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projections.rst: specify that +a and +b are always in metres #4010

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Jan 24, 2024
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projections.rst: specify that +a and +b are always in metres #4010

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8 changes: 4 additions & 4 deletions docs/source/usage/projections.rst
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Expand Up @@ -17,9 +17,9 @@ documenting the individual :doc:`projections<../operations/projections/index>`.
========== ================================================================
Parameter Description
========== ================================================================
+a Semimajor radius of the ellipsoid axis
+a Semimajor radius of the ellipsoid axis (always in meters)
+axis Axis orientation
+b Semiminor radius of the ellipsoid axis
+b Semiminor radius of the ellipsoid axis (always in meters)
+ellps Ellipsoid name (see ``proj -le``)
+k Scaling factor (deprecated)
+k_0 Scaling factor
Expand Down Expand Up @@ -51,8 +51,8 @@ specified with the ``+to_meter`` keyword (i.e. 0.304800609601219 for US feet).
symbolic unit names. The default unit for projected coordinates is the meter.
A few special projections deviate from this behavior, most notably the
latlong pseudo-projection that returns degrees.
Note that this does *not* affect the units of linear parameters such as ``+x_0``
or ``+y_0`` which should always be specified in meters.
Note that this does *not* affect the units of linear parameters such as ``+x_0``,
``+y_0``, ``+a`` or ``+b`` which should always be specified in meters.

Vertical (Z) units can be specified using the ``+vunits`` keyword with a
symbolic name for a unit (i.e. ``us-ft``). Alternatively the translation to
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