METViewer: General

METViewer Overview

The METViewer tool reads MET verification statistics output from a database and creates plots using the R statistical package. The tool includes a web application that can be accessed from a web browser to create a single plot. The specification for each plot is built using a series of controls and then serialized into XML. For each plot, METViewer generates a SQL query, an R script to create the plot, a flat file containing the data that will be plotted and the plot itself.

METViewer Web Application

The following examples can be run using the METViewer instance located at the link below. It is recommended to move the new tab into a new browser window, so that you can view both the example instructions and the METViewer web application side-by-side.

METViewer Web App

NOTE: you may need to configure your browser to allow pop-ups from the domain www.dtcenter.org

The following pages have instructions for generating two different types of plots:

• A threshold series plot of Accuracy (ACC), Critical Success Index (CSI) and base rate
• A forecast lead time box plot series of MODE object area distributions

Please be sure to follow the instructions in order. At certain points, METViewer may display a Loading... message. This message indicates that METViewer is searching the database for information.