In Figure , the Keller Canyon Landfill (1004011) and Rumpke Sanitary Landfill (1004856) differ in that TD estimates of point-source emissions align with or are lower than GHGRP self-reported rates and are generally much lower than estimates of total emissions for these landfills. The emissions data for Rumpke Sanitary (1004856) are noteworthy in that detected CH4 from this landfill during a single overpass but did not quantify a rate, possibly due to failure of the data to meet quality assurance criteria. estimated a rate of 200 kg CH4/h with GHGSat, whereas Nesser et al. ( ) estimated a rate of 4452.1 kg CH4/h based on atmospheric inversion with TROPOMI. These are 0.2 and 3.9 times the GHGRP self-reported rate of 1131 kg CH4/h, respectively. For these landfills, point-sources may contribute less to total emissions, GHGRP self-reported rates are underestimates, estimates of total landfill emissions are overstated, or some combination thereof. The emissions data for the Sampson County Landfill (1004118) show widely different estimates of point source emissions between methods . This emphasizes that temporally variable emissions tied to temperature, moisture, and barometric pressure changes may underpin these estimates. Alternatively, different point-sources emitting higher and lower rates may have been detected in and , respectively. The estimate from of 4686.2 kg CH4/h does agree with estimates of total emissions for this landfill, albeit over a large uncertainty range.