Dr. Xiao-Le Deng

SRTM2gravity: Global Gravimetric Terrain Corrections Models

2020-11-05 11:00

1. Introduction

SRTM2gravity is a global gravity map with 3" (- 90 m) spatial resolution. It represents the gravity field generated by the MERIT topography model and a mass-density assumption of 2670 kg m^(-3). The model can be viewed as a topographic gravity model and a modern model of gravimetric terrain corrections where the gravity effect associated with terrain irregularities (valleys, summits), but also the effect of a spherical Bouguer shell is represented by a single data set. Different to "standard" terrain corrections, our model represents the total gravitational signal of the Earth's global topography in spherical approximation. It does not require separate modelling of Bouguer plates or Bouguer shells, and is not limited to, e.g., 167 km zones, as is the case in classical terrain corrections.

The SRTM2gravity model is an improved successor of the gravity component of the ERTM2160 short-scale gravity model (Hirt et al. 2014 Comp. Geosc.), and a precursor for a future update of the GGMplus gravity maps (Hirt et al. 2013, GRL). The improvements of SRTM2gravity over previous efforts are threefold: improved methodology, improved data and improved resolution (see Hirt et al. 2019 for details).

Data: http://ddfe.curtin.edu.au/models/SRTM2gravity2018

2. Reference

Hirt, C., Yang, M., Kuhn, M., Bucha, B., Kurzmann, A., & Pail, R. (2019). SRTM2gravity: an ultrahigh resolution global model of gravimetric terrain corrections. Geophysical Research Letters, 46(9), 4618-4627. https://doi.org/10.1029/2019GL082521