---
analysis-role: guide
analysis-category: guide
confidence-level: medium
confidence-rationale: Five raw samples show a persistent compact black-hot return against textured terrain, but the video lacks range, platform motion, and calibrated sensor telemetry.
evidence-status: verified-source
ai-analysis: true
accuracy-disclaimer: AI-assisted frame analysis; timestamps and image-plane interpretation may contain errors. Verify against the cited raw video and source-frame sheet.
ai-generated: true
companion-eligible: true
topic-slug: pr136-terrain-track
topic-title: PR136 Terrain-Registered Thermal Track
topic-description: Primary Release 5 representative sequence showing a compact black-hot return persisting against mountain terrain from 11 to 23 seconds.
guide-description: Adjacent-frame analysis of PR136 with raw full-frame and fixed-geometry review sheets.
topic-audience: serious-uap-readers
topic-priority: 9
---

# PR136 Terrain-Registered Thermal Track

## Source Basis

Source: [DOW PR136 / DOD_111887413](/?open=Release_5%2FDOD_111887413.mp4). Samples: [11.000s](/?open=Release_5%2FDOD_111887413.mp4&t=11), [14.000s](/?open=Release_5%2FDOD_111887413.mp4&t=14), [17.000s](/?open=Release_5%2FDOD_111887413.mp4&t=17), [20.000s](/?open=Release_5%2FDOD_111887413.mp4&t=20), and [23.000s](/?open=Release_5%2FDOD_111887413.mp4&t=23).

![PR136 raw source-frame contact sheet](/media/Release_5/Analysis/images/c106-pr136-terrain-track-source-frame-contact-sheet.png)

## Observation

The compact dark return is independently visible in all five raw samples while ridges, slopes, and drainage features remain visible around it. Its image position changes as the sensor view changes. That establishes a persistent image-plane contact across the sampled twelve-second interval.

The source does not establish a stable hull outline. The return occupies only a small pixel area, varies from compact dot to slightly elongated blob, and is sometimes accompanied by colored tracking/detection overlays. Terrain registration improves continuity analysis, but does not supply range: the contact can be in front of, over, or beyond the apparent surface.

![PR136 crop geometry review](/media/Release_5/Analysis/images/c106-pr136-terrain-track-geometry-review.png)

The fixed crop shows why absolute motion cannot be read directly from reticle separation. Both target and terrain shift as the sensor points or stabilizes. No platform attitude, gimbal angles, slant range, or field-of-view telemetry is supplied.

No enhanced image is used for the finding. The raw samples and fixed geometry control the assessment; fine shape remains non-diagnostic.

## Hypotheses and Controls

| Lane | Source fit | Limitation |
| --- | --- | --- |
| Physical airborne object | Persistent compact return survives against changing textured terrain | Range, altitude, speed, and dimensions are unknown |
| Aircraft/drone/bird | A small moving thermal contrast can produce the observed track | Pixels do not resolve wings, rotor, or species cues |
| Balloon/debris | Passive objects can persist while platform motion creates apparent travel | Wind and range data are absent |
| Sensor/track artifact | Overlays and small-pixel morphology affect apparent position and shape | Return remains visible outside colored overlay states, so pure overlay is incomplete |

## Working Assessment

Medium confidence: PR136 is Release 5's strongest representative sequence because it supports persistence against a structured background. The conclusion is “compact terrain-registered thermal contact,” not “measured high-speed craft.” A calibrated trajectory requires native telemetry and platform-motion compensation.