iceberg
Enable an AI agent to recognise and track an individual iceberg, assess its changing physical state and hazards, and determine which observations or interventions are justified.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex
Purpose and description
Enable an AI agent to recognise and track an individual iceberg, assess its changing physical state and hazards, and determine which observations or interventions are justified.
It can be Recognise or provisionally classify an ice body using origin, detachment and size evidence.; Associate new sightings with the iceberg and maintain a track with explicit uncertainty.; Request remote, surface or underwater observations to resolve decision-critical gaps.; Estimate future occupied areas and possible encounters using linked environmental information.; Recommend avoidance, monitoring or operational restrictions using current evidence and applicable procedures.; Assess whether a proposed tow, deflection, sampling or other intervention has sufficient evidence and authorization to proceed..
Distinguishing features
Establish land-ice origin using direct evidence or a qualified interpretation; a body formed by freezing surrounding seawater belongs to the sea-ice model.
Establish detachment from a glacier or ice shelf; an attached projecting ice front is not yet an individual iceberg.
Apply an explicitly named size convention to distinguish an iceberg from a bergy bit, growler or other fragment; preserve an uncertain classification when dimensions are unresolved.
Distinguish one coherent ice body from a cluster of separate bodies or an unresolved radar return before assigning individual identity.
Distinguish grounding from continued attachment to land ice; contact with the seabed does not by itself establish glacier membership.
Scope
+ Evidence that the body is detached land-origin ice and qualifies as an iceberg under the selected convention
+ Above-water and submerged geometry, with observation times and uncertainty
+ Position, drift, orientation and floating or grounded state
+ Fracture, melting, rollover and fragmentation as changes to the tracked body
+ Iceberg-specific hazards and conditions governing observation, avoidance or intervention
- The parent glacier or ice shelf as a continuing ice system
- Sea ice, ice floes and regional sea-ice cover
- Ocean currents, weather and bathymetry as independently maintained environmental models
- Vessels, offshore installations and their general operating procedures
- Regional iceberg populations, climatology and ice-service forecasting systems
- Ownership, permitting and commercial ice-harvesting operations beyond their constraints on this iceberg
Characteristics
- Land-ice origin
- confirmed land-origin ice | probable land-origin ice | unresolved Controls whether the iceberg model applies and prevents confusion with sea ice.
- Parent ice body
- identified glacier or ice shelf, supporting evidence, or unknown Supports provenance without treating proximity as proof of origin.
- Size and shape classification
- class labels under a named convention and version, or unclassified Makes recognition and reporting consistent while keeping category boundaries explicit.
- Position and observation time
- latitude and longitude in a stated reference system; timestamp; horizontal uncertainty in m Locates a moving body and exposes when an observation is too old for a decision.
- Exposed dimensions
- length, width and maximum freeboard in m relative to stated axes and water level Supports classification, recognition and assessment of the visible obstruction.
- Submerged extent
- draft in m and underwater envelope; method, uncertainty and unresolved areas Supports underwater clearance assessment without substituting visible dimensions for measured submerged geometry.
- Drift and rotation
- speed in m/s, direction in degrees and angular rate in degrees/hour; reference frame and interval Supports encounter prediction and reveals changes that invalidate an earlier track.
- Support state
- floating | grounded | intermittently grounded | unresolved Changes how movement, seabed interaction and possible release should be assessed.
- Structural condition
- observed cracks, overhangs, cavities, fragment shedding and recent orientation changes; unknown where unobserved Records evidence relevant to deterioration and instability without claiming a certain failure time.
- Track and fragment lineage
- prior observations, predecessor body and resulting fragments, with association confidence Preserves continuity through changing appearance, incomplete sightings and breakup.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.iceberg
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 10 layers · 10 findings · 20 questions.
Iceberg recognition and lineage Establishes what the ice body is and how its identity persists across observations and breakup.
A tracked iceberg must be distinguished from sea ice, attached land ice and other fragments before observations or decisions can be attributed to it.
Origin and classification
Records the evidence supporting land-ice origin, detachment and the chosen iceberg category.
Iceberg membership evidence
The agent must record a supported or provisional classification, including the convention used and evidence still missing.
- What evidence establishes that this is detached land-origin ice rather than sea ice or an attached ice front? definition
- Under which size convention does this body qualify as an iceberg, and could measurement uncertainty place it in a neighbouring fragment class? boundary
Sighting and fragment continuity
Connects observations and resulting fragments without assuming that a changing outline implies a new body.
Identity through change
The agent must distinguish supported track continuity from uncertain association and explicitly record breakup lineage.
- Which position history, shape features or other observations support associating this sighting with the existing iceberg? provenance
- After fragmentation, which body, if any, retains the previous identity, and which bodies require linked successor identities? boundary
Exposed and submerged form Describes the iceberg's visible form and underwater obstruction as separate, time-dependent evidence.
Recognition can rely on exposed shape, while clearance and grounding decisions require information about portions that may not be visible.
Exposed form
Records dimensions and distinctive features above the contemporaneous water surface.
Visible envelope
The agent must record observed exposed dimensions and outline without presenting an incomplete viewing angle as a complete survey.
- What length, width, freeboard and distinctive shape features were observed, at what time and relative to which water level? measurement
- Which faces or edges were obscured, and how does that limit the reported dimensions and shape classification? boundary
Underwater form
Records the submerged envelope and distinguishes direct observations from inferred geometry.
Draft and submerged projections
The agent must preserve the method and uncertainty of draft estimates and identify underwater areas that remain unresolved.
- What draft and lateral submerged extent are supported by observations, and what uncertainty accompanies each estimate? measurement
- Where geometry is inferred from exposed form, what assumptions were used and what independent evidence supports them? provenance
Drift, grounding and encounters Tracks movement and seabed contact and relates the iceberg's possible future position to nearby operations.
An iceberg's significance depends on where its full envelope may move, whether it is constrained by grounding and what occupies the same water.
Motion and support
Separates measured drift and rotation from interpretations of floating or grounded state.
Observed motion and grounding
The agent must record motion over a stated interval and the evidence for any grounding assessment.
- What translation and rotation are supported by successive observations, including their time intervals and positional uncertainty? measurement
- What evidence distinguishes grounding from slow drift, and which water-level or seabed uncertainties could change that assessment? boundary
Future occupied water
Relates forecast movement and the iceberg's dimensions to potential encounters.
Encounter envelope
The agent must express future occupancy as a conditional estimate with an expiry and identify possible conflicts with linked vessels or structures.
- What area could the iceberg occupy over the decision horizon, given track uncertainty, submerged extent and the environmental forecast used? measurement
- Which possible encounters require a warning, route change or renewed observation under the applicable operating procedure? action
Deterioration and instability Records changes to the ice body and evidence relevant to fracture, shedding and rollover.
A previous outline or condition assessment can become invalid as the body deteriorates or changes orientation.
Ice loss and damage
Tracks observed loss of ice and changes to cracks, cavities and overhangs.
Documented deterioration
The agent must separate observed changes from inferred deterioration mechanisms and account for differing observation conditions.
- What changes in dimensions, cracks, cavities or fragment shedding are supported by comparable observations? measurement
- What evidence supports attributing the change to melting, fracture or another process rather than viewpoint or measurement differences? provenance
Rollover and breakup
Records evidence of instability and events that invalidate prior geometry or tracking assumptions.
Instability evidence and reassessment
The agent must record observed or suspected rollover and breakup while preserving uncertainty about future occurrence.
- What observations support a recent rollover, ongoing breakup or concern about instability, and what remains unresolved? measurement
- Which geometry estimates, track associations and nearby-operation decisions must be reassessed after the event? action
Observation and intervention Connects iceberg-specific evidence gaps and hazards to monitoring, approach and physical intervention decisions.
Recording an iceberg should support justified action without turning uncertain geometry or condition into assumed permission to approach or manipulate it.
Observation sufficiency
Assesses whether available observations are adequate and recent enough for the proposed decision.
Decision-critical observation gaps
The agent must identify missing evidence about the iceberg and select observations that can resolve it within the operational time window.
- Which uncertainty about submerged extent, drift, grounding or structural condition currently limits the decision? measurement
- Which observation method and revisit interval can resolve that uncertainty while accounting for iceberg movement and possible shedding or rollover? action
Approach and physical intervention
Records the evidence, authority and stopping conditions for operations near or on the iceberg.
Intervention conditions
The agent must assess a specific proposed action against current iceberg evidence, linked operational capabilities and applicable authorization.
- For the proposed approach, sampling, tow or deflection, what evidence supports feasibility and what authorization or operating limits apply? action
- Which changes in drift, cracking, shedding, orientation or grounding require the action to stop and the assessment to be renewed? action
What the second pass must settle
- Which authoritative classification convention should govern iceberg, bergy-bit and growler boundaries, including treatment of freshwater settings?
- What minimum evidence should support land-ice origin when neither the calving event nor the parent glacier or ice shelf is known?
- Which methods can estimate submerged geometry adequately for each intended decision, and how should their uncertainty be represented?
- What identity-continuity rule should apply after substantial fragmentation, rollover or a prolonged tracking gap?
- Which validated criteria and jurisdiction-specific procedures should govern observation freshness, approach limits and physical intervention?