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Diffstat (limited to 'docs/source/usage/projections.rst')
| -rw-r--r-- | docs/source/usage/projections.rst | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/docs/source/usage/projections.rst b/docs/source/usage/projections.rst index 464451c9..1f2e504f 100644 --- a/docs/source/usage/projections.rst +++ b/docs/source/usage/projections.rst @@ -42,23 +42,23 @@ Units +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Horizontal units can be specified using the ``+units`` keyword with a symbolic -name for a unit (ie. ``us-ft``). Alternatively the translation to meters can be -specified with the ``+to_meter`` keyword (ie. 0.304800609601219 for US feet). The -``-lu`` argument to ``cs2cs`` or ``proj`` can be used to list symbolic unit names. -The default unit for projected coordinates is the meter. +name for a unit (i.e. ``us-ft``). Alternatively the translation to meters can be +specified with the ``+to_meter`` keyword (i.e. 0.304800609601219 for US feet). The +``-lu`` argument to :program:`cs2cs` or :program:`proj` can be used to list +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. Vertical (Z) units can be specified using the ``+vunits`` keyword with a -symbolic name for a unit (ie. ``us-ft``). Alternatively the translation to -meters can be specified with the ``+vto_meter`` keyword (ie. 0.304800609601219 -for US feet). The ``-lu`` argument to ``cs2cs`` or ``proj`` can be used to list -symbolic unit names. If no vertical units are specified, the vertical units will -default to be the same as the horizontal coordinates. +symbolic name for a unit (i.e. ``us-ft``). Alternatively the translation to +meters can be specified with the ``+vto_meter`` keyword (i.e. 0.304800609601219 +for US feet). The ``-lu`` argument to :program:`cs2cs` or :program:`proj` can +be used to list symbolic unit names. If no vertical units are specified, the +vertical units will default to be the same as the horizontal coordinates. .. note:: - ``proj`` do not handle vertical units at all and hence the ``+vto_meter`` - argument will be ignored. + :program:`proj` does not handle vertical units at all and hence the + ``+vto_meter`` argument will be ignored. Scaling of output units can be done by applying the ``+k_0`` argument. The returned coordinates are scaled by the value assigned with the ``+k_0`` @@ -97,8 +97,8 @@ name, or the longitude of the alternative prime meridian relative to greenwich. Currently prime meridian declarations are only utilized by the ``pj_transform()`` API call, not the ``pj_inv()`` and ``pj_fwd()`` calls. -Consequently the user utility ``cs2cs`` does honour prime meridians but the -``proj`` user utility ignores them. +Consequently the user utility :program:`cs2cs` does honour prime meridians but +the :program:`proj` user utility ignores them. The following predeclared prime meridian names are supported. These can be listed using with ``cs2cs -lm``. @@ -157,7 +157,7 @@ They can be combined in +axis in forms like: .. note:: - The ``+axis`` argument does not work with the ``proj`` command line + The ``+axis`` argument does not work with the :program:`proj` command line utility. |