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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
(down)loaded from a geoid
file, specific to the
interpolator, more details below. For each interpolator, there are
several interpolation choices, for example 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)
Then, 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- and longitudes invoke the .height
method
>>> h = ginterpolator.height(lat, lon)
or
>>> h0, h1, h2, ... = ginterpolator.height(lats, lons)
# lists, tuples, ...
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: Karney's GeographicLib, Geoid height and Installing the Geoid datasets, SciPy interpolation RectBivariateSpline and interp2d and the functions elevations.elevation2 and elevations.geoidHeight2.
Version: 20.10.11
Classes | |
_GeoidBase (INTERNAL) Base class for Geoid... s.
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GeoidError Geoid interpolator Geoid... or interpolation issue.
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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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GeoidHeight5Tuple 5-Tuple (lat, lon, egm84, egm96, egm2008) for GeoidHeights.dat tests with the heights for 3
different EGM grids with degrees90 and
degrees180 degrees (after converting lon
from the original 0.0 <= EasterLon <= 360.0 ).
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GeoidKarney Geoid height interpolator for 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 Karney's GeographicLib Earth Gravitational Model (EGM) geoid egm*.pgm datasets but based on SciPy
RectBivariateSpline or interp2d interpolation.
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PGMError Issue parsing or cropping an egm*.pgm geoid dataset.
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Functions | |||
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Variables | |
__all__ = _ALL_LAZY.geoids
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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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