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. Author manuscript; available in PMC: 2019 Sep 1.
Published in final edited form as: Water Resour Res. 2018 Jul 17;54(9):6374–6392. doi: 10.1029/2017WR020991

Figure 2:

Figure 2:

Conceptual diagram of a nonparametric DA efficiency metric. Panel (a) illustrates the amount of information in the model about the in situ measurements according to Equation [3] (with Y replaced by X). Panel (b) illustrates the information added by the remote sensing retrievals according to Equation [6]. Panel (c) illustrates the total amount of information captured by the model and retrieval together about the evaluation data according to Equation [7]. Panel (d) illustrates the efficiency ratio in Equation [8] - the information shared between the DA analysis time series and the evaluation data will always be less than the total available information due to inefficiencies in the DA algorithm.