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 5.1.1 of SCC

The new SCC version (released on 06/06/2019) brings many important updates and enhancements:


1) SCC product file format

The SCC v5.1 generates products which are:


2) Quicklook web interface

A new color was adopted to distinguish between cloud-free regions (white regions) from no-data region (grey regions) in cloudmask quicklooks.

Please, keep in mind that the quicklook web interface ( will be password protected until the 31 of July 2019. After this date the password will be removed and it will become accessible to anybody.

IMPORTANT: We recommend to take advantage from this period for checking that everything is fine for your station on EARLINET quicklook web interface (
In particular, you should check that:


3) Other enhancements


where 'sss' is the new 3 digits station code and HHHHMMDD hhmm is the start of the measurement.

In making the update we tried to not break any existing configuration.
So you should be able to log-in with your old username and password and find on the server all the configurations and measurements you have already uploaded before the upgrade.

As a consequence all the products on the servers are still the ones generated by you running the previous SCC version (v5.0). If you like you can re-calculate those products using the new version of the SCC (actually we recommend to do so). Please, keep in mind that in this case you are going to overwrite all your products! So, if you like to keep your old products you should make a back-up of them before trying to re-run the new SCC version.

Please, always remember 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