MET Online Tutorial

MET Online Tutorial for METv3.0

Point-Stat Tool: General

Point-Stat Functionality

The Point-Stat tool provides verification statistics for forecasts at observation points, as opposed to over gridded analyses. The Point-Stat tool matches gridded forecasts to point observation locations using several configurable interpolation methods. The tool then computes continuous as well as categorical verification statistics for the matched pairs falling inside the verification masking regions defined by the user. The categorical statistics generally are calculated by applying one or more thresholds to the forecast and observation values. Confidence intervals, which represent a measure of uncertainty, are computed for most of the verification statistics.

Please see the METv3.0 release notes for a description of new features in Point-Stat for this release.

Point-Stat Usage

View the usage statement for Point-Stat by simply typing the following:

    bin/point_stat

At a minimum, the input fcst_file in GRIB or NetCDF format (from pinterp or PCP-Combine), the input obs_file in NetCDF format (from PB2NC or ASCII2NC), and the configuration config_file must be passed in on the command line.

You may use the -point_obs command line argument to specify additional NetCDF observation files to be used. In order to produce anomaly statistics (SAL1L2 and VAL1L2 line types described in the MET Users Guide), you must specify a file containing climatological data using the -climo command line argument. You may also explicitly define the observation valid time window to determine which observations are used in the verification by using the -obs_valid_beg and -obs_valid_end command line arguments.