Africa
|
Authors: H.H. Fashir,
M.A. Kadir |
Created: 1997
|
Resp: H.H. Fashir
|
Description:
Regional geoid computed for the whole
Africa, ranging from 350 S to
400 N in Latitude and 200
W to 500 E in Longitude. The
EGM96 geopotential model truncated to
degree and order 70 was combined with
surface gravity data and modified
Stokes's Kernel to generate the geoid
file. The surface data consists of 10
x 10, 30' x 30' mean gravity
anomalies and 30'x 30' topographic
information (coming from NIMA and OSU).
Comparison of the gravimetric geoid with
the Doppler/levelling derived geoidal
heights of 92 stations all over Africa
shows that the absolute agreement with
respect to the Doppler/levelling datum
is generally better than 1.85m
RMS. Other global models,
such as OSU91A and EGM96 complete to
degree and order 360 were also included
in the comparison, showing that the new
gravimetric geoid achieves the best
agreement with the Doppler/levelling
data.
Data are in meters, stored in an ASCII
file, in grd format, parallelwise from N
to S and from W to E.
References:
H.H. Fashir, M.A. Kadir (1998). African
regional gravimetric geoid 1997:
Stokesian approach. IGeS Bulletin, 8,
pp. 65-84.
Web of Science ID:
DRCI:DATA2014041004285927
|
|
