Figure 8
From: A New GPS SNR-based Combination Approach for Land Surface Snow Depth Monitoring

Comparison of SNR data of GPS L1, L2 and L5 signals and in situ snow depths at KIRU. (a) Snow depths estimated using SNR observations of GPS L1, L2 and L5 signals; (b) correlations between GPS L1, L2 and L5 observations and in situ measurements; (c) residuals between the estimated (from GPS L1, L2 and L5 observations) and in situ snow depths.