Fig. 3: Reconstructed surface CH4 concentrations and locations of sensors.
From: Where to place methane monitoring sites in China to better assist carbon management

Spatial distributions of mean surface CH4 concentrations across China from (a) WRF-GHG and reconstructed results with (b) MCN, (c) Extrema and (e) QR pivot algorithms under the condition of 10 POD modes and 20 sensors (P = 2n); (d) DEIM under P = n; associated locations of sensors (f–i).