- AIS correlation and dark-ship detection — Cross-referencing SAR-detected vessel positions against spaceborne AIS records exposes ships that have gone deliberately dark. This page explains the physics, the method, and the honest limits of each data layer.
- Anchorage dwell-time analysis for commodity flow intelligence — How long a named ship sits in a roadstead reveals loading rates, demand shocks, and supply-chain stress before any price feed catches up. This page explains the sensors, methods, and honest limits of satellite-derived dwell-time analysis.
- Crude oil tanker load-status estimation from freeboard — High-resolution optical and SAR imagery can reveal whether a crude oil tanker is carrying cargo or running empty by measuring the strip of hull visible above the waterline. The method combines known vessel dimensions from public registries with photogrammetric shadow analysis.
- Floating storage tanker inventory tracking for oil markets — Extended anchorage dwell times combined with laden freeboard signatures let satellite analysts estimate crude oil volumes held off-market in floating storage. Aggregated globally, the metric is an independent leading indicator for supply dynamics that no price feed or shipping report can replicate.
- GNSS spoofing anomaly detection for vessel position integrity — AIS-broadcast positions can be fabricated or spoofed at the transmitter. Cross-referencing them against SAR detections, spaceborne AIS, and GNSS-RO data exposes discrepancies that self-reported transponders cannot hide.
- IUU fishing detection inside exclusive economic zones — Combining SAR dark-vessel detection with spaceborne AIS and VIIRS night-light data lets coastal states identify fishing activity inside their EEZs that never appears in official catch records. Each method has hard limits; used together, they narrow the ambiguity considerably.
- Naval vessel monitoring in foreign ports and anchorages — High-resolution optical and SAR satellites can identify individual naval vessels by hull class, pennant number, and equipment configuration. This page explains what is detectable, at what resolution, and where the method breaks down.
- Oil slick and illegal bilge-dump detection using SAR — Synthetic aperture radar detects oil on the sea surface by the way it kills capillary waves, creating a dark patch against surrounding rougher water. This page explains the physics, the false-alarm problem, and how Sentinel-1 makes coastal enforcement operationally viable.
- Optical vessel classification by hull type — Very-high-resolution optical satellites can distinguish tankers from bulk carriers, container ships, fishing vessels, and naval craft by hull geometry and deck profile. Classification accuracy depends critically on achieving sub-1-metre ground sampling distance and clear skies.
- Port congestion measurement from anchorage vessel queues — Repeat-pass optical and SAR imagery provides an independent physical count of vessels queuing at anchor outside major ports, giving a congestion signal that leads official throughput statistics by days to weeks.
- RF emissions fingerprinting of vessels at sea — Signals-intelligence satellites in LEO detect and geolocate non-AIS radio-frequency emissions from vessels, exposing ships that deliberately hide. This page explains the physics, the geolocation maths, and the honest limits of the method.
- SAR Doppler anomaly measurement for vessel velocity — Synthetic aperture radar encodes a moving vessel's radial velocity as a measurable image displacement. This page explains the physics, the geometry, the numbers, and where the method breaks down.
- SAR-based vessel detection in open ocean — Synthetic aperture radar detects metal hulls at sea regardless of cloud cover or darkness, using backscatter physics that no vessel operator can suppress. This page explains how CFAR algorithms, sensor geometry, and sea-state interact to determine what gets found and what does not.
- Sea-lane traffic density mapping from multi-source detections — Aggregating spaceborne AIS and SAR detections over weeks or months reveals route-level traffic density, vessel-type mix, and seasonal shifts that no single-pass product can show. AIS-only maps systematically undercount traffic where transponder use is low or deliberately suppressed.
- Satellite support for search and rescue drift prediction — When a vessel or person goes missing at sea, drift models define the search area. Satellite-derived currents, wind fields, wave height, and spaceborne AIS last-known-position data can sharpen those models and then directly image the probability zones.
- Ship-to-ship transfer monitoring for sanctions evasion — Ship-to-ship transfers obscure cargo origin by moving oil between vessels beyond port jurisdiction. SAR imagery and spaceborne AIS together expose the rendezvous that AIS manipulation tries to hide.
- Submarine snorkel mast and periscope detection using SAR — High-resolution spotlight SAR can detect the faint radar returns of submarine snorkel masts and periscopes, but sea clutter at moderate sea states makes discrimination genuinely hard. This page explains the physics, the processing chain, and the honest limits of what satellite SAR can and cannot do.
- Vessel-to-vessel proximity event logging for insurance and liability — Spaceborne AIS and SAR together produce an auditable log of close-approach events between vessels, giving insurers and liability investigators a time-stamped, position-referenced record that shore-based systems routinely miss.
- Vessel wake analysis for speed and heading reconstruction — High-resolution SAR and optical imagery preserve the geometry of a vessel's Kelvin wake long after the ship has moved on, allowing analysts to reconstruct speed, heading, and manoeuvre history independent of AIS. Resolution better than 3 m GSD is the practical threshold for reliable extraction.
- Night-light detection of squid and light-luring fishing fleets — VIIRS Day-Night Band imagery locates squid and light-luring fishing fleets at night by detecting their high-intensity lamps from low Earth orbit, exposing fleets that routinely disable AIS and evade SAR during calm conditions.