X3D-Earth: Full Globe Coverage Utilizing Multiple

Datasets

Dale R. TourtelotteLT, USN

X3D-Earth

All the benefits of X3D:– Open ISO Specification– Choice of implementations and tools– Scripting capabilities– Powerful browsers

Geospatial accuracy (WGS84, UTM, etc.)True mapping of 3D Geospatial coordinates to X3D’s Cartesian X, Y, Z coordinates

Dr. Chris Thorne and Rez

•“Open source framework and tools for translating gridded data, mainly geospatial, to different formats including images and multiresolution models for X3D or VRML web browsing”

•Java program with multiple input/output plugins

•Can be executed using a GUI or command line

Rez (cont.)

•Inputs• DTED• ASCII Grid• XYZ• DEM• GeoVRML Elevation Grid

•Outputs• X3D• VRML• Contoured Jpg• Grey Scale Jpg

Dr. Yoo and X3D-Earth

•Terrain Tile Production Chain• Developed a method for generating X3D-Earth

scenes from freely available sources• Uses a commercial software, GlobalMapper, to

retrieve and convert the data• Uses an opensource software, Rez, to parse

data and generate X3D-Earth Terrain Tile pyramids and Imagery Pyramids

Terrain Tile Production Chain

Dr. Yoo (cont.)

•Low Resolution Globes• He used the Terrain Tile Production Chain

method to generate Low Resolution Globes

My Background

•Surface Warfare Officer

•Last Job – Navigator on DDG in Norfolk, VA

•Deployments – Navigated into 18 Foreign Ports, 5 major Strait transits, and over 25,000 Nautical Miles

•Needed a 3D tool for entering/exiting Foreign Ports

California Demo

Terrain – DTED Level 0 – 1km resolution

•Input•Files = 111 .dt0 files•Size ≈ 4MB

•Output•Files = 37851 .x3d files•Size ≈ 65MB

California Demo

Imagery – NaturalVue 15m resolution

•Input•Files = 111 .dt0 files•Size ≈ 2700MB

•Output•Files = 37851 .jpg files•Size ≈ 2600MB

Globe

Terrain – DTED Level 0 – 1km resolution

•Input•Files = 25,594 .dt0 files•Size ≈ 1.6GB

•Output•Files = 8,727,554 .x3d files•Size ≈ 34GB

Globe

Imagery – NaturalVue 15m resolution

•Input•Files = 3075 GeoTiff files•Size ≈ 3.4TB ≈ 218GB as .jpg

•Output•Files = 6,046,953 .jpg files•Size ≈ 342GB

Pitfalls and Lessons Learned•Choice of Image Formats• Two Formats received from NGA• JPEG-2000 – Limited support in Java• GeoTIFF – Not supported by Rez ImageSlicer

•Use of Java to manipulate Image files• Out of Memory Issues

•Capability Gap of Rez• Initial Tests and Included Examples “proved” the

capability•Unknown limitations of Hamming Supercomputer• Maximum number of files for a File System

Other DemosMV4205 ProjectMV3204 Project

Questions??

http://www.web3d.org/x3d-earth/http://x3d-earth.nps.edu/

Dale R. Tourtelottedrtourte@nps.edu