The AUTh geoid based on 1D FFT with Wong-Gore modification of the Stokes kernel for the Colorado Experiment: ColFFTWG2020

The ColFFTWG2020 quasi-geoid model is a gravimetric model and has been computed by the Laboratory of Gravity Field Research and Applications, Aristotle University of Thessaloniki. The model has been computed in the frame of the International Association of Geodesy Joint Working Group 2.2.2 "The 1 cm geoid experiment" and the so called "Colorado experiment". The area covered by the models is 108.5°E ≤ longitude ≤ 103.5°E, 36.5°N ≤ latitude ≤ 38°N with a grid spacing of 2' in both latitude and in longitude. The computation is based on the remove-compute-restore technique with XGM2106 being used as a reference field. The topographic effects were treated using a Residual Terrain Correction (RTC) by solving the spectral filter problem of RTC using Earth2014 and ERTM2160 models. The input gravity data include terrestrial and airborne data combined using Least-Squares Collocation (LSC). The final estimation was carried out using 1D FFT with Wong-Gore modification of the Stokes kernel. The accuracy of the model, when compared against GSVS17 GPS/leveling, is at 2.5 cm level. The geoid model is provided in ISG format 2.0 (ISG Format Specifications), while the file in its original data format is available at the model ISG webpage.

ColFFTWG2020准大地水准面模型（ColFFTWG2020 quasi-geoid model）是一款重力场模型（gravimetric model），由亚里士多德大学塞萨洛尼基分校重力场研究与应用实验室完成计算。该模型的计算依托于国际大地测量协会（International Association of Geodesy）联合工作组2.2.2“1厘米大地水准面实验”以及“科罗拉多实验”的研究框架。模型覆盖范围为东经108.5° ≤ 经度 ≤ 东经103.5°、北纬36.5° ≤ 纬度 ≤ 北纬38°，经纬度方向的网格间距均为2角分。计算过程采用移去-计算-恢复（remove-compute-restore）技术，以XGM2106作为参考场。地形效应处理采用残差地形改正（Residual Terrain Correction, RTC）方法，通过Earth2014与ERTM2160模型求解残差地形改正的频谱滤波问题实现。输入重力数据涵盖地面重力与航空重力数据，并通过最小二乘配置（Least-Squares Collocation, LSC）方法完成融合。最终解算采用一维快速傅里叶变换（1D FFT）结合斯托克斯核（Stokes kernel）的Wong-Gore修正算法完成。将该模型与GSVS17 GPS/水准数据进行比对后，其精度可达2.5厘米。该大地水准面模型采用ISG 2.0格式（ISG Format Specifications）提供，原始数据格式文件可在该模型对应的ISG网页获取。

搜集汇总

背景与挑战

背景概述

ColFFTWG2020是一个重力场模型，覆盖特定地理区域，采用1D FFT技术和Wong-Gore修改的Stokes核计算，精度达2.5厘米。该模型由塞萨洛尼基亚里士多德大学开发，属于国际大地测量学协会的'1厘米大地水准面实验'项目。