Landfills are among the most significant sources of fugitive methane emissions in Europe, yet they have historically been among the hardest sites to monitor effectively. As regulatory pressure intensifies and the EU Methane Regulation 2024/1787 sets clear obligations for operators, the question of how to survey a landfill is no longer just a technical one — it is a compliance one. That shift has brought drone-based gas detection and landfill methane detection methods into sharp focus, prompting operators to weigh modern airborne approaches against the traditional ground-level surveys they have relied on for decades.
The contrast between these two approaches is striking. Traditional methods were designed for a different era of environmental oversight, while airborne and drone-based technologies have been built specifically to meet the demands of large-area fugitive emissions monitoring. Understanding the real differences between them is essential for any landfill operator planning their LDAR programme in 2026 and beyond.
How traditional landfill surveys fall short
Ground-based landfill survey methods have been the industry standard for many years, and they do offer certain advantages — particularly in pinpointing specific leak locations at close range. However, when it comes to comprehensive site-level methane monitoring, they face serious structural limitations that are difficult to overcome.
The most fundamental problem is coverage. A landfill can span dozens of hectares of uneven, compacted waste, with methane migrating unpredictably through the surface. Ground crews walking transects with handheld detectors can only cover so much ground per day, and the pace of a manual survey means that large portions of a site may go unchecked for extended periods. Wind conditions, surface irregularities, and vegetation cover all introduce gaps in detection. The result is a survey that is labour-intensive, time-consuming, and inherently incomplete.
There is also the issue of quantification. Traditional surveys are well-suited to detecting the presence of a leak, but translating that into a meaningful emission rate — the kind of data now required under EU regulations — is far more difficult with ground-level instruments. Without reliable quantification, operators are left with incomplete data that may not satisfy the reporting obligations they face.
What drone-based detection brings to methane monitoring
Airborne methane detection fundamentally changes the economics and effectiveness of landfill surveys. By moving the sensor platform above the site, it becomes possible to cover large areas quickly, consistently, and with far greater spatial resolution than any ground crew could achieve.
Drone and helicopter-based systems equipped with laser-based sensors can sweep across an entire landfill surface in a fraction of the time required for a manual survey. This speed advantage is not just about efficiency — it also means that surveys can be repeated more frequently, giving operators a dynamic picture of emission patterns rather than a single static snapshot. Seasonal variation, operational changes, and new leak points can all be captured in a way that periodic ground surveys simply cannot match.
Beyond speed, airborne platforms offer a crucial safety benefit. Landfill surfaces can be hazardous to access, with unstable ground, gas venting infrastructure, and restricted zones. Remote sensing from altitude eliminates the need to place personnel in those conditions while still delivering comprehensive coverage across the surface area of the site.
Accuracy and sensitivity: A head-to-head comparison
Sensitivity is where the comparison between detection methods becomes most technically meaningful. The ability to detect very low leak rates under real-world field conditions — variable wind, ambient temperature changes, surface heterogeneity — is what separates a robust LDAR programme from one that merely satisfies a procedural requirement.
Detection thresholds
Advanced airborne DIAL (Differential Absorption LIDAR) systems are capable of detecting leakage rates as low as 150 litres per hour, even at wind speeds up to 24 km/h. This level of sensitivity is difficult to replicate with handheld instruments in open-field conditions, where ambient dilution and turbulence can mask small emissions. Ground-based optical gas imaging cameras can be effective in calm conditions and at close range, but their performance degrades significantly in challenging weather or over large open areas.
Quantification capability
For regulatory compliance, detection alone is not enough. Operators need to quantify emissions at the source and site level, and this is where airborne laser-based systems hold a clear advantage. By measuring methane column concentrations across the full survey area at high spatial resolution, these systems can generate emission flux estimates that meet the requirements of independent third-party verification. Ground-based surveys, by contrast, typically require supplementary modelling or additional instrumentation to produce comparable quantification outputs.
Meeting EU Methane Regulation requirements for landfills
The EU Methane Regulation 2024/1787 has introduced mandatory obligations that directly affect landfill operators. Sites that emit methane must now measure emissions regularly, report them annually, and have those measurements verified by independent third parties. Failure to comply carries severe financial consequences, including fines of up to 20% of annual turnover.
For landfill operators, this means that the choice of survey method is now a compliance decision as much as an operational one. A survey approach that cannot produce verifiable, quantified emission data is not fit for purpose under the new regulatory framework. The regulation specifically requires that operators use methods capable of detecting emissions from underground and surface equipment — a requirement that aligns closely with the capabilities of high-sensitivity airborne systems.
Drone-based and helicopter-based LDAR landfill programmes are well-positioned to meet these obligations because they combine wide-area coverage with the quantification accuracy needed for regulatory reporting. Operators who invest in these approaches now are building a compliance infrastructure that is robust enough to withstand increasing scrutiny as the regulation’s requirements are progressively enforced across the EU.
Choosing the right detection method for your site
No single survey method is universally optimal, and the right choice depends on the specific characteristics of the site, the regulatory obligations in play, and the operational goals of the operator. That said, several practical considerations point clearly toward airborne detection for most modern landfill LDAR programmes.
- Site size: For landfills covering more than a few hectares, ground-based surveys become prohibitively slow and costly to repeat at the frequency now required by regulators. Airborne surveys scale efficiently with site size.
- Emission quantification needs: If the regulatory framework requires site-level emission quantification — as the EU Methane Regulation does — airborne DIAL systems provide the most direct route to compliant data.
- Survey frequency: Regulations increasingly require periodic resurveying rather than one-off assessments. Airborne methods make frequent, repeatable surveys operationally and financially feasible.
- Data integration: Modern airborne systems deliver results via digital platforms, enabling operators to track emission trends over time and integrate findings into their broader environmental reporting workflows.
Ground-based methods retain their value for follow-up investigations once an emission source has been identified from the air, or for detailed inspection of specific infrastructure components. The most effective LDAR programmes typically combine both approaches, using airborne surveys for wide-area detection and quantification, then deploying ground teams to investigate and remediate confirmed leak points.
How ADLARES helps with landfill methane detection
We provide landfill operators with a complete airborne methane detection solution built on our CHARM® DIAL technology — the world’s only DVGW-approved gas remote detection system, with over 250,000 km of gas infrastructure inspected across Europe. Our approach is specifically designed to meet the demands of modern fugitive emissions landfill monitoring and EU Methane Regulation compliance.
- Wide-area surface scanning: Our helicopter-based surveys cover large landfill sites rapidly, detecting leakage rates from 150 l/h at speeds of up to 180 km/h.
- Site-level emission quantification: We deliver the quantified emission data required for independent third-party verification under EU Methane Regulation Type 2 requirements.
- Secure digital reporting: Survey results are delivered via our Web GIS platform, accessible on desktop and mobile, giving operators a clear, actionable view of their site’s emission profile.
- Regulatory-grade precision: Our CHARM® technology is designed to comply with the sensitivity thresholds required for underground and surface equipment under the EU Methane Regulation.
If your landfill site needs a reliable, compliant, and efficient approach to methane monitoring, we are ready to help. Contact our team to discuss how our airborne detection services can be tailored to your site’s specific requirements and regulatory obligations.