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Coordinate Transformation Suite (abridged CTS) is a library developed to perform coordinate transformations using well known geodetic algorithms and parameter sets. It strives to be simple, flexible and interoperable, in this order.


Originally developed by Michaël Michaud under the name of JGeod, the library was renamed to CTS in 2009. Today CTS is maintained by the OrbisGIS team in collaboration with Michaël Michaud.

The new CTS has been funded by the French Agence Nationale de la Recherche (ANR) under research contract ANR-08-VILL-0005-01 and the regional council of the Région Pays de La Loire under the Système d'Orbservation Géographique de la Ville (SOGVILLE) project.


CTS is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License.

CTS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with CTS. If not, see

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