Calculate geoid height as determined from EGM96 Geopotential Model
geoidegm96
will be removed in a future
version. Use geoidheight
instead.
N = geoidegm96(lat, long)
N = geoidegm96(lat, long, action)
N = geoidegm96(lat, long)
calculates the
geoid height as determined from the EGM96 Geopotential Model. It calculates
geoid heights to 0.01 meters. This function interpolates geoid heights
from a 15-minute grid of point values in the tide-free system, using
the EGM96 Geopotential Model to the degree and order 360. The geoid
undulations are relative to the WGS84 ellipsoid.
N = geoidegm96(lat, long, action)
calculates
the geoid height as determined from the EGM96 Geopotential Model.
This function performs action
if latitude
or longitude
are
out of range.
Inputs required by geoidegm96
:
lat | An array of m geocentric latitudes, in degrees,
where north latitude is positive and south latitude is negative. lat must
be of type single or double. If lat is not within
the range -90 to 90, inclusive, this function wraps the value to be
within the range. |
long | An array of m geocentric longitudes, in
degrees, where east longitude is positive and west longitude is negative. long must
be of type single or double. If long is not within
the range 0 to 360 inclusive, this function wraps the value to be
within the range. |
action | Action for out-of-range input. Specify if out-of-range input
invokes a 'Warning' , 'Error' ,
or no action ('None' ). The default is 'Warning' . |
Calculate the geoid height at 42.4 degrees N latitude and 71.0 degrees E longitude.
N = geoidegm96( 42.4, 71.0)
Calculate the geoid height at two different locations, with out-of-range actions generating warnings.
N = geoidegm96( [39.3,33.4], [-77.2, 36.5])
Calculate the geoid height with latitude wrapping, with out-of-range actions displaying no warnings.
N = geoidegm96(100,150,'None')
This function has the limitations of the 1996 Earth Geopotential Model. For more information,
see https://earth-info.nga.mil/GandG/wgs84/gravitymod/egm96/egm96.html
.
The WGS84 EGM96 geoid undulations have an error range of +/-0.5 to +/-1.0 meters worldwide.
NIMA TR8350.2: “Department of Defense World Geodetic System 1984, Its Definition and Relationship with Local Geodetic Systems.”
NASA/TP-1998-206861: “The Development of the Joint NASA GSFC and NIMA Geopotential Model EGM96”
National Geospatial-Intelligence Agency Website: http://earth-info.nga.mil/GandG/wgs84/gravitymod/egm96/egm96.html