Overview

Primary Modules

• Base - Basic classes and functionality shared across modules
• dBase - dBase read support
• Shapefile - Read support for ESRI Shapefiles
• GIS/Physics - Geographical and Physics functionality
• KML - Write support for the KML format
• jDem846 Core - Primary class for data input, rendering, projects, etc.
• UI - Primary graphical user interface for jDem846

Input Support

Elevation Raster

• GridFloat
• BIL INT16

Shape Files

• ESRI Shapefiles

Data Files

• dBase (just enough to support the shapefiles)

Scripting

• Integrated scripting is available which allows for injecting additional logic into several points of the rendering process.
• Supported Languages:
  • Groovy
  • Scala
  • JavaScript

Output Support

• PNG/JPEG
• KML (needs reimplementation)
• Data raster conversions/exports (planned)

Status Summary

Overview

jDem846 is in relatively early in it's development stages. Some components may come with varying levels of stability.

2D Projection

• Elevation modeling is in good shape
• Shapefile support is very early in development
• Error checking is minimal and needs expansion

3D Projection

• Most structures are in place
• Projection algorithm still needing some tweaking

Spherical/Global Projection

• Most structures are in place

KML Output Support

• Needs significant update following API changes
• Requires additional options not yet on the model config panel
• Does not yet utilize shapefiles
  • Should shapes be rendered on top of the tile images?
  • Should shapes be converted to KML polygons?

Hardware Rendering With OpenGL

• Implementation is in progress, about 75% usable.

C++ Native Library

• I created a native port of the jDem846 algorithms and data structures in C++ which is considerably faster and more memory efficient. Needs fine tuning and Java native tie-in. This code is not yet publicly available.

New User Interface

• A new user interface is in development that uses the Eclipse platform. This new UI will be much more stable, professional looking, and easier to use.

Render Performance

• Rendering is not particularly fast. This is due to the current reliance on memory mapped files for storing most of the huge data sets that are worked with. Doing this adds considerable disk IO overhead. One workaround is to modify the maximum heap buffer size in the preferences to a larger size, but this will require a larger configured JVM max heap size and will quickly overrun the integer-based indexing Java uses for arrays (The MMap'd files use longs for indexing). Also recommended is the use of a solid state hard drive which reduces disk seek times. In the future I do plan to add smarter memory caching of data to reduce the constant read/writes from disk

Screenshots:

http://googledrive.com/host/0B5gEWNRhmLMTSlhZbnJxRmM4QVU/jDem846 Eclipse UI - Screenshot Feb 18 2013.jpg' title='jDem846 Screenshot'>http://googledrive.com/host/0B5gEWNRhmLMTSlhZbnJxRmM4QVU/jDem846 Eclipse UI - Screenshot Feb 18 2013.jpg' alt='jDem846 Screenshot - Model Rendered' width='500' height='329' />

Example usinghttp://www.gebco.net/'>GEBCO_08 Dataset:

http://www.flickr.com/photos/kevinmgill/6790302628/' title='GEBCO_08 with Shaded Blue Marble Landmass by Kevin M. Gill, on Flickr'>http://farm8.staticflickr.com/7066/6790302628_0d94375c62.jpg' alt='GEBCO_08 with Shaded Blue Marble Landmass' width='500' height='250' />

Examples of Spherical Projection

Model Enhanced By Integrated Scripting

http://www.flickr.com/photos/kevinmgill/8165909516/' title='A Living Mars: A Visualization of Mars, Very Much Alive by Kevin M. Gill, on Flickr'>http://farm9.staticflickr.com/8342/8165909516_f0a83395bf.jpg' alt='A Living Mars: A Visualization of Mars, Very Much Alive' width='500' height='500' />

Visualization of a Living Mars

http://www.youtube.com/watch?feature=player_embedded&v=7RSY37H_sFU' target='_blank'>http://img.youtube.com/vi/7RSY37H_sFU/0.jpg' width='500' height=369 />

Ray Traced Shadows Animation

http://www.youtube.com/watch?feature=player_embedded&v=rzlnlmkXZIY' target='_blank'>http://img.youtube.com/vi/rzlnlmkXZIY/0.jpg' width='500' height=369 />

Ray Traced Shadows Animation Using Satellite Imagery

http://www.youtube.com/watch?feature=player_embedded&v=7ztM0dpel0M' target='_blank'>http://img.youtube.com/vi/7ztM0dpel0M/0.jpg' width='500' height=369 />

jDem846 Model Used as a Google Earth Layer:

http://www.flickr.com/photos/kevinmgill/6200730720/' title='jDem846 Example: KML Support, Google Earth by Kevin M. Gill, on Flickr'>http://farm7.static.flickr.com/6013/6200730720_ee3c58c01a.jpg' alt='jDem846 Example: KML Support, Google Earth' width='500' />