MET Online Tutorial

MET Online Tutorial for METv3.0

Point-Stat Tool: Run

Next, run Point-Stat on the command line using the following command:

    bin/point_stat \
    data/sample_fcst/2007033000/nam.t00z.awip1236.tm00.20070330.grb \
    tutorial/out/pb2nc/tutorial_pb.nc \
    tutorial/config/PointStatConfig_tutorial \
    -outdir tutorial/out/point_stat \
    -v 2

Point-Stat is now performing the verification tasks we requested in the configuration file. It should take a minute or two to run.

In this example, Point-Stat accumulates matched forecast/observation pairs into 48 groups based on our configuration file selections. The 48 groups are a result of: 4 fields (TMP/Z2, TMP/P750-850, UGRD/Z10, VGRD/Z10) * 2 observing message types * 3 masking regions * 2 interpolation methods. However, many of these combinations, such as verifying TMP/Z2 versus upper-air observations (ADPUPA), will result in zero matched pairs being found. As Point-Stat runs, you should see several status messages printed to the screen to indicate progress.

arrow The execution time of Point-Stat can be greatly improved by disabling the computation of bootstrap confidence intervals. To see the effect of this, edit the configuration file tutorial/config/PointStatConfig_tutorial, set the n_boot_rep variable equal to 0, and re-run the previous Point-Stat command. It should run more than twice as fast.

arrow The execution time of Point-Stat can also be improved by disabling the computation of rank correlation statistics. To see the effect of this, edit the configuration file tutorial/config/PointStatConfig_tutorial, set the rank_corr_flag variable equal to 0, and re-run the previous Point-Stat command. It should now run even faster.