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.. _operations:
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Coordinate operations
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Coordinate operations in PROJ are divided into three groups:
Projections, conversions and transformations.
Projections are purely cartographic mappings of the sphere onto the plane.
Technically projections are conversions (according to ISO standards), though in
PROJ projections are distinguished from conversions. Conversions are coordinate
operations that do not exert a change in reference frame. Operations that do
exert a change in reference frame are called transformations.
.. toctree::
:maxdepth: 1
projections/index
conversions/index
transformations/index
pipeline
operations_computation
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