日本測地学会
The Geodetic Society of Japan

6. GNSS-A analysis software "GARPOS"

  • DOI: https://doi.org/10.57553/2024003
  • Authors: Shun-ichi Watanabe (Hydrographic and Oceanographic Department, Japan Coast Guard (JHOD)), Tadashi Ishikawa (JHOD), Yusuke Yokota (Institute of Industrial Science, University of Tokyo), Yuto Nakamura (JHOD)
  • Abstract: This software is a Python3-based analysis software for GNSS-A observations that simultaneously estimates the seafloor station positions and spatiotemporal changes in underwater sound velocity perturbation fields. This software parameterize that the strength of the smoothing constraint on disturbance field parameters corresponding to the sonic field disturbance and data error covariance . Adjusting the relevant parameters by minimizing ABIC (Akaike, 1980) or maximizing the marginal likelihood, it is possible to suppress overfitting to the data and obtain a stable solution.
  • Original site: Github https://github.com/s-watanabe-jhod/garpos/tree/v1.0.1
  • Persistent link: ZENODO https://zenodo.org/records/6414642
  • Method:
  • Keywords: GNSS-A, seafloor geodesy, sound speed structure, GNSS-A methodology, GNSS-A oceanography
  • Correspondence: Shun-ichi Watanabe (Hydrographic and Oceanographic Depertment, Japan Coast Guard)
  • Resource Type: Software
  • Date: v0.1.0: 2020/8/14 v1.0.0: 2021/2/9 v1.0.1: 2022/4/5
  • GeoLocation:
  • IsDescribedBy : Frontiers in Earth Science https://doi.org/10.3389/feart.2020.597532
  • Version: 1.0.1
  • Additional Information: Version: Latest version is GARPOS v1.0.1 (Apr. 5. 2022); Requirements: Python 3.7.3 Packages NumPy, Scipy, Pandas, Matplotlib, and Scikit-sparse are also required. Fortran 90 compiler (e.g., gfortran);
  • Rights: GPL-3.0
  • Fund:
  • Subject: Seafloor geodesy
  • Cite as:

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  • Title(J): GNSS-A解析ソフトウェア "GARPOS"
  • Authors(J): 渡邉俊一(海上保安庁海洋情報部)，石川直史(海上保安庁海洋情報部)，横田裕輔(東京大学生産技術研究所)，中村優斗(海上保安庁海洋情報部)
  • Abstract(J): 本ソフトウェアは，海底局位置と海中音速摂動場の時空間変化を同時に推定するPython3ベースのGNSS-A観測用の解析ソフトウェアです．音速場擾乱に相当する擾乱場パラメータの平滑化拘束の強さやデータ誤差共分散の強さをパラメタライズし，ABIC（Akaike, 1980）最小化あるいは周辺尤度最大化による当該パラメータの調整によって，データへの過剰適合を抑え，安定的な解を得ることができます．
  • Method(J):
  • Keywords(J): GNSS-A, seafloor geodesy, sound speed structure, GNSS-A methodology, GNSS-A oceanography
  • Correspondence(J): 渡邉俊一（海上保安庁海洋情報部）
  • Additional Information(J): Version: Latest version is GARPOS v1.0.1 (Apr. 5. 2022); Requirements: Python 3.7.3 Packages NumPy, Scipy, Pandas, Matplotlib, and Scikit-sparse are also required. Fortran 90 compiler (e.g., gfortran);