Table 1
Standard deviation of the flow maps for vx after applying the calibration factor and correlation with the LCT flow maps computed from uncompressed data.
| Compression method | Time lag ΔT | σ [m/s] | Corr. with uncompressed | |||
| without filtering | with filtering | without filtering | with filtering | |||
|
|
||||||
| uncompressed | 45 s | 215 | 159 | 1 | 1 | |
| 22.5 min | 227 | 158 | 0.926 | 0.983 | ||
| 45 min | 237 | 155 | 0.857 | 0.964 | ||
| quantization (n = 2) | 45 s | 217 | 159 | 0.996 | 0.999 | |
| 22.5 min | 260 | 162 | 0.805 | 0.956 | ||
| 45 min | 296 | 164 | 0.684 | 0.912 | ||
| JPEG (q = 10) | 45 s | 213 | 154 | 0.976 | 0.997 | |
| 22.5 min | 316 | 165 | 0.669 | 0.907 | ||
| 45 min | 376 | 174 | 0.550 | 0.835 | ||
Notes. We show results both for the nominal flow maps provided by the FLCT code (as shown in Fig. 2) and for the same flow maps after convolving them (both the uncompressed and the compressed data) with a Gaussian with a width of σG = 3 Mm.
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