Why can't a government just use existing commercial satellites like GHGSat or MethaneSAT instead of building its own?

Commercial operators set their own tasking priorities, cloud-rejection policies, and data-licensing terms — and they are ultimately accountable to their investors, not to the sovereign regulator. A government that owns its constellation decides which basins get daily coverage, retains raw radiance data for independent validation, and cannot be denied access when a commercially sensitive dispute arises. Renting detection capability from the same commercial sector you are trying to regulate is an obvious conflict of interest that erodes enforcement credibility.

What spectral band do operational methane-detection satellites actually use?

The primary channel is the shortwave-infrared SWIR-2 band centred near 2,300 nm (2.3 µm), where methane has strong and distinct absorption features. Secondary validation often uses the SWIR-1 band near 1,650 nm. Both GHGSat and MethaneSAT use SWIR imaging spectrometers; the ESA Sentinel-5P TROPOMI instrument combines UV–visible–NIR–SWIR channels for global column retrievals at ~5.5 km² pixel resolution.

How quickly can a satellite detect and alert authorities to a methane blowout?

With direct-downlink architecture and automated retrieval pipelines, a detection-to-alert latency of under three hours is operationally demonstrated by GHGSat's near-real-time service. However, this requires a clear overpass during the event window. A 12-satellite sovereign constellation in multiple orbital planes could cut mean detection lag to well under 24 hours for most major basins, compared to the 3–7 day revisit typical of a single-plane operator.

What is the difference between a 'plume' detection mission and a 'background' monitoring mission?

Plume-detection missions (GHGSat, Carbon Mapper) use high-spatial-resolution SWIR imagers (≤30 m pixel) to pinpoint individual facility emitters at rates above ~50–100 kg CH₄/hr. Background monitoring missions (TROPOMI, MethaneSAT) use wide-swath spectrometers at coarser resolution (0.5–7 km) to map regional column concentrations and attribute them to source categories. A complete sovereign system pairs both: wide-area sensing flags anomalous basins, high-resolution tasking pinpoints the specific well, compressor, or pipeline segment.

Can these satellites detect methane from routine flaring as well as venting?

Flaring converts methane to CO₂ and water, so a flaring event does not directly appear as a methane plume — but incomplete combustion at flare stacks produces detectable methane slip. Satellites can identify malfunctioning or cold flares by cross-referencing thermal infrared (VIIRS, Landsat-8 OLI) fire radiative power data with SWIR methane columns over the same facility. A sovereign platform that fuses both thermal and SWIR payloads provides far stronger enforcement evidence than a single-mode commercial service.

How do satellites handle the difference between fossil methane and biogenic methane from nearby wetlands or agriculture?

Isotopic discrimination (¹³C/¹²C ratio) is not possible from orbit with current technology. Attribution relies on spatial pattern analysis — oil-and-gas facility plumes are tightly co-located with known infrastructure — combined with temporal correlation (event onset aligning with operational changes) and spectral shape analysis to rule out co-located sources. This is an active research area; forthcoming missions such as the proposed ESA CO2M may carry methane channels that improve regional apportionment.

What are the typical satellite orbit parameters for a methane-monitoring constellation?

Sun-synchronous LEO at 500–600 km altitude is the standard, providing consistent solar illumination angle across the swath — essential for stable SWIR radiance retrievals. An equatorial crossing time of 10:30–13:30 local solar time maximises solar zenith angle performance. Some operators use slightly inclined orbits to improve mid-latitude revisit. GEO platforms are not viable for point-source CH₄ detection at current sensor technology because the signal-to-noise ratio degrades beyond recovery at GEO distances.

How does a sovereign methane constellation feed into Paris Agreement transparency obligations?

Under UNFCCC Decision 18/CMA.1, parties must submit biennial transparency reports including GHG inventory data and methodological consistency. Satellite-derived emission estimates can serve as independent cross-checks on bottom-up national inventories reported to the UNFCCC. Nations owning their own continuous monitoring assets can demonstrate to treaty reviewers that reported inventory figures are validated by independent space-based measurement rather than relying solely on operator self-reporting, which significantly strengthens their transparency credentials.

5.2.1Live

Oil & Gas Methane Plume Detection

Worker in hard hat and safety vest inspecting pipes at an oil and gas facility — Two engineers at an active oil field represent the human workforce increasingly supported by satellites detecting invisible methane emissions overhead.

Satellite Methane Plume Detection Over Oil Fields

1
Hyperspectral Sensor
Detects CH₄ absorption at 1.65 µm wavelength
2
Downlink
Raw spectra transmitted to ground station
3
Plume Retrieval
Algorithms quantify leak rate in kg/hr
4
Operator Alert
Facility owner receives geolocated plume report

Hyperspectral satellites detect and quantify methane plumes at oil and gas sites, delivering actionable leak alerts to operators within hours.

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.

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5.2.2 · Next

Landfill Methane Surveillance

Bring this into your sovereign programme.

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