EddyPro® is a powerful open source software application for processing eddy covariance data. It computes fluxes of water vapor (evapotranspiration), carbon dioxide, methane, other trace gases, and energy with the Eddy Covariance method.

EddyPro is developed, maintained and supported by LI‑COR Biosciences. It originates from ECO₂S, the Eddy COvariance COmmunity Software project, which was developed as part of the Infrastructure for Measurement of the European Carbon Cycle (IMECC-EU) research project. We gratefully acknowledge the IMECC consortium, the ECO₂S development team, the University of Tuscia (Italy) and scientists around the world who assisted with development and testing of the original version of this software.

The EddyPro installer installs the following components:

• EddyPro Engine, the core engine, a command line software
• EddyPro GUI, the graphical user interface to configure and run the engine
• EddyPro Help, consisting in a local context-sensitive help system, a local html version of the online EddyPro Help system, the 'Getting Started' and 'User Guide' documents in PDF format

Both Engine and GUI are pre-built for a particular environment (operating system and compiler).

EddyPro 7 is now protected under an End User License Agreement (EULA). The software will continue to be free of charge, and while EddyPro 7 will remain an open-source software, this new license limits the use of EddyPro by other commercial organizations. The EddyPro source code will continue to be available to academic and government researchers around the world, and because we encourage and welcome modifications from that same community. These new licenses were chosen to protect EddyPro and the investment of LI-COR and contributing researchers from ongoing efforts by other commercial entities from taking free and open source code and re-releasing it for profit under a proprietary software platform.

Prior versions of EddyPro were released with and will retain the GNU General Public License (GPL) v3.0.

EddyPro is a fully cross-platform application, which consists of a set of command line programs and a graphical user interface (GUI).

The source code is developed using two independent Git repositories, namely:

• eddypro-engine
• eddypro-gui

You can download EddyPro from the LI-COR EddyPro web page. The page provides download links for all supported platforms.

Start the installation program like any executable on the development platform. Select the components that you want to install and follow the instructions of the installation program to complete the installation.

To build EddyPro follow these instructions:

To compile the Engine use gfortran (The GNU Fortran compiler) and run:

$ cd prj
$ make rp
$ make fcc

Source code compilation instructions for the GUI are undergoing a revision. They will posted as soon the update is completed.

To successfully run Eddypro, the program installation folder must contain the following command line utilities under the 'bin' sub-directory:

• 7-zip
• pausep

7-Zip is a file archiver.

The console application consists of two files:

• 7z.dll
• 7z.exe

License: LGPL.

Pausep it's a Win32 process suspend/resume tool, available on Code Project.

It consists of one file:

• pausep.exe

License: Code Project Open License, CPOL.

You can run EddyPro using sample data files available at the LI-COR EddyPro web page.

• Axis rotation for sonic anemometer tilt correction

  • Double rotation
  • Triple rotation
  • Sector-wise planar fit (Wilczak et al., 2001)
  • Sector-wise planar fit with no velocity bias (van Dijk et al., 2004)

• Detrending of raw time series

  • Block averaging
  • Linear detrending
  • Running mean
  • Exponential running mean

• Compensation of time lag between sonic anemometer and gas analyzer measurements

  • Automatic time lag optimization (optionally as a function of RH for H₂O)
  • Maximum covariance with default (circular correlation)
  • Maximum covariance without default
  • Constant
  • None (option to not apply compensation)

• Statistical tests for raw time series data (Vickers and Mahrt, 1997)

  • Spike count/removal (Mauder et al., 2013)
  • Amplitude resolution
  • Dropouts
  • Absolute limits
  • Skewness and kurtosis
  • Discontinuities
  • Time lags
  • Angle of attack
  • Steadiness of horizontal wind
  • Individually selectable and customizable

• Compensation for air density fluctuations

  • Webb et al., 1980 (open path) / Ibrom et al., 2007a (closed path)
  • Use (or convert to) mixing ratio (Burba et al., 2012)
  • Optional off-season upatake correction for LI-7500 (Burba et al., 2008)
  • None (option to not apply compensation)

• Correction for frequency response (attenuation)

  • Analytic high-pass filtering correction (Moncrieff et al., 2004)
  • Low-pass filtering, select and configure:
    • Moncrieff et al. (1997)
    • Massmann (2000)
    • Horst (1997)
    • Ibrom et al. (2007b)
    • Horst and Lenschow (2009)
    • Fratini et. al. (2012)

• Quality control tests for fluxes according to Foken et al. (2004)

  • Flagging according to Carbo Europe standard (Mauder and Foken, 2004)
  • Flagging according to Foken (2003)
  • Flagging after Göckede et al. (2004)

• Random uncertainty estimation

  • Mann and Lenschow (1994)
  • Finkelstein and Sims (2001)

• Flux footprint estimation

  • Kljun et al. (2004)
  • Kormann and Meixner (2001)
  • Hsieh et al. (2000)

• Other options applied in both Express and/or Advanced Mode include:

  • Sonic temperature correction for humidity following van Dijk et al. (2004)
  • Spectroscopic correction for LI-7700 following McDermitt et al. (2011)
  • Angle of attack corrections for Gill anemometers following Nakai et al. (2006)
  • Angle of attack corrections for Gill anemometers following Nakai and Shimoyama (2012)
  • Inclusion of biomet data for improved flux computation/correction

• Available outputs

  • Full (rich) output with fluxes, quality flags and much more (standard format or available results only)
  • FLUXNET output (complying latest FLUXNET format definition)
  • Ameriflux format
  • GHG Europe format
  • Raw data statistics
  • Full length spectra and co-spectra
  • Binned spectra and co-spectra
  • Binned ogives
  • Ensemble averaged spectra
  • Ensemble averaged cospectra, fitted models and ideal (Kaimal) cospectra
  • Details of steady state and turbulence tests
  • Raw data time series after each statistical tests/correction
  • Averaged biomet data

In order to help users who want to cite EddyPro on posters or publications, LI-COR provides guidelines for the proper use of the EddyPro wordmark and logo.

More information is available at:

• EddyPro web page
• EddyPro help

Be sure to check out the 'What's new' page, which will list any known problems or limitations of the current and past versions.

See also the CHANGELOG.

We hope you will enjoy using EddyPro!