Member Login

Coordinate Transformation Standard

This standard provides a way for software to specify and access coordinate transformation services for use on specified spatial data. This standard addresses a key requirement for overlaying views of geospatial data from diverse sources: the ability to perform coordinate transformation in such a way that all spatial data are defined relative to the same spatial reference system.

Coordinate Transformation Service

Documents

(Hover over Type for full description)
Document title Version OGC Doc No. Type
OpenGIS Coordinate Transformation Service Implementation Specification 1.0 01-009 IS

Official model files and encoding schemas

Related links

Go To OGC Press Page →
OGC Open Call Requests
Overview

The Coordinate Transformation Service Standard (CT) provides a standard way for software to specify and access coordinate transformation services for use on specified spatial data. This standard addresses a key requirement for overlaying views of geodata (“maps”) from diverse sources: the ability to perform coordinate transformation in such a way that all spatial data are defined relative to the same spatial reference system.

Open Calls and Requests

Members of the public can review draft standards and share feedback to ensure they are practical and widely applicable.

OGC Seeks Public Comment on Proposed GeoHEIF Standards Working Group

Due by:

March 13, 2026 12:00 AM

Learn More

Insights

You’ll find the latest thought leadership from OGC here.  

OGC Individual Membership Is Now Live

We’re pleased to share that OGC Individual Membership is officially live. This new...

Learn More

At the Philadelphia Member Meeting, We Opened the Door Wider

Today, at the Philadelphia Member Meeting, we officially launched OGC Individual Membership. I’ve...

Learn More

From chat to map: How DGGS + Agentic AI turn geodata...

Results from the OGC AI-DGGS for disaster management pilot– and what we now...
Learn More
Join OGC