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pyGrav, a Python-based program for handling and processing relative gravity data

pyGrav, a Python-based program for handling and processing relative gravity data
Auteurs : Hector B., Hinderer J.
Journal : Computers & Geosciences 2016
Doi : doi:10.1016/j.cageo.2016.03.010

Abstract : pyGravi, a Python-based open-source software dedicated to the complete processing of relative-gravity data. It is particularly suited for time lapse gravity surveys where high precision is sought. Its purpose is to bind together single-task processing code sinauser friendly interface for handy and fast treatment of raw gravity data from many stations of a network. The intuitive object based implementation allows to easily integrate additional functions (reading/writingroutines, processingschemes, dataplots) related to the appropriate object (a station, a loop,or a survey).This makes pyGrav an evolving tool. Raw data can be corrected for tides and air pressure effects.The data selection step features a double table-plot graphical window with either manual or automatic selection according to specific thres holds on data channels (tilts, gravity values, gravity standard deviation, duration of measurements, etc.). Instrumental drifts and gravity residuals are obtained by least square analysis of the data set. This first step leads to the gravity simple differences between a reference point and any point of the network. When different repetitions of the network are done, the software computes then the gravity double differences and associated errors. The program has been tested on two specific case studies : a large data set acquired for the study of water storage changes on a small catchment in West Africa, and a data set operated and processed by several different users for geothermal studies in northern Alsace, France. In bothcases, pyGrav proved to be an efficient and easy-to-use solution for the effective processing of relative-gravity data.

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4 octobre 2016