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-rw-r--r--docs/source/operations/projections/chamb.rst42
1 files changed, 41 insertions, 1 deletions
diff --git a/docs/source/operations/projections/chamb.rst b/docs/source/operations/projections/chamb.rst
index 2ec9bffe..1c0a7f17 100644
--- a/docs/source/operations/projections/chamb.rst
+++ b/docs/source/operations/projections/chamb.rst
@@ -6,5 +6,45 @@ Chamberlin Trimetric
.. image:: ./images/chamb.png
:scale: 50%
- :alt: Chamberlin Trimetric
+ :alt: Chamberlin Trimetric
+Parameters
+################################################################################
+
+Required
+--------------------------------------------------------------------------------
+
+.. option:: +lat_1=<value>
+
+ Latitude of the first control point.
+
+.. option:: +lon_1=<value>
+
+ Longitude of the first control point.
+
+.. option:: +lat_2=<value>
+
+ Latitude of the second control point.
+
+.. option:: +lon_2=<value>
+
+ Longitude of the second control point.
+
+.. option:: +lat_3=<value>
+
+ Latitude of the third control point.
+
+.. option:: +lon_3=<value>
+
+ Longitude of the third control point.
+
+Optional
+--------------------------------------------------------------------------------
+
+.. include:: ../options/lon_0.rst
+
+.. include:: ../options/R.rst
+
+.. include:: ../options/x_0.rst
+
+.. include:: ../options/y_0.rst