提出新方法评估甲烷泄漏图像掩码的不确定性，发现同一数据可对应多种合理掩码。
PlumeQuant: Uncertainty-aware consistency assessment of methane plume masks and emission-rate estimates
- 用遗传算法生成多组可能掩码，验证观测值无法唯一确定泄漏边界
- 不同掩码下平均93%的潜在范围未被高置信区域覆盖，弱信号更模糊
- 适用于需核查遥感泄漏数据可靠性的环境监测与政策制定者
成像光谱仪日益发布源解析的甲烷泄漏产品，其中泄漏掩码、积分质量增强（IME）、泄漏长度、排放率及不确定性在物理和算法上相互关联。基于63个EMIT-derived Carbon Mapper泄漏记录（来自27个场景），我们发现这些公开的标量值无法唯一确定泄漏边界：不同但合理的掩码可复现相同的IME、泄漏长度和排放率。以发布的IME和泄漏长度为条件的遗传算法（GA）集合明确揭示了这种等效性：几乎所有目标一致的掩码所覆盖的高置信核心区域仅占潜在足迹范围的中位数13%，且弱信号、低重叠的泄漏不确定性最大。PlumeQuant诊断工具基于指定规范重新计算IME、泄漏长度、排放率及五项不确定性，并评估四种掩码表示：分布式参考掩码、不透明的碳测绘仪启发式模拟（CM-like）、GA集合以及可选专家编辑。CM-like掩码在不访问参考掩码或公开数值的前提下生成，仅在44个独立场景的开发集上固定参数。其在公开的IME上偏差仅为+0.72%（中位数），排放率偏差+0.16%（均值绝对误差6.98%），与参考掩码的交并比中位数达0.843，不确定性尺度匹配良好（中位数比例1.01）。保留测试集上的均值绝对误差分别为7.6%（IME）、9.5%（长度）、6.1%（速率）。这些为产品级一致性诊断，非独立验证，旨在标记弱信号、偏移或模糊泄漏供专家审查。
原文摘要 · Abstract (English)
Imaging spectrometers increasingly distribute source-resolved methane plume products in which the plume mask, integrated mass enhancement (IME), plume length, emission rate, and uncertainty are physically and algorithmically linked. Using 63 EMIT-derived Carbon Mapper plume records from 27 scenes, we show that these published scalar quantities do not uniquely constrain the plume boundary: substantially different yet plausible masks reproduce the same IME, plume length, and emission rate. Genetic-algorithm (GA) ensembles conditioned on the published IME and plume length make this equifinality explicit: the high-confidence core selected by nearly all target-consistent masks covers a median of 13% of the plausible footprint envelope, and ambiguity is largest for weak, low-overlap plumes. The diagnostics come from PlumeQuant, which recomputes IME, plume length, emission rate, and five-term uncertainty from distributed product components under stated conventions and evaluates four mask representations: the distributed reference mask, a transparent Carbon Mapper-informed analogue (CM-like), the GA ensemble, and optional expert edits. The CM-like mask is generated per plume without access to the reference mask or published quantities, with settings fixed once on a scene-disjoint 44-plume development split. It reproduced published IME with +0.72% median difference and emission rate with +0.16% (6.98% mean absolute), reached 0.843 median intersection-over-union against the reference masks, and matched the published uncertainty scale (median ratio 1.01). Holdout mean absolute errors were 7.6% (IME), 9.5% (length), and 6.1% (rate). These are product-level consistency diagnostics, not independent validation. They flag weak, offset, or ambiguous plumes for expert review.
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