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Dr Yvan G Leclerc

Dr Yvan G Leclerc*


Fax: (650) 859-3735

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Alumnus of the Artificial Intelligence Center

Biography and Interests

Yvan G. Leclerc was a Program Manager in the Artificial Intelligence Center of SRI International, which he joined in 1985. He received his Bachelors in Electrical Engineering (Honours) in 1977, his Masters of Engineering in 1980, and his Ph. D. in 1989, all from McGill University. He worked in various areas of computer vision, computer graphics, and networking. His final projects included the development of mesh-based algorithms for recovering shape from multiple images, the self-consistency methodology, and the radiometry of multiple images; the design and engineering of a high-speed, network-based terrain visualization system called TerraVision; a DARPA-sponsored project on the Digital Earth; a proposal to ICANN for a new top-level Internet domain called .geo for indexing georefenced data on the Internet; and GeoVRML. Yvan lost his personal battle with Lymphoma on October 16, 2002. The inspiration of his work and life live on in the lives of the people with whom he worked and loved. Contact Ann Johnston with any questions concerning Yvan and his work. (

Past Projects


Battle Assessment and Data Dissemination (BADD)

Provided three-dimensional (3-D) site model data for integration with terrain data from other project participants, and provided our terrain visualization system, TerraVision, as an alternative visualization technology.

Terrain Change Detection

Continuous Terrain Modeling with Applications to Change Detection

The purpose of this project is to develop a robust and reliable method of detecting changes in the 3-D shape of terrain given sets of aerial/satellite images taken at different times.

Digital Earth

Creating and Visualizing the Digital Earth

Developing a connected suite of technologies with the vision of enabling a massive, scalable, and open model of the planet where millions of users can interact with vast quantities of geographically referenced data over the Web


Multidimensional Applications and Gigabit Internet Consortium (MAGIC)

MAGIC established a standards-based, gigabit internetworking testbed to support research and development for next generation networking technologies, and developed a defense-related application that required massive amounts of remotely stored and processed data in real time.


Multidimensional Applications and Gigabit Internet Consortium (MAGIC) II

MAGIC II consisted of a consortium of industry and academic institutions building a very general paradigm in which high-performance computing, storage, and communications are used to provide rapid access to massive amounts of data over the Internet


GeoTransform Package

GeoTransform Package

This package provides efficient and accurate geographic coordinate transformations in the Java language. It includes support for geodetic (lat/long), geocentric, UTM, lambert conformal conic, mercator, and OSGB coordinate systems.



GeoVRML is an extension to the Virtual Reality Modeling Language (VRML97) to support geographic applications.



TerraVision is a distributed, interactive terrain visualization system developed by SRI International. It allows users to navigate, in real time, through a 3-D graphical representation of a real landscape created from elevation data and aerial images of that landscape. All data can be distributed over the Web and support is provided for overlaying GeoVRML 3D models.

tsmApi Library

tsmApi Library

The Tile Set Manager (TSM) Application Programming Interface (API) is an Open Source library of high level C functions for reading, writing, and processing the terrain data used by the TerraVision terrain visualization application.


   Patent Pending.
   Patent Pending.
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   Patent Pending.


The following are in reverse chronological order of publication.
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