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-rw-r--r--docs/source/operations/projections/cass.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/docs/source/operations/projections/cass.rst b/docs/source/operations/projections/cass.rst
index 95684e51..5428260a 100644
--- a/docs/source/operations/projections/cass.rst
+++ b/docs/source/operations/projections/cass.rst
@@ -65,6 +65,10 @@ Options
.. include:: ../options/R.rst
+.. option:: +hyperbolic
+
+ Use modified form of the standard Cassini-Soldner projection known as the Hyperbolic Cassini-Soldner.
+ This is used in particular for the "Vanua Levu Grid" of the the island of Vanua Levu, Fiji (EPSG:3139)
Mathematical definition