Single Calculus Chain (SCC)

The EARLINET Single Calculus Chain (SCC) is a tool for the automatic analysis of aerosol lidar measurements. The development of this tool started in the framework of EARLINET-ASOS (European Aerosol Research Lidar Network – Advanced Sustainable Observation System); it was extended and is continuing under the  ACTRIS (Aerosol, Clouds and Trace gases Research InfraStructure Network) umbrella. The main aim of SCC is to provide  a data processing chain that allows all EARLINET stations to retrieve, in a fully automatic way, the aerosol backscatter and extinction profiles starting from the raw lidar data of the lidar systems they operate. All input parameters needed to perform the lidar analysis are stored in a database to keep track of all changes which may occur for any EARLINET lidar system over the time, assuring the traceability of the data. The end user can interact with the SCC via a user-friendly web interface. All SCC modules are developed using open-source and freely available software packages. The high-quality of the SCC products is proven by the good agreement between the SCC analysis, and the corresponding independent manual retrievals. Finally, the ability of the SCC to provide high-quality aerosol optical products is demonstrated for an EARLINET intense observation period.


Access SCC

A general username and password is needed for accessing the SCC main page. After the log-in you should have access to the main page of the SCC web interface directly. A second (specific) log-in is needed to access to the effective use of the SCC. Any user is linked to a specific station for handling data analysis of that system.

forum is also available where SCC problems are discussed and several suggestions can be found.


Registration to SCC for ACTRIS stations

For registration to SCC of ACTRIS stations, contact the SCC manager Giuseppe D'Amico


Registration to SCC for not ACTRIS stations

The usage/testing of the SCC is available also for not ACTRIS stations! If you are interested please read the "Terms of Use" and request the registration of your station using the "Registration Form".



Version 5.0 of SCC

The new SCC version (released on 08/11/2018) brings many important updates and enhancements:


1) New SCC workflow

The SCC workflow has been modified by including 4 new calculus modules: HiRELPP, Cloudmask, ELIC and ELQUICK


2) SCC product file format

All the SCC products are in NetCDF format and are CF compliant. To meet the CF compliance we had to modify the NetCDF structure of all the SCC products with respect to the old ones. This means that your reading software for the SCC products should be changed accordingly.In particular, the optical products generated by the SCC v5.0 are different from the EARLINET files we have used up to now. The new format is the same we have used for the publication of the data on CERA database. For the moment such files CANNOT be uploaded on the EARLINET database because it still requires the old format. Anyway we are going to release the new version of EARLINET database (presumably in January 2019) that will accept the new format only.

IMPORTANT: only the SCC product file format is changed. The raw input file format is still the same. This means no specific modifications are needed in your own converter to generate input file for the new SCC version.


3) Other enhancements

Please, note that in order to generate the new products (HiRELPP, Cloumask, ELIC and ELQUICK), it is necessary to define for the configuration(s) an high resolution product, following some basic instructions on how to do that.
Please report problems or suggestions on the SCC forum available at:




D'Amico, G., Amodeo, A., Baars, H., Binietoglou, I., Freudenthaler, V., Mattis, I., Wandinger, U., and Pappalardo, G.: EARLINET Single Calculus Chain – overview on methodology and strategy, Atmos. Meas. Tech., 8, 4891-4916, doi:10.5194/amt-8-4891-2015, 2015

D'Amico, G., Amodeo, A., Mattis, I., Freudenthaler, V., and Pappalardo, G.: EARLINET Single Calculus Chain – technical – Part 1: Pre-processing of raw lidar data, Atmos. Meas. Tech., 9, 491-507, doi:10.5194/amt-9-491-2016, 2016

Mattis, I., D'Amico, G., Baars, H., Amodeo, A., Madonna, F., and Iarlori, M.: EARLINET Single Calculus Chain – technical – Part 2: Calculation of optical products, Atmos. Meas. Tech., 9, 3009-3029, doi:10.5194/amt-9-3009-2016, 2016