Emissions monitoring and carbon MRV

A sovereign MRV capability replaces unauditable national inventories with instrument-grade measurements of methane, flaring and forest carbon, giving regulators and carbon markets a number they can defend.

The dependence this ends: Self-reported inventories nobody can audit

The credibility problem with national inventories

Every country that has signed the Paris Agreement submits a national greenhouse-gas inventory. Those inventories are compiled from activity data: fuel sales figures, livestock counts, land-use records, industrial production logs. The numbers are then multiplied by emission factors derived from laboratory studies, often decades old, often from a different country's industry. The result is a figure that is internally consistent and almost impossible to verify from the outside.

That is not a political observation. It is a measurement one. The IPCC itself acknowledges that bottom-up inventory methods carry structural uncertainties of thirty to fifty per cent for methane in oil and gas sectors, and wider still for land-use change. Carbon markets have begun to price this uncertainty in: voluntary credits from forest-carbon projects have faced sustained credibility challenges precisely because the baseline and additionality claims rest on modelled, not measured, carbon stocks. A government that can present instrument-derived measurements, traceable to a national satellite asset, is selling something categorically different from a spreadsheet.

What physics can and cannot see

Three sensor types do the work, and each has honest limits worth stating before procurement.

Shortwave infrared spectrometers, operating in the 1.6 and 2.3 micrometre methane absorption bands, detect column-averaged methane concentrations above a scene. Missions such as ESA's Sentinel-5P (TROPOMI instrument) demonstrate detection of large point sources above roughly 500 kg per hour at 5.5 km pixel resolution. Smaller sources are below the noise floor at that resolution. Dedicated small-satellite spectrometers with tighter ground sampling, such as the GHGSat commercial series, push detection thresholds down to around 10 to 25 kg per hour for individual facility-level plumes, but their swath narrows correspondingly. You gain sensitivity by giving up coverage. A sovereign programme must choose where on that trade-off curve it sits, and that choice should be driven by the industrial geography of the country, not by what a vendor happens to build.

Thermal infrared imagers quantify flaring by measuring radiant heat from combustion. The method is well established: VIIRS nightfire and similar algorithms have been used to produce global flaring estimates for over a decade. The limit is that small, intermittent flares, those burning for minutes rather than hours, are easily missed on a once-daily overpass. Revisit frequency is not a marketing variable; it is a detection-probability variable.

Hyperspectral imagers in the visible-to-shortwave range map forest canopy composition and health, which feeds above-ground biomass estimation. They do not directly measure carbon. They measure reflectance spectra that correlate with canopy properties, and those correlations require ground-truth calibration in each forest type. Cloud cover over tropical forests, which is where most contested forest carbon sits, can reduce usable observations to a fraction of scheduled passes. A realistic sovereign forest-MRV programme plans for this and combines satellite passes with SAR data from partner constellations or commercial tasking.

The ambition ladder: from pathfinder to operational constellation

A pathfinder mission, one or two satellites, establishes the national measurement baseline and demonstrates regulatory credibility. At this scale the satellite carries a shortwave infrared spectrometer and, optionally, a thermal infrared channel for flaring. Orbit is sun-synchronous, typically 500 to 600 km, chosen to balance atmospheric path length against ground resolution. A single ground station handles downlink. The national team operates the mission under supervision. Publicly reported small-satellite science and monitoring missions of broadly this class have carried budgets in the low tens of millions of dollars, though sensor complexity and ground-segment ambition move that figure significantly. The pathfinder produces data; it does not yet produce a defensible national inventory on its own.

An operational constellation adds satellites to close the revisit gap. Two to four satellites in the same orbital plane, or spread across multiple planes, can achieve daily or near-daily coverage of priority industrial zones. This is the configuration that supports regulatory enforcement: an operator cannot claim an anomalous flaring event was brief if the satellite passed overhead three times in forty-eight hours. At constellation scale, in-country processing becomes non-negotiable. Raw spectra processed abroad are data that have left the jurisdiction; processed emission estimates are intelligence that stays in it.

Full sovereign programme status means the country holds the calibration records, the algorithm source code, the ground-station infrastructure and the trained analysts. It can publish a national methane inventory that international reviewers can interrogate at the instrument level. That is the asset that commands a premium in carbon markets and in diplomatic settings where inventory credibility is contested.

What the customer owns and what remains uncertain

At handover, the customer holds the satellite bus and payload, the ground station and mission-control software under source-access terms, the calibration database built during commissioning, the processing pipeline and its documentation, and a trained national operations team. Satellize's role after handover is defined at contract signature: it may include a support retainer, but the sovereign intent is that the country can operate, re-task and re-calibrate the system without asking permission.

What the satellite cannot do should be stated plainly. It cannot detect every source. Small, diffuse emissions from agriculture or distributed urban sources are below the detection floor of any current spaceborne spectrometer at national scale. It cannot see through persistent cloud on a given pass. It cannot produce a carbon credit by itself: the measurement feeds a methodology, and that methodology must be validated against an accepted standard such as those maintained by the UNFCCC or a recognised voluntary carbon standard body. The satellite is the evidence layer. The regulatory and market infrastructure that acts on that evidence is built separately.

Why sovereign beats subscribed for this application

Commercial methane-monitoring services exist. Several offer national-scale data products on subscription. The problem is not data quality. The problem is provenance and control. A regulator issuing an enforcement notice against a major industrial operator on the basis of data purchased from a foreign commercial provider will face immediate legal challenge on chain-of-custody grounds. Who holds the raw instrument data? Under what jurisdiction? Can the algorithm be audited in court? These are not hypothetical objections; they are the first questions any competent industrial lawyer will raise.

A national satellite, with calibration records held by the national meteorological or space agency, with processing done in-country on government infrastructure, produces evidence with a defensible chain of custody. That is what makes the difference between a monitoring programme and an enforcement capability. The Satellize model, source-access terms agreed before signature and hardware audit rights written into the contract, is structured specifically to support that chain of custody. The Tonga crop-estimation programme demonstrated the same principle at smaller scale: the analytical output is only as credible as the sovereignty of the data pipeline that produced it.

What this mission is built from

Atmospheric sounders and gas spectrometers: Provides the shortwave infrared spectrometry that measures column methane concentrations and identifies point-source plumes above the detection threshold.
Hyperspectral imagers: Maps forest canopy composition and health to support above-ground biomass estimation and forest-carbon baseline verification.
Thermal infrared imagers: Quantifies gas flaring by measuring combustion radiance, enabling comparison against operator-reported flaring volumes.
In-country data processing: Keeps raw spectra and derived emission estimates within national jurisdiction, preserving the chain of custody required for regulatory enforcement.

What you end up owning

Satellite bus and payload hardware, with full documentation and calibration records
Ground station infrastructure and mission-control software under source-access licence
Calibration database established during commissioning and updated through operations
Emission-quantification processing pipeline with auditable algorithm source code
Trained national team of satellite operators and data analysts
National methane and flaring measurement archive, stored on in-country infrastructure
Contractual hardware audit rights and rights to independent third-party verification of the system

Handover is staged across the operational period: the national team shadows Satellize engineers from commissioning, assumes primary operations responsibility at a defined milestone, and holds full independent authority by contract end. Satellize retains no ongoing data access rights after handover unless a support retainer is separately contracted. Algorithm updates and recalibration methodology are documented and transferred as part of the programme close-out, not held as proprietary.

Programme parameters

Pathfinder configuration	1 to 2 satellites, sun-synchronous orbit at 500 to 600 km, shortwave infrared spectrometer primary payload
Operational constellation	2 to 4 satellites, single or multiple orbital planes, matched to national industrial geography
Methane detection floor (point source)	Approximately 500 kg/hour at 5 km resolution (TROPOMI class); 10 to 25 kg/hour at dedicated small-satellite resolution, narrower swath
Revisit (pathfinder)	1 to 3 days for a given target at mid-latitudes; reduced by cloud cover over tropical regions
Revisit (constellation)	Daily to sub-daily coverage of priority industrial zones with 3 to 4 satellites
Ground segment	1 primary ground station in-country; optional redundant station; in-country processing node
National operations team	Typically 4 to 8 trained operators and analysts at full handover; exact number depends on constellation size
Programme timeline (pathfinder to handover)	36 to 54 months from contract signature, depending on payload complexity and launch slot availability
Cost class reference	Small-satellite monitoring missions of this sensor class have publicly reported budgets in the low to mid tens of millions of dollars; constellation scale is proportionally higher

Sources

One contract, one accountable engineer

Commissioned as one programme, not a stack of contracts: spacecraft, launch, ground segment, mission control, training and handover are priced together. Source-access terms and audit rights are agreed in writing before signature. Request a sensor-trade briefing for your basin.