In order to use the website and be able to upload your data, you have to format your input file in this way (using commas or semicolons between the fields): longitude,latitude,altitude (or empty field),magnitude. Or else: longitude;latitude;altitude (or empty field);magnitude. Besides, it has to be a csv or a txt file.
This website tool has been developed by Prof. Dr. Carlo Grillenzoni
and Dr. Diego Migliavacca
This code implements a Graphical User Interface for mean-shift clustering algorithms (simple, blurred and truncated), with data-driven selection of the optimal bandwidth. It can handle and cluster data tables in csv and txt format.
Methods and technical details are described in the paper.
Reference: Design of Blurred Mean-Shift Algorithms for Data Classification Journal of Classification
More infos here