Understanding two important features of GIS applications such as TVDI will make your work much easier.  
     
 

Scale Dependency
Because TVDI contains so much information, particular data sets are only viewable at certain scales. Without this feature, all the symbology would overlap making the map impossible to read. The chart further down this page shows the scale levels at which each vendor's data can be viewed. You can tell a data set is available to view when its checkbox appears. Use the Zoom functions to change the scale level.

Refresh
When working in TVDI, you are connected to an Internet mapping service that links many types of data to features on the map. Each time you select a map feature or data set in the data layer tree you must click the Refresh button to update the links in what you are viewing.
     
 
 
 
     
 
Scale Levels to View Data
World Level
  Tobin International - Tobin Global Planner
WesternGeco - 2D grid, 3D area
TGS/NOPEC - 2D grid, 3D seismic
   
United States Level
  Tobin International - Culture 24k and 100k, Digital Leases, Ownership, Survey, TopoVue, OV25
Seismic Exchange Inc. - 2D grid, 3D seismic
Seisco - 2D lines
Seitel Data - 2D grid lines, 3D onshore
   
County Level or Less
  A2D - Wells
IHS Energy - Wells
Tobin International - Wells
Seisco - 2D lines
Seitel Data - 2D lines
TGS/NOPEC - 2D seismic Lines
WesternGeco - 2D lines
   
Offshore - Gulf of Mexico Area
  PGS - 3D Areas, 3D4C Areas
Seitel Data - 3D Offshore
TGS/NOPEC - 2D seismic grid, 3D seismic GOM
World base layers - Gulf of Mexico, offshore area, offshore block
   
 
 

This list provides the best level in which a user can view a particular vendor's entire data set represented as a data layer.

If a data layer is listed at the county level or less, it can not be seen in the higher levels. However, a layer listed in the World or United States Levels can be seen in lower levels as well.

Minimum System Requirements
Internet Explorer 5.5 or higher and Java Runtime Environment 1.3.1_02.

Why Use JRE (Java Runtime Extensions)?
The Java Runtime Environment (JRE™), including the Java Plug-in component for running Java applets in your web browser is required to use the Demonstration.

You can ‘Click Here’ to see if you currently have the JRE installed and if so, the version information as well.