NASA cannot declare a lunar site safe from a single photograph. It can, however, combine orbital images with elevation, thermal, lighting, communications and trajectory data to narrow large regions into landing and future-base options. During the final descent, cameras, lidar and onboard computers add a close-range check for hazards that orbital maps cannot resolve.
What a lunar image can reveal
Orbital imagery is the first layer in a safety map because it covers enormous areas consistently. Cameras can show craters, ridges, scarps, bright and dark patches, ejecta, large boulders and the texture of slopes. Those observations help analysts reject obviously unsuitable ground and identify places that deserve higher-resolution study.
As an Amazon Associate I earn from qualifying purchases.
Visible craters, rocks and rough ground
A crater is more than a circular feature on a map. Its rim can create a steep slope, its interior may contain uneven blocks, and shadows can hide the true shape of the floor. Large boulders are direct collision and stability hazards for a lander. Closely spaced small craters indicate rough terrain even when an image looks smooth at a lower scale.
Elevation and slope
Laser altimetry converts range measurements into a digital elevation model. From that model, engineers calculate average slope, local slope changes, ridgelines, depressions and the amount of terrain that a lander would cross while descending or diverting. A broad area with a gentle average slope can still contain short, steep sections that exceed a vehicle’s limits.
#1 Best Overall
Thermal clues that images miss
Surface temperature adds information that visible light cannot provide. NASA’s Lunar Reconnaissance Orbiter (LRO) explainer describes how Diviner thermal observations can help distinguish rocky ground from loose material because rocks and granular surfaces heat and cool differently. A visually smooth patch may therefore be less benign than it appears.
Resolution has to be stated honestly
A 2008 NASA LRO visualization described planned polar-mapping performance of roughly half-meter vertical and 50-meter horizontal elevation detail after a year, along with imagery capable of showing features down to about half a meter over stated swaths. Those were mission-planning expectations in an older explainer, not a promise that every current polar location has identical resolution or coverage. Analysts must attach the sensor, date, viewing angle and scale to every measurement.
How NASA turns images into a landing map
1. Screen broad regions from orbit
NASA begins with regional questions rather than a single touchdown coordinate. LRO observations and accumulated lunar-science results identify terrain that may support a mission’s science goals while remaining reachable by the available spacecraft. A visually attractive landscape is not enough: the region must be accessible under the launch, trajectory, lighting and lander constraints of that mission.
Recommended Free Tools
2. Fuse complementary measurements
Each instrument answers a different question. Camera images locate recognizable features; laser altimetry supplies elevation; thermal data reveals material and shadow behavior. Combining these layers produces a more reliable terrain model than treating one image as a complete description. Analysts also compare observations made under different illumination conditions so that a dark patch is not automatically interpreted as a deep hole or a bright patch as level ground.
Rank #2
3. Measure hazards at the scale of the vehicle
Maps are evaluated using the lander’s actual tolerances. Teams examine slope and slope variability, crater size and spacing, boulder or block distribution, roughness, and the width of contiguous areas that meet limits. The relevant question is not “Does this look flat?” but “Can this specific lander touch down here with its legs, engines, sensors and remaining fuel?”
4. Overlay mission conditions
NASA’s 2024 Artemis III update says its refined assessments 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. The technical assessment also treats illumination as seasonal: a site may be lit during one opportunity and shadowed during another. A region with excellent terrain can therefore lose its opportunity if the launch date, flight path or surface-stay duration does not align.
As Lakiesha Hawkins of NASA’s Moon to Mars Program Office put it, Artemis will return humanity to the Moon and visit unexplored areas. NASA’s selection of these regions shows our commitment to landing crew safely near the lunar South Pole, where they will help uncover new scientific discoveries and learn to live on the lunar surface.
NASA’s candidate-region update describes that selection as a safety-and-science exercise, not a simple image contest.
5. Use the map during descent
Orbital data can be loaded before launch, but a spacecraft still needs to determine where it is and what is immediately below it. NASA’s Safe and Precise Landing Integrated Capabilities Evolution (SPLICE) concept describes Terrain Relative Navigation (TRN), which compares live camera views with preloaded orbital maps to estimate position relative to known surface features.
Rank #3
SPLICE also describes Hazard Detection Lidar (HDL). At about 500 meters above the surface in the overview’s descent sequence, HDL scans terrain and creates a three-dimensional map. Onboard processing identifies hazards such as steep slopes or large rocks and can select a safer diversion area. The same overview describes a touchdown safe-site area approximately 100 meters in diameter. These are SPLICE technology-description values, not universal operating thresholds for every lunar vehicle. NASA’s explanation is available at the SPLICE overview.
What “safe” means for a particular lander
Safety is a compatibility test between terrain and vehicle. NASA’s Office of Inspector General has emphasized that each lander has design constraints governing the hazards it can overcome. A slope acceptable to one vehicle may be too steep for another; a block that is harmless to a large, widely supported platform may damage a smaller lander or prevent stable contact.
Vehicle-specific limits
- Slope and tilt: landing legs, engine plume behavior and the vehicle’s center of gravity determine how much tilt is tolerable.
- Obstacle size: boulders, blocks and crater rims must be compared with leg clearance, engine placement and sensor line of sight.
- Surface continuity: a safe patch must be large enough for the vehicle’s footprint and any permitted diversion maneuver.
- Navigation accuracy: the spacecraft must know its position well enough to reach the mapped patch; recognition errors can turn a good map into a bad landing.
- Lighting and temperature: shadows can hide hazards, while thermal extremes affect hardware and the interpretation of surface materials.
The 50-meter landing requirement
NASA’s 2025 precision-landing article states an official lunar landing requirement of within 50 meters (164 feet) of the targeted site. That figure describes delivery accuracy, not a guarantee that every point inside a 50-meter circle is safe. Hazard maps and onboard diversion systems are needed because a target can be close to a suitable area yet still contain a crater, rock or steep edge.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →The same NASA article reported a March 2025 helicopter field test of hazard-detection lidar at Kennedy Space Center. The test supports technology development; it is not evidence that a crewed lunar mission has already landed using that system.
Rank #4
Artemis III candidate regions: what has and has not been selected
NASA announced 13 candidate Artemis III regions in 2022. In October 2024 it refined that list to nine. A later NASA Technical Reports Server abstract documents the downselection and says the regions remain candidates with multiple potential landing sites; further site-specific evaluation is still required. None of the names below should be presented as a final touchdown coordinate.
| Refined candidate region | Current meaning |
|---|---|
| Peak near Cabeus B | Artemis III candidate region; individual sites remain under evaluation. |
| Haworth | Artemis III candidate region; not a confirmed landing point. |
| Malapert Massif | Artemis III candidate region; access and hazards require site-level analysis. |
| Mons Mouton Plateau | Artemis III candidate region; the name does not identify a final pad. |
| Mons Mouton | Artemis III candidate region; multiple potential sites may be considered. |
| Nobile Rim 1 | Artemis III candidate region; mission conditions determine viable opportunities. |
| Nobile Rim 2 | Artemis III candidate region; terrain and illumination must be assessed together. |
| de Gerlache Rim 2 | Artemis III candidate region; not a final crewed landing location. |
| Slater Plain | Artemis III candidate region; final selection depends on engineering and science review. |
The nine-region announcement is documented in NASA’s October 2024 update. NASA’s own wording stresses that the next step is to match safe access with scientific opportunity. Jacob Bleacher, NASA’s chief exploration scientist, summarized the sequence: 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.
How candidate areas are compared
There is no single score that turns a lunar photograph into a ranking. Teams compare several constraint groups at once:
The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →| Constraint group | Questions the map must answer | Why it changes the decision |
|---|---|---|
| Terrain | What are the slopes, slope changes, roughness, craters and blocks? How large are continuous safe patches? | Determines whether the lander can touch down, remain stable and divert if needed. |
| Lighting and thermal environment | When is the ground illuminated, where do shadows persist, and how does the seasonal pattern change? | Controls power, visibility, temperature exposure and the duration of useful surface operations. |
| Communications | Can the site maintain Earth visibility or fit the mission’s communications architecture? | A technically safe site is impractical if command, navigation or science data cannot be supported. |
| Mission access | Which launch windows and trajectories reach the region, and what surface-stay time do they permit? | Trajectory geometry and timing can eliminate otherwise attractive terrain. |
| Science and future use | Does the area provide access to scientifically important terrain or potential resources while remaining operable? | Artemis must balance immediate crew safety with discoveries and possible later operations. |
Why the lunar South Pole is especially difficult
The South Pole is compelling because permanently or seasonally shadowed terrain and unusual lighting create important science opportunities. It is also operationally demanding. The Sun stays low on the horizon, producing long shadows that obscure relief and make some slopes difficult to interpret. Illumination changes with season and local topography, so a site can alternate between useful sunlight and deep shadow.
Low-angle light exaggerates some ridges while hiding others. Steep terrain near crater rims increases the chance that a broad orbital pixel contains several different elevations. Temperatures also vary sharply between sunlit and shadowed ground. For that reason, a polar landing plan needs time-tagged illumination and thermal analysis rather than a static daytime image.
From a landing site to a future base location
A base location uses the same core map but applies a longer time horizon. A landing can succeed on a small patch for a short surface stay; a base needs room for repeated arrivals, equipment placement, crew movement and future expansion. The map therefore has to identify not only one safe touchdown area but also nearby terrain that remains useful under changing light and communications conditions.
Layer the requirements
- Start with landing safety: remove slopes, crater rims, rocks and rough ground outside the lander’s tolerances.
- Check sustained operations: examine how sunlight, shadow and temperature change over the planned stay and across later opportunities.
- Preserve communications: verify that Earth visibility or the planned relay architecture supports routine operations.
- Keep science and resource access practical: favor locations close enough to important terrain or potential resources without forcing crews across hazardous ground.
- Retain alternatives: map multiple safe patches and approach paths so a mission is not dependent on one precisely located point.
These steps do not turn a regional map into a construction blueprint. Subsurface strength, dust behavior, hardware logistics and detailed engineering surveys would still need separate verification. Orbital imagery is a screening and planning foundation, not a complete site certification.
Common mistakes when interpreting Moon maps
- Confusing appearance with elevation: a smooth-looking image can conceal a slope or scattered rocks.
- Treating shadow as a hole: low Sun angles make depth hard to infer without elevation data and images from other lighting conditions.
- Mixing scales: a regional map may show a safe zone that contains vehicle-sized hazards invisible at that scale.
- Ignoring timing: illumination, communications and launch opportunities vary; a map without a date is incomplete.
- Applying one vehicle’s limits to another: “safe” has no universal slope, obstacle or stability threshold.
- Calling a candidate a destination: a named Artemis III region contains potential sites, not an announced final landing point.
The practical answer
NASA can use Moon images to map candidate landing and base areas by combining visible terrain, elevation and thermal evidence, then testing each area against sunlight, communications, trajectories, science objectives and lander capabilities. TRN and hazard-detection lidar extend that map into the final descent, where the spacecraft can recognize its position and divert around hazards. The result is a layered, mission-specific decision—not a universal safe-or-unsafe label attached to one orbital photograph.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
