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.. _airy:
********************************************************************************
Airy
********************************************************************************
The Airy projection is an azimuthal minimum error projection for the region
within the small or great circle defined by an angular distance,
:math:`\phi_b`, from the tangency point of the plane :math:`( \lambda_0, \phi_0 )`.
+---------------------+----------------------------------------------------------+
| **Classification** | Azimuthal |
+---------------------+----------------------------------------------------------+
| **Available forms** | Forward spherical projection |
+---------------------+----------------------------------------------------------+
| **Defined area** | Global |
+---------------------+----------------------------------------------------------+
| **Alias** | airy |
+---------------------+----------------------------------------------------------+
| **Domain** | 2D |
+---------------------+----------------------------------------------------------+
| **Input type** | Geodetic coordinates |
+---------------------+----------------------------------------------------------+
| **Output type** | Projected coordinates |
+---------------------+----------------------------------------------------------+
.. image:: ./images/airy.png
:scale: 50%
:alt: Airy
Options
################################################################################
.. option:: +lat_b
Angular distance from tangency point of the plane :math:`( \lambda_0, \phi_0 )`
where the error is kept at minimum.
*Defaults to 90° (suitable for hemispherical maps).*
.. option:: +no_cut
Do not cut at hemisphere limit
.. include:: ../options/lat_0.rst
.. include:: ../options/lon_0.rst
.. include:: ../options/x_0.rst
.. include:: ../options/y_0.rst
.. include:: ../options/R.rst
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