Global Mapping Function (GMF): A new empirical mapping function based on numerical weather model data
TLDR
In this paper, the Global Mapping Function (GMF) was proposed based on data from the global ECMWF numerical weather model and the coefficients of the GMF were obtained from an expansion of the Vienna mapping function (VMF1) parameters into spherical harmonics on a global grid.Abstract:
[1] Troposphere mapping functions are used in the analyses of Global Positioning System and Very Long Baseline Interferometry observations to map a priori zenith hydrostatic and wet delays to any elevation angle. Most analysts use the Niell Mapping Function (NMF) whose coefficients are determined from site coordinates and the day of year. Here we present the Global Mapping Function (GMF), based on data from the global ECMWF numerical weather model. The coefficients of the GMF were obtained from an expansion of the Vienna Mapping Function (VMF1) parameters into spherical harmonics on a global grid. Similar to NMF, the values of the coefficients require only the station coordinates and the day of year as input parameters. Compared to the 6-hourly values of the VMF1 a slight degradation in short-term precision occurs using the empirical GMF. However, the regional height biases and annual errors of NMF are significantly reduced with GMF.read more
Citations
More filters
Journal ArticleDOI
ITRF2008: an improved solution of the international terrestrial reference frame
TL;DR: ITRF2008 as mentioned in this paper is a refined version of the International Terrestrial Reference Frame based on reprocessed solutions of the four space geodetic techniques: VLBI, SLR, GPS and DORIS, spanning 29, 26, 12.5 and 16 years of observations, respectively.
Journal ArticleDOI
Space geodesy constrains ice age terminal deglaciation: The global ICE‐6G_C (VM5a) model
TL;DR: In this paper, a new model of the last deglaciation event of the Late Quaternary ice age is described and denoted as ICE-6G_C (VM5a), which has been explicitly refined by applying all of the available Global Positioning System (GPS) measurements of vertical motion of the crust that may be brought to bear to constrain the thickness of local ice cover as well as the timing of its removal.
Journal ArticleDOI
A geodetic plate motion and Global Strain Rate Model
TL;DR: The Global Strain Rate Model (GSRM v.2.1) as mentioned in this paper is a new global model of plate motions and strain rates in plate boundary zones constrained by horizontal geodetic velocities.
Journal ArticleDOI
Short Note: A global model of pressure and temperature for geodetic applications
TL;DR: The empirical model GPT (Global Pressure and Temperature), which is based on spherical harmonics up to degree and order nine, provides pressure and temperature at any site in the vicinity of the Earth's surface as mentioned in this paper.
References
More filters
Journal ArticleDOI
Global mapping functions for the atmosphere delay at radio wavelengths
TL;DR: In this article, the authors developed expressions for calculating the ratios (mapping functions) of the "line of sight" hydrostatic and wet atmospheric path delays to their corresponding zenith delays at radio wavelengths for elevation angles down to 3°.
Journal ArticleDOI
Troposphere mapping functions for GPS and very long baseline interferometry from European Centre for Medium-Range Weather Forecasts operational analysis data
TL;DR: In this paper, the b and c coefficients of the continued fraction form for the hydrostatic mapping functions have been determined using the 40 years reanalysis (ERA-40) data of the European Centre for Medium-Range Weather Forecasts for the year 2001, and the updated VMF, based on these new coefficients and called VMF1 hereinafter, yields slightly better baseline length repeatabilities for VLBI data.
Journal ArticleDOI
Comparison of Measurements of Atmospheric Wet Delay by Radiosonde, Water Vapor Radiometer, GPS, and VLBI
A. E. Niell,Anthea J. Coster,F. S. Solheim,V. B. Mendes,P. C. Toor,Richard B. Langley,C. A. Upham +6 more
TL;DR: In this article, the accuracy of the Global Positioning System (GPS) as an instrument for measuring the integrated water vapor content of the atmosphere has been evaluated by comparison with concurrent observations made over a 14-day period by radiosonde, microwave water vapor radiometer (WVR), and Very Long Baseline Interferometry (VLBI).
IERS Conventions (2003)
Dennis D. McCarthy,Gérard Petit +1 more
TL;DR: This document is intended to define the standard reference systems realized by the International Earth Rotation Service (IERS) and the models and procedures used for this purpose and the products of the IERS may be considered to be consistent with the description in this document.
Journal ArticleDOI
Vienna mapping functions in VLBI analyses
Johannes Boehm,Harald Schuh +1 more
TL;DR: Pressure level data from ECMWF (European Centre for Medium-Range Weather Forecasts) are applied to determine the coefficients of the VMF and the IMF and both mapping functions improve the repeatability of baseline lengths compared to the Niell Mapping Functions NMF.