Services - Geoid
Repository
Regional Models
Puerto
Rico
|
| Authors: D.A. Smith, D.R. Roman | Created: 1999 | Resp: D.R. Roman |
| Status: PUBLIC |
| Description:
GEOID99 is a gravimetric geoid model for Puerto Rico and Virgin Islands computed by the National Geodetic Survey (NGS). It is
referred to the GRS80 normal ellipsoid in the ITRF96 frame (epoch 1997.0). It has a 1'x1' spatial resolution in latitude and
longitude. Unlike the grid for the conterminous United States, this GEOID99 model does not incorporate GPS/levelling data. The
gravimetric geoid determination for Puerto Rico and Virgin Islands is based on the same techniques as G99SSS for the conterminous
United States, namely on the use of the one-dimensional spherical Fast Fourier Transform (FFT) to evaluate Stokes' integral. It is
performed in the framework of a remove-restore procedure, where long wavelengths come from the EGM96 geopotential model, while the
terrain correction is computed by using a digital elevation model with a spatial resolution of 3''x3''. Due to poorer data coverage,
error estimates for GEOID99 in this region are larger than the ones of G99SSS in the conterminous United States.
References: D.A. Smith, D.R. Roman (2001). GEOID99 and G99SSS: 1-arc-minute geoid models for the United States. Journal of Geodesy, 75(9), pp. 469-490. DOI: 10.1007/s001900100200 Web of Science ID: DRCI:DATA2019017015400537 |
