is screened first, then science value is balanced against it.
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Why the lunar South Pole is especially difficult
The South Pole is attractive because permanently or near-permanently shadowed areas may preserve volatiles, while nearby high points can receive sunlight for extended periods. The same geometry creates operational problems. Sunlight arrives at a low angle, producing long shadows and glare; steep terrain is common around crater rims; and some locations remain extremely cold while adjacent ridges are illuminated.
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NASA’s 2024 candidate-region update lists nine areas: Peak near Cabeus B, Haworth, Malapert Massif, Mons Mouton Plateau, Mons Mouton, Nobile Rim 1, Nobile Rim 2, de Gerlache Rim 2 and Slater Plain. They remain candidate regions with multiple possible sites, not confirmed landing coordinates.
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How a spacecraft checks the ground during descent
Orbital maps support navigation before touchdown, but they cannot show every hazard at the scale and lighting present on approach. NASA’s Safe and Precise Landing – Integrated Capabilities Evolution (SPLICE) concept combines preloaded maps with sensors on the vehicle.
Terrain Relative Navigation
Terrain Relative Navigation (TRN) compares live camera images with a stored orbital map to estimate the spacecraft’s position relative to recognizable surface features. This helps correct navigation errors that would otherwise place the vehicle outside its intended landing ellipse.
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Hazard Detection Lidar (HDL) scans the ground and creates a three-dimensional terrain map close to landing. NASA’s SPLICE overview describes the lidar imaging step at about 500 meters above the surface and a touchdown safe-site area approximately 100 meters in diameter. Those figures describe the SPLICE technology concept, not a universal altitude or footprint for every present or future lander.
The same overview explains that onboard computing searches the lidar map for hazards such as steep slopes or large rocks, then selects a safer site for a diversion when the vehicle has the propellant and control authority to do so. NASA describes the function this way: The HDL images surface terrain that could be a hazard for landings, such as steep slopes or large rocks.
Why orbital and onboard maps have different jobs
- Orbital mapping: establishes the regional terrain model, candidate coordinates and expected lighting and communications conditions before launch.
- Descent sensing: detects the actual approach geometry, shadows and hazards inside the final landing area and can support a last-second diversion.
- Vehicle software: decides whether a detected patch satisfies that lander’s slope, obstacle and stability limits.
The final safety boundary belongs to the lander
NASA’s Office of Inspector General emphasizes that each lander has design constraints governing the hazards it can overcome. A map must therefore be tested against landing-leg geometry, allowable tilt, engine plume interactions, obstacle size, navigation accuracy, propellant reserves and the vehicle’s ability to divert. A slope that is acceptable for one vehicle can be unacceptable for another.
NASA’s 2025 precision-landing article states an official lunar landing requirement of coming within 50 meters (164 feet) of the targeted site. The article also reports a March 2025 helicopter field test of hazard-detection lidar at Kennedy Space Center. That test demonstrates technology development; it is not evidence that a crewed lunar mission has already landed using the system.
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A practical workflow for mapping a future base location
- Define the mission: specify crew or cargo, planned surface duration, landing date, power needs, communications architecture and the lander’s certified limits.
- Choose broad regions: use orbital imagery, elevation, thermal data, science objectives and resource questions to remove areas that cannot support the mission.
- Generate terrain metrics: calculate slope, roughness, crater density, block hazards, elevation relief and uncertainty at the resolution relevant to the lander and surface vehicles.
- Model time-dependent conditions: simulate sunlight, shadow, surface temperature, Earth visibility, launch windows and approach trajectories for the actual mission dates.
- Designate primary and backup sites: retain alternatives within the accessible region in case lighting, communications or navigation conditions change.
- Load maps for descent: provide TRN with georeferenced orbital features and define the area in which HDL or an equivalent sensor can search for a diversion site.
- Validate on approach: compare live imagery and lidar with the map, reject terrain outside vehicle limits and divert only when guidance, fuel and communications margins permit.
- Update after landing: use surface observations to refine the hazard map before placing habitats, power systems, roads or science instruments.
Common mistakes when interpreting lunar maps
- Calling a region a landing site: a named candidate region contains many possible coordinates and has not been selected as the final touchdown point.
- Treating a photograph as a height map: visible texture does not provide reliable slope or elevation without altimetry and calibrated geometry.
- Ignoring scale: a map that resolves a 50-meter crater may not reveal a lander-threatening boulder; conversely, a high-resolution image may cover too little area for regional planning.
- Assuming lighting is fixed: the Sun’s low polar angle and seasonal motion alter shadows, thermal conditions and navigation visibility.
- Separating science from operations: a scientifically valuable location can still fail a communications, trajectory or lander-performance test.
- Confusing a technology test with mission certification: a helicopter or laboratory demonstration supports development but does not prove a completed lunar landing capability.
Key figures and status at a glance
| Figure or status | Meaning and qualification |
|---|---|
| 13 candidate regions (2022) | NASA’s initial Artemis III South Pole regional list. |
| Nine candidate regions (October 2024) | Refined Artemis III set documented by NASA and a later NASA Technical Reports Server abstract; still candidates, not final touchdown sites. |
| 50 meters (164 feet) | NASA’s stated official lunar landing requirement for distance from the targeted site, reported in a 2025 precision-landing article. |
| About 500 meters altitude | Altitude at which the SPLICE overview describes HDL imaging in its descent sequence; not a universal operational threshold. |
| Approximately 100 meters diameter | Safe-site touchdown area described for the SPLICE concept; not a guarantee for every lander. |
| Half-meter and 50-meter historical figures | Planned LOLA vertical and horizontal polar mapping performance cited in a 2008 LRO explainer, not uniform current coverage. |
What this means for future lunar bases
Landing safety is only the first filter for a base. A useful base map would combine a landable pad with nearby terrain that supports power, communications, mobility, science and logistics over many months or years. The best location may therefore be a relatively smooth site close to, but not inside, a permanently shadowed crater or a steep scientifically important ridge. Orbital images can reveal the relationship between those features; elevation and thermal layers indicate whether roads, cargo handling and equipment placement are practical.
As missions collect higher-resolution surface data, planners can replace assumptions with measured rock distributions, local slopes and thermal behavior. Until then, every proposed location should be described with its data resolution, illumination date, uncertainty and compatibility with a named vehicle. That is how Moon images become an engineering map rather than an attractive but misleading photograph.
For NASA’s Artemis planning, the governing principle is straightforward: imagery narrows the search, complementary measurements explain the terrain, mission analysis determines access, and onboard hazard avoidance protects the final descent. No single layer can provide the safety verdict by itself.
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