Here are just a few of the people that made the VTP happen, primarily in the early period of 1999 to 2005.

• Chris 'Xenon' Hanson for code submissions, and building a bridge from the non-realtime terrain world!
• Pete Willemsen for Unix porting and useful work in road representation
• Roger James has contributed much work on buildings, roofs, imagery, format support, and much more
• Mike Flaxman for huge contributions to the VTP community including assembling the first massive real-world planning application
• Paul Selormey helped moderate the mailing list
• Lots of people who did the translations for internationalization of the applications
• Cassandra, for some research, modeling, and handling the distribution requests for 2 years
• Matt Wilkie for enthusiastic end-user testing and feedback
• Randall Hopper did lots of work on the Unix port of the VTP software
• Johan Hammes for great technology and ideas, and plants
• Robert Osfield of OSG, for a wonderful and well-supported 3D library
• Frank Warmerdam for amazing, tireless support of immensely useful libraries
• the late Seumas McNally, for proving that regular-grid LOD works for consumer apps, and writing what was then the best CLOD algorithm in the world
• Paul Hansen, Omnitect, for good ideas on global texturing and inspiring demo work
• Stewart and Bernd of Greenworks, for their fresh approach to plants
• Tom Hubina, John Ratcliff, Thatcher Ulrich, Chris Babcock, and many more developers in the game community for rendering ideas
• Travis and Tracey Heggie, geographers, met while they were at UH Hilo in 1999
• David Koller, for help implementing his LOD algorithm and enthusiastic encouragement to attempt the improbable
• Dave Eberly of Geometric Tools for the occasional algorithm
• Rachel Nador for cool work on intersections
• Peter, Lori, and the other folks who made Virtually Hawai‘i, for some early satellite images and website inspiration
• Bill Graham of ITESM's Ecovis project in Guaymas, Mexico, for collaboration and encouragement
• Honolulu-based STI Services, Florida-based Imagelinks, and Air Survey Hawai‘i for early demo imagery
• Priscilla Millen of UH for the excellent site Plants in the Hawaiian Environment
• Jack (3dweb.com), Josh, and other friends and associates who gave feedback for the explanation page
• the nice but overworked government employees at the Menlo Park USGS ESIC
• Robert W. Gray for his excellent educational notes and demonstration on the Dymaxion projection
• Richard Horne for sharing the source to his program 3DEM, which first showed how to read DEM files
• Deanan DaSilva, Erik Larsen and other in the graphics community that have contributed useful references
• Roger Bedell and Scott Williams for advice on the Building Extractor
• the thousands of VTP recipients, for testing and feedback

anyone i'm forgetting, please email to remind me!