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The center of gravity (COG) of an object is the point where the object's total weight is considered to be concentrated. Knowing the location of the center of gravity is useful when predicting the behavior of a moving object or designing static structures. In a uniform gravitational field, the center of gravity is similar to the center of mass (COM); yet, these two points can be positioned differently. For example, the Moon's center of mass lies very close to its geometric center, but...
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The center of gravity is the point at which an object's weight appears to be concentrated and can be used to balance the object perfectly. This point is essential in mechanics as it provides information regarding a body's stability and moments of inertia. The center of gravity does not always have to fall within the shape or boundaries of the body; it may also lie outside the body in certain cases.
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Gravitation is one of the four fundamental forces in nature. The force between objects on Earth and Earth itself is called gravity.
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Aggregates typically contain pores, which can be either permeable or impermeable. Considering the pores in the aggregates, the specific gravity of aggregates is defined in three different forms, namely, bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity.
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SYSU_Topo: a 1-arc-minute global bathymetry from SWOT-derived gravity using the gravity-geological method.

Wei Feng1, Dechao An2, Cheinway Hwang3

  • 1School of Geospatial Engineering and Science, Sun Yat-sen University, Zhuhai, 519082, China. fengwei@mail.sysu.edu.cn.

Scientific Data
|January 23, 2026
PubMed
Summary
This summary is machine-generated.

A new global bathymetric product, SYSU_Topo, was created using Surface Water and Ocean Topography (SWOT) data and gravity anomalies. This product offers improved seafloor mapping and ocean modeling capabilities.

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Area of Science:

  • Oceanography
  • Geophysics
  • Geodesy

Background:

  • The Surface Water and Ocean Topography (SWOT) mission offers new insights into Earth's water bodies.
  • Accurate global bathymetry is crucial for ocean modeling and geophysical studies.
  • Existing bathymetric data has limitations in coverage and precision.

Purpose of the Study:

  • To develop a novel global bathymetric product named SYSU_Topo.
  • To leverage SWOT mission data and gravity anomalies for enhanced bathymetric mapping.
  • To provide openly accessible data and processing codes for scientific reuse.

Main Methods:

  • Utilized gravity anomalies from the SWOT_02 model and the gravity-geological method (GGM).
  • Employed a sliding-window strategy for partition inversion to determine optimal density contrast.
  • Developed a fusion method with boundary-constraint points to mitigate splicing effects.

Main Results:

  • The SYSU_Topo model provides global bathymetry data (80°S to 80°N) at 1-arc-minute resolution.
  • Validation against extensive bathymetric points and GEBCO_2024 data confirmed model reliability.
  • SYSU_Topo demonstrated superior performance in the South China Sea, outperforming other models by 8%-26%.

Conclusions:

  • SWOT data shows significant potential for improving bathymetry in data-sparse regions.
  • The SYSU_Topo product offers a valuable resource for ocean modeling, geophysics, and seafloor mapping.
  • Openly available data and codes facilitate further research and applications.