Browsing by Author "Pedro, Nuno Alexandre Branco Rosa"
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- Processing and Analysis of Positional Time-SeriesPublication . Pedro, Nuno Alexandre Branco Rosa; Fernandes, Rui Manuel da Silva; Crocker, PaulIn the last three decades, GNSS networks have acquired data that allows positional time series of their stations to be calculated. The secular velocity due to the movement of tectonic plates is one of the main parameters to be estimated by processing the collected data, which is normally daily positions of the GNSS stations Hector is a software package that calculates the secular velocity and other associated parameters using such data. Solutions for the parameters of interest are obtained by analyzing the three components separately. Additional parameters can be seasonal variations, noise, and offsets; these parameters can complicate the process of estimating the secular velocity. Therefore, there is a need to use specific software for this calculation. Hector is used on a large scale, meaning the number of time series processed can be large. Therefore, time savings become essential. To optimize this time, changing and combining several parameters is possible. This study suggests some changes that allow, in addition to great time savings, to optimize this software. Running Hector requires the creation of specific configuration files that are sometimes difficult to do by an inexperienced user using commands on a Linux terminal. Therefore, an application was developed to facilitate interaction with Hector. This application has two interaction components with Hector. The first is an API component that allows a user to make requests and receive responses through a command line interface making it easier to create requests in existing environments with a large numbers of stations. The second component is a GUI, where it is also possible to make requests to Hector and obtain the results. All these tools were implemented in the TSA application, developed in PHP, JavaScript and HTML, interacting with Python and TC-Shell scripts that then allow the use of a SQL database together with the application that completes all the functionalities of the application.