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china-gnss-velocities

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An open source GNSS velocity field in China.

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# An open source GNSS velocity field in China

![](https://raw.githubusercontent.com/purpleskyfall/china-gnss-velocities/master/velocities-cmonoc-itrf2014.png)

Velocities are extracted from the crustal deformation data of CMONOC:

> Zhao B, et al., Crustal deformation on the Chinese mainland during
> 1998-2004 based on GPS data, Geodesy and Geodynamics (2015)
> http://dx.doi.org/10.1016/j.geog.2014.12.006

The original horizontal velocities are respect to the Eurasia plate,
calculte the absolute values by:

```
V = ΔV + ω × X
```

Where V is the absolute velocities vector of one GPS station, ΔV is
velocities vector respected to Eurasia plate, ω is the Euler vector of
Eurasia plate in ITRF2008, X is the coordinate vector of the station.

However, the reference frame of the calculted absolute velocities V is
ITRF2008, transform them to ITRF2014 by:

```
         .   .     .
V' = V + T + D·X + R·X
```

Where the dot (T, D, R) are transform parameters from ITRF2008 to
ITRF2014, see:

> http://itrf.ensg.ign.fr/doc_ITRF/Transfo-ITRF2014_ITRFs.txt

Signification of the records:

- Lat: Latitude in angle degree;
- Lon: Longitude in angle degree;
- Vx: Velocity (mm/yr) in X component;
- Vy: Velocity (mm/yr) in Y component;
- Vz: Velocity (mm/yr) in Z component.

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