Comparison to aerial data. Having no ground truth controlled release data to compare CMS estimates against, we instead compare to rate estimates from an aerial measurement technology with well documented quantification performance. To perform this comparison, we first identify the 30-minute quantification interval that overlaps with each overpass of the aerial technology. If multiple overpasses occur during a given 30-minute interval, we average the aerial estimates so that there is one value to compare the CMS output against. We then compare the CMS quantification estimates during that interval (both from the vendor and from the DLQ algorithm) to the estimated emission rate from the aerial technology.