Within NASA Gap
Why One Sensor Is Often Not Enough
A single camera record can stay ambiguous because it cannot separate object motion, sensor artefacts, reflections and missing range.
On this page
- What a single recording can and cannot prove
- How artefacts, reflections and distance errors survive review
- What extra measurements would change the assessment
Page outline Jump by section
Introduction
A single video or sensor record can leave a reported unidentified anomalous phenomenon (UAP) genuinely unresolved without implying that the object itself is extraordinary. The central problem is that one sensor rarely measures enough independent information to distinguish between a real object’s motion, the observing platform’s own movement, optical artefacts, atmospheric effects, or simple uncertainty about distance. NASA’s 2023 Independent Study Team identified this lack of multiple measurements as one of the main reasons many UAP reports cannot be confidently classified, alongside poor calibration, incomplete metadata and the absence of baseline observations. [NASA Science]science.nasa.govNASA ScienceIndependent Study Team ReportIndeed, several apparent UAP have been demonstrated to be sensor artifacts once appropriate cali…
For automated instrumented UFO detectors, this is a design lesson rather than a philosophical one. The objective is not merely to record unusual events but to collect enough independent measurements that common explanations can either be confirmed or eliminated. Until that happens, an “unresolved” case often reflects limits in the available data rather than evidence for an exotic phenomenon.
What a single recording can and cannot prove
A single camera provides a two-dimensional projection of a three-dimensional scene. It records brightness, colour or infrared intensity across an image, but usually does not measure how far away an object is. Without range, almost every estimate of size, speed and acceleration depends on assumptions.
This creates several unavoidable ambiguities.
- A small nearby object may appear identical to a much larger distant one.
- Apparent rapid motion may result from the camera platform moving rather than the target.
- A change in viewing angle can create the illusion of sudden acceleration.
- Camera zoom, stabilisation and image processing may alter the apparent behaviour of an object.
NASA’s report repeatedly stresses that many existing UAP records were never intended as scientific observations. They often lack verified information about camera settings, pointing direction, calibration, processing history and observing conditions, preventing reliable reconstruction of what actually occurred. [NASA Science]science.nasa.govNASA ScienceIndependent Study Team ReportIndeed, several apparent UAP have been demonstrated to be sensor artifacts once appropriate cali…
Even an apparently sharp image therefore answers surprisingly few questions by itself. It shows that something produced photons reaching the detector. It does not automatically establish the object’s distance, physical dimensions, velocity or origin.
Why distance is the missing measurement
Range is arguably the most important quantity missing from most single-sensor UAP observations.
Velocity depends on both angular motion across the image and distance. An object moving one degree across the camera’s field of view could be:
- an insect a metre away,
- a bird hundreds of metres away,
- an aircraft kilometres away.
Without independent range measurement, each interpretation can produce very different estimates of speed while fitting the same recorded image.
The same uncertainty affects estimates of acceleration and manoeuvrability. Claims that an object executed extreme turns or impossible speeds frequently depend on assumed distance rather than directly measured distance. If the range estimate changes, the inferred performance may change dramatically as well.
The U.S. Department of Defense’s All-domain Anomaly Resolution Office (AARO) has published explanatory material showing how forced perspective and parallax can produce misleading impressions of speed and motion when observers or sensors move relative to poorly constrained targets. [AARO]aaro.milForced Perspective and Range Estimation. Figure 1: Example of…Read more…
How artefacts and reflections survive careful review
Some unresolved recordings remain ambiguous even after detailed analysis because several competing explanations remain consistent with the available evidence.
Optical reflections
Internal reflections between lens elements can generate bright spots or ghost images that move with camera orientation rather than with an external object. Unless camera geometry and lens characteristics are known, these artefacts can be difficult to eliminate completely.
Infrared systems introduce additional complications because reflections, detector blooming and thermal contrast may create shapes that do not correspond directly to physical structure.
Sensor processing
Modern cameras rarely preserve raw detector output.
Automatic exposure adjustment, digital sharpening, compression, stabilisation and noise reduction all modify recorded images. If investigators receive only a compressed video rather than original sensor data, distinguishing genuine features from processing artefacts becomes substantially harder.
NASA specifically notes that several apparent UAP have ultimately proved to be sensor artefacts once calibration and metadata became available. [NASA Science]science.nasa.govNASA ScienceIndependent Study Team ReportIndeed, several apparent UAP have been demonstrated to be sensor artifacts once appropriate cali…
Atmospheric effects
Heat shimmer, haze, cloud edges and changing refractive conditions can distort apparent position and shape.
Because these effects vary over time, they may resemble object motion in short clips while leaving insufficient evidence to determine whether the movement originated in the atmosphere, the sensor or the observed object.
Why independent sensors change the problem
A second independent measurement does more than provide another opinion. It adds new geometry.
Two separated cameras observing the same target can estimate distance through triangulation if their positions and pointing directions are accurately known. Once range is measured, estimates of speed, altitude and acceleration become far more reliable.
Other sensor combinations solve different uncertainties.
Sensor combinationPrimary uncertainty reducedTwo calibrated camerasDistance through triangulationOptical camera plus radarPosition, range and radial velocityVisible plus infraredThermal behaviour versus reflected lightCamera plus ADS-B aircraft dataElimination of known aircraftCamera plus weather measurementsAtmospheric explanations
This principle is well established outside UAP research. Multi-camera photogrammetry is widely used because multiple viewing angles overcome the depth ambiguity inherent in single images. [MDPI]mdpi.comMulti-Camera Imaging System for UAV Photogrammetryby D Wierzbicki · 2018 · Cited by 86 — In addition, the use of a multi-camera syste…
Why unresolved does not mean unexplained
A common misunderstanding is to treat an unresolved UAP as evidence that ordinary explanations have been ruled out.
In practice, unresolved often means something narrower: the available data are insufficient to discriminate among several plausible explanations.
For example:
- an object may be consistent with a balloon but lack enough range information for confirmation;
- an apparent rapid manoeuvre may be compatible with parallax but impossible to prove from the available imagery;
- a thermal signature may match several different object types because the sensor lacks sufficient spatial resolution.
AARO has publicly noted that some cases remain unresolved because technical information is incomplete rather than because anomalous performance has been demonstrated. Its published assessments also emphasise that ambiguity itself should not be interpreted as evidence of extraordinary technology. [Reddit]reddit.comThis report remains unresolved due to lack of technical data.Read moreAARO has posted another unresolved case (video): "This…May 16, 2025 — This footage, captured by an infrared sensor in 2024, was…
This distinction is central to scientific investigation. An unresolved classification measures uncertainty in the evidence, not necessarily unusual behaviour by the observed object.
What extra measurements would change the assessment
The weakness of a single sensor directly informs how automated detector systems should be designed.
The most valuable additions are not necessarily higher-resolution cameras but independent measurements that constrain competing explanations.
High-priority improvements include:
- precise time synchronisation across all instruments;
- two or more spatially separated cameras for triangulation;
- calibrated optical and infrared imaging collected simultaneously;
- accurate sensor orientation and platform motion recording;
- local weather measurements;
- automatic correlation with aircraft, satellite and astronomical databases;
- preservation of raw sensor output together with complete metadata.
Several current scientific proposals for dedicated UAP observation systems adopt exactly this philosophy, advocating multimodal observatories that combine optical, infrared and other calibrated instruments rather than relying on isolated video clips. [arXiv]arxiv.orgThe Scientific Investigation of Unidentified Aerial Phenomena (UAP) Using Multimodal Ground-Based ObservatoriesMay 29, 2023…
For automated instrumented UFO detectors, the implication is straightforward. The goal is not simply to detect unusual objects more often. It is to reduce ambiguity by ensuring that future observations contain enough independent measurements that analysts can estimate range, eliminate artefacts, account for environmental conditions and determine whether an event represents an ordinary object, a sensor effect or a genuinely unexplained observation.
Amazon book picks
Further Reading
Books and field guides related to Why One Sensor Is Often Not Enough. Use these as the next step if you want deeper reading beyond the article.
An introduction to error analysis
First published 1982. Subjects: Expériences, Physical measurements, Foutenleer, Error analysis (Mathematics), Physique.
Digital Image Processing, Global Edition
First published 2018. Subjects: Image processing, digital techniques.
eBay marketplace picks
Marketplace Samples
Live-tested eBay searches with available results related to this page.
Endnotes
-
Source: science.nasa.gov
Link: https://science.nasa.gov/wp-content/uploads/2023/09/uap-independent-study-team-final-report.pdfSource snippet
NASA ScienceIndependent Study Team ReportIndeed, several apparent UAP have been demonstrated to be sensor artifacts once appropriate cali...
-
Source: nasa.gov
Title: update nasa shares uap independent study report names director
Link: https://www.nasa.gov/news-release/update-nasa-shares-uap-independent-study-report-names-director/Source snippet
UPDATE: NASA Shares UAP Independent Study Report14 Sept 2023 — We found that NASA can help the whole-of-government UAP effort through sys...
-
Source: aaro.mil
Link: https://www.aaro.mil/Portals/136/PDFs/Information%20Papers/AARO_Effect_of_Forced_Perspective_and_Parallax_View_on_UAP_Observations_2024.pdfSource snippet
Forced Perspective and Range Estimation. Figure 1: Example of...Read more...
-
Source: aaro.mil
Link: https://www.aaro.mil/Portals/136/PDFs/Information_for_UAP_Analysis-20240125.pdfSource snippet
About the PhenomenonUAP performance parameters: including altitude and/or depth, travel path and trajectory, velocity, and maneuverabilit...
-
Source: mdpi.com
Link: https://www.mdpi.com/1424-8220/18/8/2433Source snippet
Multi-Camera Imaging System for UAV Photogrammetryby D Wierzbicki · 2018 · Cited by 86 — In addition, the use of a multi-camera syste...
-
Source: reddit.com
Title: This report remains unresolved due to lack of technical data.Read more
Link: https://www.reddit.com/r/UFOs/comments/1ko9q2o/aaro_has_posted_another_unresolved_case_video/Source snippet
AARO has posted another unresolved case (video): "This...May 16, 2025 — This footage, captured by an infrared sensor in 2024, was...
Published: May 16, 2025
-
Source: arxiv.org
Link: https://arxiv.org/abs/2305.18566Source snippet
The Scientific Investigation of Unidentified Aerial Phenomena (UAP) Using Multimodal Ground-Based ObservatoriesMay 29, 2023...
Published: May 29, 2023
-
Source: nasa.gov
Title: to release discuss unidentified anomalous phenomena report
Link: https://www.nasa.gov/news-release/nasa-to-release-discuss-unidentified-anomalous-phenomena-report/Source snippet
NASA to Release, Discuss Unidentified Anomalous...12 Sept 2023 — NASA commissioned the study to examine UAP from a scientific perspectiv...
-
Source: science.nasa.gov
Link: https://science.nasa.gov/uap/Source snippet
nasa.govUAP9 Jun 2022 — A study team to examine unidentified anomalous phenomena (UAPs) – that is, observations of events in the sky that...
-
Source: reddit.com
Link: https://www.reddit.com/r/UFOs/comments/1tbulu2/i_went_through_the_new_uap_files_release_a_lot_of/Source snippet
lly new, or whether they are older FBI/NASA/public-domain materials...Read more...
-
Source: reddit.com
Link: https://www.reddit.com/r/UFOs/comments/1gvanut/puerto_rico_case_splits_into_two_why_does_aaro/Source snippet
Puerto Rico case splits into two. Why does AARO not talk...AARO has posted another unresolved case (video): "This footage, captured by a...
-
Source: reddit.com
Link: https://www.reddit.com/r/UFOs/comments/166dk0u/according_to_aaros_new_website_the_flir_gimbal/Source snippet
According to AARO's new website, the FLIR, Gimbal and...According to AARO, the FLIR (Tic Tac UAP), Gimbal, and GoFast videos are “unreso...
-
Source: aaro.mil
Link: https://www.aaro.mil/UAP-Cases/Official-UAP-Imagery/Source snippet
UAP ImageryAARO employed full-motion video analysis and pixel examination techniques to inform its assessment.... UAP Video: Atmospheric...
-
Source: arxiv.org
Link: https://arxiv.org/html/2510.20794v1Source snippet
[Radar]({{ 'radar/' | relative_url }})-Camera Fused Multi-Object Tracking23 Oct 2025 — This paper presents a Multi-Object Tracking (MOT) framework that fuses radar and ca...
-
Source: arxiv.org
Link: https://arxiv.org/pdf/2305.18566Source snippet
The Scienti¯c Investigation of Unidenti¯ed Aerial...by WA Watters · 2023 · Cited by 43 — The fact that many UAP incidents have been hoax...
-
Source: pwkinternational.com
Title: UAP | Unidentified Anomaly or Demand Signal?
Link: https://pwkinternational.com/2025/11/11/uap-unidentified-anomaly-or-demand-signal/Source snippet
11 Nov 2025 — In this report, we map the defense-industry procurement noise, program risk, reputational exposure, near-term markets, (se...
Additional References
-
Source: x.com
Link: https://x.com/DoD_AARO/status/2020991076606280181Source snippet
X (formerly Twitter)The Tic Tac Case Solved: AARO Gremlin System Provides...AARO concludes that witness accounts, when evaluated against...
-
Source: researchgate.net
Link: https://www.researchgate.net/publication/319414797_INVESTIGATION_OF_PARALLAX_ISSUES_FOR_MULTI-LENS_MULTISPECTRAL_CAMERA_BAND_CO-REGISTRATIONSource snippet
investigation of parallax issues for multi-lens multispectral...3 Mar 2026 — The original multispectral (MS) images obtained from multi...
-
Source: ez-pdh.com
Link: https://ez-pdh.com/aerial-photogrammetry-help/Source snippet
Aerial Photogrammetry HelpThe purpose of this section is to [review]({{ 'review/' | relative_url }}) the basic geometry of aerial photography and the elements of photogram...
-
Source: x.com
Link: https://x.com/DoD_AAROSource snippet
Parody of the All-Domain Anomaly Resolution OfficeAmbiguity in the data led to widespread misinterpretation. AARO emphasizes that ambigui...
-
Source: medium.com
Link: https://medium.com/%40kyeq1/threat-first-or-contact-first-the-human-choice-hidden-inside-uap-disclosure-79c83c19b00fSource snippet
Threat First or Contact First? The Human Choice Hidden...AARO's public mission language reflects this posture: it frames UAP work as a d...
-
Source: primitiveproton.com
Link: https://primitiveproton.com/unidentified-anomalous-phenomena-uap/ -
Source: avi-loeb.medium.com
Link: https://avi-loeb.medium.com/high-quality-data-is-worth-a-thousand-llms-in-resolving-ambiguities-about-ufos-dab9bc74c7c0Source snippet
medium.comHigh-Quality Data is Worth a Thousand LLMs in Resolving...High-Quality Data is Worth a Thousand LLMs in Resolving Ambiguities...
-
Source: youtube.com
Link: https://www.youtube.com/watch?v=TQcqOW39kskSource snippet
Unidentified Anomalous Phenomena Independent Study ReportNASA commissioned an independent study team to examine unidentified anomalous ph...
-
Source: researchgate.net
Title: 377844698 Investigating UAP Events Using Astronomical Techniques
Link: https://www.researchgate.net/publication/377844698_Investigating_UAP_Events_Using_Astronomical_TechniquesSource snippet
Investigating UAP Events Using Astronomical Techniques31 Jan 2024 — The most important measurements for the scientific investigation of U...
-
Source: leonarddavid.com
Title: nasa report released unidentified anomalous phenomena uap
Link: https://www.leonarddavid.com/nasa-report-released-unidentified-anomalous-phenomena-uap/Source snippet
Unidentified Anomalous Phenomena (UAP) – UPDATED14 Sept 2023 — NASA has released its Unidentified Anomalous Phenomena (UAP) report comple...
Topic Tree