IGPS: IDL tool package for GPS position time series analysis

Abstract

A new tool package written in Interactive Data Language (IDL) was developed for processing and analyzing daily continuous GPS position time series. This software package can read continuous GPS position time series in various formats, detect outliers, remove abnormal observation spans, locate epochs of offsets or post-seismic relaxation events, and estimate their amplitudes. It also provides functionalities for epoch statistics, site selection, periodic noise analysis, spatial filtering (by regional stacking), etc. This tool is referred to as iGPS.