How does a satellite actually measure how much oil is in a tank?

Most above-ground crude tanks use a floating roof that rises and falls with the liquid level. An optical or SAR satellite images the shadow cast by the roof wall onto the liquid surface; the shadow width is a direct proxy for roof height and therefore fill level. Analysts convert shadow measurements into volume using known tank diameters from cadastral or commercial databases. Fixed-roof tanks require indirect inference from thermal signatures, vehicle movements, or pipeline flow data.

Why shouldn't a country just buy this data from Planet, ICEYE, or Orbital Insight?

Commercial providers can revoke access, throttle revisit, apply 'shutter control' under their home government's orders, or simply reprioritise tasking toward higher-paying customers during a crisis — precisely when accurate inventory data is most critical for national energy security decisions. A sovereign constellation keeps the imaging schedule, analytic pipeline, and raw data entirely under national control and cannot be switched off by a foreign regulator or board decision.

What orbit is best for oil storage monitoring?

Low Earth orbit (450–550 km sun-synchronous) is the standard choice. It delivers the ground-sample distances needed for shadow detection (0.5–1 m for optical, 1–3 m for SAR), keeps revisit latency manageable with a 12–20 satellite constellation, and avoids the power and cost penalties of higher orbits. GEO offers continuous stare but cannot achieve the resolution required for individual tank measurement with any economically feasible aperture.

Can SAR see through clouds where optical satellites cannot?

Yes — synthetic aperture radar is weather-independent and operates day or night, making it the backbone of any resilient inventory-monitoring architecture. SAR can detect roof position and, with repeat-pass interferometry, measure millimetre-scale changes in tank surface height. The trade-off is higher processing complexity, the need for precise orbit knowledge, and the ITU coordination burden for active microwave emissions in the 9.6 GHz or 5.4 GHz bands.

How accurate is satellite-derived inventory compared to physical gauging?

Studies comparing satellite shadow analysis with reported stock levels — including Planet Labs' 2022 benchmark — show correlations of roughly 90–93% for large floating-roof tanks in favourable conditions. Accuracy degrades for smaller tanks (below ~20 m diameter), partially obscured roofs, or during low-sun-angle seasons. Physical custody-transfer gauging under ISO 4512 remains the legal standard for commercial transactions; satellite data is a strategic and macro-level intelligence tool, not a custody-transfer substitute.

What is the 'dark fleet' and how does satellite inventory tracking help counter it?

The 'dark fleet' refers to tankers that disable AIS transponders to obscure the origin or destination of sanctioned crude. Satellite-based ship-detection (SAR and optical) can identify dark vessels at sea, while storage-terminal monitoring cross-checks discharge volumes against reported imports. Fusing both layers lets a sovereign government or regulator detect discrepancies between what arrived at a terminal and what was officially declared — a powerful sanctions-enforcement and revenue-protection tool.

What domestic capabilities does a nation need beyond the satellites themselves?

A fully sovereign pipeline requires: a ground station or secure downlink arrangement, an image processing facility with SAR and optical processing chains, a tank-detection model trained on national inventory geometry, a secure database linking satellite-derived volumes to fiscal and customs records, and an analysis team capable of interpreting anomalies. Most nations partner with their national mapping agency (equivalent of USGS or a national cadastre) to supply the baseline tank geometry database.

How long does it take to build and launch a minimal viable constellation for this application?

A 4–6 microsatellite constellation using commercially available SAR or optical payloads in the 50–150 kg class can realistically go from programme approval to on-orbit operations in 36–48 months, based on programmes like ICEYE's government partnerships and ESA's Earth Observation Fast Track initiatives. This provides roughly 12-hour revisit at key latitudes — sufficient for strategic intelligence though not real-time monitoring. A 12–20 satellite full constellation requires 5–7 years and materially greater capital.

11.1.2Live

Inventory & Storage Tracking

Workers in hard hats walking between large cylindrical oil storage tanks at an industrial facility — Nighttime aerial view of a tank farm where satellite radar now enables precise, remote monitoring of fuel storage levels.

Satellite Radar Monitors Oil Tank Fill Levels

1
SAR Satellite
Synthetic aperture radar images tank rooftops
2
Downlink
Raw radar data relayed to ground station
3
Analytics Platform
AI detects floating roof position, calculates volume
4
Operations Dashboard
Real-time inventory alerts for traders and operators

Radar satellites measure tank roof displacement daily, giving operators precise stock volume without manual gauging or site visits.

Page in the build queue

This application has its place in the atlas. The full page — short and long descriptions, what-matters bullets, sovereignty rationale, and the eight-field architecture block — is being written next.

Maturity reading: Operational systems exist with paying customers. Phase 1 built §4.1 (Maritime Intelligence) end-to-end as the depth-and-format reference. Section 4 is the next section to graduate from scaffold to full content; the rest follow on the roadmap.

Related applications

11.1.1 · Previous

Upstream Asset Monitoring

All in oil & gas intelligence

11.1.3 · Next

Refinery Throughput Estimation

Bring this into your sovereign programme.

All solutions Speak with engineering