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geod
**What will I learn ?** In this section, you will learn how to use the geod tool.
What is geod ?
``geod`` (direct) and ``invgeod`` (inverse) perform geodesic ("Great Circle") computations for determining latitude, longitude and back azimuth of a terminus point given a initial point latitude, longitude, azimuth and distance (direct) or the forward and back azimuths and distance between an initial and terminus point latitudes and longitudes (inverse). The results are accurate to round off for `|f| < 1/50`, where f is flattening.
``invgeod`` may not be available on all platforms; in this case call geod with the -I option.
geod Synopsis
geod Example
The following script determines the geodesic azimuths and distance in U.S. statute miles from Boston, MA, to Portland, OR:
which gives the results:
where the first two values are the azimuth from Boston to Portland, the back azimuth from Portland to Boston followed by the distance.
An example of forward geodesic use is to use the Boston loca- tion and determine Portland's location by azimuth and distance:
which gives:
Lack of precision in the distance value compromises the precision of the Portland location.
Further reading
`GeographicLib <https://geographiclib.sourceforge.io/>`_
`C. F. F. Karney, Algorithms for Geodesics, J. Geodesy 87, 43-55 (2013) <https://link.springer.com/article/10.1007/s00190-012-0578-z>`_. `Addendum <https://geographiclib.sourceforge.io/geod-addenda.html>`_
`The online geodesic bibliography <https://geographiclib.sourceforge.io/geodesic-papers/biblio.html>`_
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  2. proj_quickstart
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`C. F. F. Karney, Algorithms for Geodesics, J. Geodesy 87, 43-55 (2013) <https://link.springer.com/article/10.1007/s00190-012-0578-z>`_. `Addendum <https://geographiclib.sourceforge.io/geod-addenda.html>`_
`C. F. F. Karney, Algorithms for Geodesics, J. Geodesy 87, 43-55 (2013) <https://link.springer.com/article/10.1007/s00190-012-0578-z>`_. `Addendum <https://geographiclib.sourceforge.io/geod-addenda.html>`_
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../../build/doc/quickstart/proj_quickstart.rst:201
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Translation file
locale/pot/quickstart/proj_quickstart.pot, string 36