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Classes GeoidG2012B, GeoidKarney and GeoidPGM to
interpolate the height of various geoids at
LatLon
locations or separate lat-/longitudes using different
interpolation methods and geoid
files.
GeoidKarney is a transcription of Charles Karney's C++ class Geoid to pure Python.
The GeoidG2012B and GeoidPGM interpolators both depend on scipy and numpy and require those packages to be installed.
In addition, each geoid interpolator needs grid knots
to
be (down)loaded from a geoid file, specific to the interpolator, more
details below. For each interpolator, there are several interpolation
choices, like linear, cubic, etc.
Typical usage is as follows. First create an interpolator from a
geoid file, also referred to as the grid knots
.
ginterpolator = GeoidXyz(grid_file, **options)
Get the interpolated geoid height of LatLon
location(s)
with
h = ginterpolator(ll)
or
h0, h1, h2, ... = ginterpolator(ll0, ll1, ll2, ...)
or
hs = ginterpolator(lls)
# list, tuple, generator,
...
For separate lat-/longitudes invoke the .height
method
h = ginterpolator.height(lat, lon)
or
h0, h1, h2, ... = ginterpolator.height(lats, lons)
#
list, ...
Errors from scipy
are raised as SciPyErrors. Warnings issued by scipy
can
be thrown as SciPyWarning exceptions, provided Python
warnings
are filtered accordingly, see SciPyWarning.
See Also: Charles Karney's GeographicLib, Geoid height and Installing the Geoid datasets, SciPy interpolation RectBivariateSpline and interp2d and the functions elevations.elevation2 and elevations.geoidHeight2.
Version: 20.01.22
Classes | |
GeoidError Geoid interpolator Geoid... or interpolation issue.
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PGMError Issue parsing or cropping an egm*.pgm geoid dataset.
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_GeoidBase (INTERNAL) Base class for Geoid... s.
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GeoidG2012B Geoid height interpolator for GEOID12B Model grids CONUS, Alaska, Hawaii, Guam and Northern Mariana Islands, Puerto Rico and U.S. Virgin Islands and American Samoa based on SciPy RectBivariateSpline or interp2d interpolation.
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GeoidKarney Geoid height interpolator for Charles Karney's GeographicLib Earth Gravitational Model (EGM) geoid egm*.pgm datasets using bilinear or cubic interpolation and caching in pure Python transcribed from Karney's C++ class Geoid. |
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GeoidPGM Geoid height interpolator for Charles Karney's GeographicLib Earth Gravitational Model (EGM) geoid egm*.pgm datasets but based on SciPy
RectBivariateSpline or interp2d interpolation.
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Functions | |||
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Function Details |
Generate geoid egm*.pgm height tests from GeoidHeights.dat Test data for Geoids.
Note:
Function egmGeoidHeights is used to test the geoids GeoidKarney and GeoidPGM, see PyGeodesy module
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