Use Case: Feature Relative

Use Case: Feature Relative cindyhg Mon, 06/24/2019 - 14:36

METplus Use Case: Feature Relative (Series-Analysis by lead, by forecast hour grouping)


In this exercise, you will perform a series analysis based on the lead time (forecast hour) of your sample data and organize your results by forecast hour groupings. This use case utilizes the MET Tc-Pairs, Tc-Stat, and Series-Analysis tools, and the METplus wrappers: TcPairs, ExtractTiles, TcStat, and SeriesAnalysis. Please refer to the MET User's Guide for a description of the MET tools and the METplus Users Guide for more details about the wrappers. Please note that the METplus User's Guide is a work-in-progress and may have missing content.

Change to the METplus Tutorial Directory:


Review Use Case Configuration File: series_by_lead_by_fhr_grouping.conf

View the file and study the configuration variables that are defined.

less ${METPLUS_BUILD_BASE}/parm/use_cases/model_applications/medium_range/TCStat_SeriesAnalysis_fcstGFS_obsGFS_FeatureRelative_SeriesByLead.conf

Note that the Lead time groupings are specified by the LEAD_SEQ config options. 
# forecast lead sequence 1 list (0, 6, 12, 18)
LEAD_SEQ_1 = begin_end_incr(0,18,6)
# forecast lead sequence 1 label
# forecast lead sequence 2 list (24, 30, 36, 42)
LEAD_SEQ_2 = begin_end_incr(24,42,6)
# forecast lead sequence 2 label

This references OUTPUT_BASE which you set in the METplus system configuration file (metplus_config/metplus_system.conf). METplus config variables can reference other config variables, even if they are defined in a config file that is read afterwards.

Run METplus

Run the following command: \
-c ${METPLUS_TUTORIAL_DIR}/tutorial.conf \
${METPLUS_BUILD_BASE}/parm/use_cases/model_applications/medium_range/TCStat_SeriesAnalysis_fcstGFS_obsGFS_FeatureRelative_SeriesByLead.conf \
-c dir.OUTPUT_BASE=${METPLUS_TUTORIAL_DIR}/output/feature_relative_by_lead_fhr_groupings

You will see output streaming to your screen. This may take up to 3 minutes to complete. When it is complete, your prompt returns.

If you see an error that references NCAP2, this is correctable. NCAP2 is a netCDF tool that can usually be found in the location where nco is installed. Check /usr/local/nco first or with your system administrator if you are having trouble.

metplus ( ERROR: Executable NCAP2 does not exist at ncap2
run-METplus-metplus: ERROR: Executable NCAP2 does not exist at ncap2

This error can be overcome by adding the path to the executable in your ${METPLUS_TUTORIAL_DIR}/tutorial.conf file. Add the following and then re-run.

NCAP2 = /path/to/ncap2
# e.g. NCAP2=/usr/local/nco/bin/ncap2

Review the Output Files

You should have output directories including the following that result from running the wrappers TcPairs, ExtractTiles, and TcStat, respectively:

ls ${METPLUS_TUTORIAL_DIR}/output/feature_relative_by_lead_fhr_groupings

and the output directory of interest, from the SeriesByLead wrapper:


That directory contains the following directories:

ls ${METPLUS_TUTORIAL_DIR}/output/feature_relative_by_lead_fhr_groupings/series_analysis_lead

Day1 contain the following files:

ls ${METPLUS_TUTORIAL_DIR}/output/feature_relative_by_lead_fhr_groupings/series_analysis_lead/Day1

The OBS_FILES_F000_to_F018 is a text file that contains a list of the data that is included in the series analysis.

Day2 contains equivalent files for forecast leads 24 to 42.

The .nc files are the series analysis output generated from the MET Series-Analysis tool.

The .png and .ps files are graphics files that can be viewed using display:

display ${METPLUS_TUTORIAL_DIR}/output/feature_relative_by_lead_fhr_groupings/series_analysis_lead/Day1/series_F000_to_F018_TMP_Z2_FBAR.png &


display ${METPLUS_TUTORIAL_DIR}/output/feature_relative_by_lead_fhr_groupings/series_analysis_lead/Day1/ &

Note: the & is used to run this command in the background

The series_animate directory contains the gif images of the animations:

ls ${METPLUS_TUTORIAL_DIR}/output/feature_relative_by_lead_fhr_groupings/series_analysis_lead/series_animate

To watch the animations, go to ${METPLUS_TUTORIAL_DIR}/output/series_by_lead_fhr_grouping/series_analysis_lead/series_animate, enter the following (if firefox doesn't work you can use animate instead):

cd ${METPLUS_TUTORIAL_DIR}/output/feature_relative_by_lead_fhr_groupings/series_analysis_lead/series_animate
firefox ${METPLUS_TUTORIAL_DIR}/output/feature_relative_by_lead_fhr_groupings/series_analysis_lead/series_animate/series_animate_TMP_Z2_FBAR.gif
firefox ${METPLUS_TUTORIAL_DIR}/output/feature_relative_by_lead_fhr_groupings/series_analysis_lead/series_animate/series_animate_TMP_Z2_ME.gif
firefox ${METPLUS_TUTORIAL_DIR}/output/feature_relative_by_lead_fhr_groupings/series_analysis_lead/series_animate/series_animate_TMP_Z2_OBAR.gif

Review the Log File

A log file is generated in your logging directory: ${METPLUS_TUTORIAL_DIR}/output/series_by_lead_fhr_grouping/logs. The filename contains the timestamp corresponding to the current day. To view the log file:

ls ${METPLUS_TUTORIAL_DIR}/output/feature_relative_by_lead_fhr_groupings/logs/metplus.log.*

Review the Final Configuration File

The final configuration file is metplus_final.conf. This contains all of the configuration variables used in the run.

less ${METPLUS_TUTORIAL_DIR}/output/feature_relative_by_lead_fhr_groupings/metplus_final.conf