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-rw-r--r--docs/source/operations/conversions/topocentric.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/source/operations/conversions/topocentric.rst b/docs/source/operations/conversions/topocentric.rst
index 828ef4e0..14019965 100644
--- a/docs/source/operations/conversions/topocentric.rst
+++ b/docs/source/operations/conversions/topocentric.rst
@@ -46,7 +46,9 @@ topocentric conversion must be preceded by the :ref:`cart` conversion to
perform the initial geographic to geocentric coordinates conversion.
The formulas used come from the "Geocentric/topocentric conversions" paragraph
-of :cite:`IOGP2018`
+of :cite:`IOGP2018`. ``+proj=topocentric`` alone corresponds to the ``EPSG:9836``
+conversion method, ``+proj=cart`` followed by ``+proj=topocentric`` corresponds
+to ``EPSG:9837``.
Usage
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