Community Modeling and Analysis System



How do you know if you should use PAVE or VERDI?

VERDI was developed as a replacement for the PAVE program. Because PAVE is no longer in active development and support is limited, VERDI offers the best option as a state-of-the-art visualization program.

Visualize gridded netCDF data with this easy-to-use Java program.

VERDI is a Java program for visualizing meteorology, emissions, and air quality modeling data. With options for overlaying GIS Shapefiles and observational data onto model output, VERDI offers a range of options for viewing atmospheric modeling data. VERDI scripting provides a powerful interface for automating the production of graphics for analyzing your data.



VERDI uses Java, which makes it easy to install and is portable across different operating systems.

VERDI packages are distributed for 64-bit Windows, Linux, and Mac.


The VERDI user environment is an intuitive GUI that makes importing datasets, creating formulas, and generating and saving plots easy.

Supported Plot Types

VERDI currently can be used to create 2-D tile plots, vertical cross sections, scatter plots, timeseries line, timeseries bar, 3-D contour plots, vector-tile plots, areal interpolation plots, and observation-tile plots.

Supported File Format Conventions

CMAQ Input/Output Applications Programming Interface (I/O API) netCDF, WRF netCDF, MPAS netCDF, CAMx (UAM-IV), and I/O API and text-based ASCII formats (for observational data).


VERDI can be driven with a scripting language to allow batch-generation of images.


  • Support for MPAS netCDF files.
  • Updated world map.
  • Option to display elevation for vertical cross-section plots.
  • Can specify pixel size of exported raster (e.g., PNG) images.
  • New statistics: count, fourth maximum, and custom percentile.
  • Preliminary support for MCIP v5.0+ netCDF files.

History of VERDI

Driven by the air quality modeling community's need for a replacement to PAVE, the U.S. EPA sponsored the development of VERDI. PAVE is a Unix-based software system written in C and Motif. While the EPA is satisfied with the functionality of PAVE and desired to keep those capabilities, they recognize that the PAVE technology is outdated and wanted an updated, more efficient, flexible, and modular visualization software system. Argonne National Laboratory initially developed VERDI to duplicate the functionality of PAVE in a Java program. VERDI development continues thanks to the efforts of the U.S. EPA's National Computer Center/Environmental Modeling and Visualization Laboratory and the Institute for the Environment at the University of North Carolina - Chapel Hill.

Latest Version: VERDI version 2.0_beta


VERDI Training


Previous Documentation

Online Resources

System Requirements

O/S Windows, Linux, Mac
Memory 1024 MB RAM
Software All needed VERDI components are contained in the distribution package.