MET Overview for METv4.1

MET Tools

The major components of the MET package are represented in the figure below (Fig 1). The main stages represented are data reformatting, plotting, statistical analysis, aggregation, and Tropical Cyclone evaluation. MET Version 4.1 consists of 21 tools organized into 5 groups:
  1. Data reformatting and preparation tools:
    • Gen-Poly-Mask Tool
    • PCP-Combine Tool
    • MODIS-Regrid Tool
    • WWMCA-Regrid Tool
    • ASCII2NC Tool
    • PB2NC Tool
    • MADIS2NC Tool
    • Ensemble-Stat Tool (also listed below)
  2. Plotting tools:
    • Plot-Data-Plane
    • WWMCA-Plot
    • Plot-Point-Obs
  3. Statistical verification tools:
    • MODE (Method For Object-Based Diagnositic Evaluation) Tool
    • Wavlet-Stat Tool
    • Grid-Stat Tool
    • Series-Analysis Tool
    • Ensemble-Stat Tool (also listed above)
    • Point-Stat Tool
  4. Aggregation and analysis tools:
    • MODE-Analysis Tool
    • Stat-Analysis Tool
  5. Tropical Cyclone evaluation tools:
    • TC-DLand
    • TC-Pairs
    • TC-Stat

METv4.1 flow chart

Figure 1: Flowchart representation of METv4.1 structure. Green areas represent executables, while gray represent data.

Gen-Poly-Mask Tool

  • Apply a Lat/Lon polyline to a gridded data file to define a verification masking region in an efficient way.
  • Write masking region bitmap output to NetCDF format.
  • Optionally run prior to Point-Stat, Grid-Stat, Wavelet-Stat, and MODE tools.

PCP-Combine Tool

  • Add, subtract, or sum up precipitation from multiple GRIB files.
  • Write output to intermediate NetCDF format.
  • Optionally run prior to Grid-Stat and MODE tools.

MODIS-Regrid Tool

  • Reformat gridded MODIS data in HDF format into a gridded NetCDF format that MET can read.

WWMCA-Regrid Tool

  • Regrid the global WWMCA binary data to a user-defined grid.
  • Write output gridded NetCDF file that may be read by the other MET tools.

ASCII2NC Tool

  • Reformat point observations from ASCII to NetCDF.
  • Currently supports little_R, SURFRAD, and MET point observation formats.

PB2NC Tool

  • Stratify the contents of PrepBufr files containing point observations.
  • Write output to intermediate NetCDF format.

MADIS2NC Tool

  • Reformat MADIS NetCDF point observations.
  • Currently supports METAR, RAOB, PROFILER, and MARITIME data types.

Plot-Data-Plane Tool

  • Extract a single 2-dimensional slice of data from a gridded data file and plot it.
  • Write output PostScript plot.

WWMCA-Plot Tool

  • Create a plot of the global WWMCA binary data.
  • Write output PostScript plot.

Plot-Point-Obs Tool

  • Create a plot showing the locations of the point observations contained in the NetCDF output of the ASCII2NC, PB2NC, or MADIS2NC tools.
  • Write output PostScript plot.

MODE Tool

  • Apply an object-based verification technique in comparing a gridded forecast to a gridded analysis.
  • Write output to ASCII statistics files, write object fields to NetCDF format, and generate a PostScript summary plot.

Wavelet-Stat Tool

  • Apply an intensity-scale wavelet decomposition verification technique in comparing a gridded forecast to a gridded analysis.
  • Write output to ASCII statistics files, write decomposed fields to NetCDF format, and generate a PostScript summary plot.

Grid-Stat Tool

  • Compute traditional and neighborhood verification scores by comparing a gridded forecast to a gridded analysis.
  • Write output to ASCII statistics files and write matched pairs to NetCDF format.

Series-Analysis Tool

  • Define a series of gridded forecasts and gridded analyses and compute traditional verification scores over that series for each grid point to see how model performance varies spatially.
  • Write output gridded NetCDF file.

Ensemble-Stat Tool

  • Process multiple ensemble forecasts and derive common summary fields, such as ensemble mean, spread, and relative frequency. These output fields may be verified using other MET statistics tools.
  • If observations are provided, also compute rank histograms, continuous ranked probability scores, and spread-skill variance measures.
  • Write output to ASCII statistics files and write ensemble fields to NetCDF format.

Point-Stat Tool

  • Compute traditional and neighborhood verification scores by comparing a gridded forecast to point observations (output of ASCII2NC, PB2NC, or MADIS2NC tools).
  • Write output to ASCII statistics files.

MODE-Analysis Tool

  • Compute aggregate object-based verification information across mulitple cases.
  • Filter contents of MODE object files based upon search parameters.

Stat-Analysis Tool

  • Compute aggregate verification scores across mulitple cases.
  • Filter the contents of STAT files (output of the Point-Stat, Grid-Stat, and Wavelet-Stat tools) based upon search parameters.

TC-DLand Tool

  • Parse land data file and compute distances to land over a regular grid.
  • Write output gridded NetCDF file for use by the TC-Pairs tool.

TC-Pairs Tool

  • Parse ADeck (forecast) and BDeck (BEST track analyses) ATCF files, filter the data, and match them up.
  • Write output ASCII TCST (Tropical-Cyclone Statistics) file containing track pair information.

TC-Stat Tool

  • Filter the TCST output of TC-Pairs based upon search parameters, define one or more columns of interest, and compute summary statistics.
  • Write summary statistics to ASCII output.