Repository for Gravity Field Modeling and Recovery using Machine Learning Methods
python machine-learning tensorflow aerospace planetary-science gravity-model physics-informed-neural-networks
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Apr 14, 2025 - Python
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gravity-model
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Numerical simulation of orbital dynamics under the Moon's non-uniform gravitational field (J2, mascons).
spherical-harmonics numerical-integration orbital-mechanics mission-analysis satellite-orbits celestial-mechanics gravity-model space-simulation mascons j2-perturbation cislunar lunar-orbit apsidal-precession lunar-astrodynamics lunar-gravity spacecraft-dynamics trajectory-propagation keplerian-orbits nodal-precession mci-frame
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Nov 10, 2025 - Jupyter Notebook
Streamline transportation planning with the Gravity Model's Python implementation. This repository offers a comprehensive README, user-friendly Python script, and practical examples, making it straightforward for users to implement and adapt the model to their specific urban planning scenarios.
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Jan 2, 2024 - Python
A performance-effective program for gravity field calculation for layered ellipsoidal density model.
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May 29, 2023 - C++
The implementation of the Small Bodies Geophysical Analysis Tool (SBGAT)
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Apr 18, 2020 - C++
A QGIS plugin for spatial analysis
clustering gravity-model mean-center median-center central-feature standard-deviation-ellipse standard-distance
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Oct 17, 2025 - Python
End-to-End Python econometric pipeline for modeling geopolitical risk in international trade using advanced Bayesian filtering, high-dimensional fixed effects, and split-panel jackknife inference. Replicates Hardwick's (2025) methodology with full robustness testing and automated reporting.
python reproducible-research state-space political-science econometrics particle-filter gdelt panel-data quantitative-analysis computational-economics political-economy international-trade wto trade-data gravity-model ppml bayesian-filtering risk-modeling trade-policy geopolitical-risk
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Sep 26, 2025 - Jupyter Notebook
Stochastic model of invasive zebra/quagga mussel spread as facilitated by boat traffic, built for QGIS
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Jan 29, 2022 - Python
This project implements a gravity accelerator using Verilog and Vivado. It simulates the physics of gravitational acceleration, calculating velocity and position over time within a digital circuit environment. The project includes testbenches and waveform analysis to ensure accurate simulation and performance.
fpga hardware verilog vivado physics-simulation hardware-designs hardware-acceleration testbench gravity-simulation digital-simulation gravity-model gravity-algorithm
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Aug 26, 2024 - Pascal
R & STATA code for (1) PPML gravity model (IV generation), (2) panel fixed effect regression (1st stage regression), and (3) local projection method
regression impulse-response econometrics panel-data international-trade local-projection gravity-model 2sls instrument-variable
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Sep 30, 2025 - R
A Gravity Model Analysis of High Speed Rail (HSR) Routes in North America
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Jan 5, 2022 - Jupyter Notebook
A package for downloading data from the UN Comtrade Database
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Apr 26, 2022 - R
Data and code for the paper 'Understanding Chinaβs urban system evolution from web search index data'
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Oct 17, 2022 - Cuda
Soukhov A, PΓ‘ez A, Higgins CD, Mohamed M (2023) Introducing spatial availability, a singly-constrained measure of competitive accessibility. PLOS ONE 18(1): e0278468. https://doi.org/10.1371/journal.pone.0278468
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Feb 17, 2024 - HTML
Discrete Unification Theory
quantum-mechanics cosmology tud general-relativity relativity dut gravity-model unified-model discrete-theory discrete-unification-theory teoria-de-la-unificacion-discreta unification-theory non-commutative
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May 10, 2025 - TeX
This script estimates a gravity model of international trade based on a setting file.
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Aug 21, 2018 - MATLAB
π Model political distance and trade dynamics using a quantitative framework to enhance understanding of international trade relationships.
python reproducible-research state-space political-science econometrics particle-filter gdelt quantitative-analysis computational-economics political-economy international-trade wto trade-data gravity-model ppml bayesian-filtering risk-modeling trade-policy
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Feb 19, 2026 - Jupyter Notebook
Report for the National Board of Trade Sweden evaluating the impact of the EU-Ukraine free trade agreement on trade flows using a gravity model.
r data-visualization econometrics causal-inference policy-analysis gravity-model difference-in-differences trade-policy
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Feb 25, 2025 - R
Templates and data for teaching a workshop on spatial interaction modelling using `R`.
workshop-materials gravity-model rstats-package spatial-interaction-modeling spatial-interaction-modelling
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Nov 15, 2022 - TeX
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