From 5c7bf5332ea446ee0ebee498912af6caf1c55e04 Mon Sep 17 00:00:00 2001 From: Even Rouault Date: Wed, 24 Jan 2024 01:02:20 +0100 Subject: [PATCH] projections.rst: specify that +a and +b are always in metres --- docs/source/usage/projections.rst | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/docs/source/usage/projections.rst b/docs/source/usage/projections.rst index ccc3733fcf..c571dc5bd4 100644 --- a/docs/source/usage/projections.rst +++ b/docs/source/usage/projections.rst @@ -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 @@ -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