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If so, Google Earth Enterprise is likely the right fit as allows customers to build globes from their own imagery, photography & data and was designed to handle extremely large data volumes.
If not, consider Google Earth Pro, which uses the same global database of satellite imagery and mapping information as the free Google Earth product.

If so, Google Earth Enterprise is definitely the product to meet your needs. Google Earth Enterprise can run completely disconnected from the public internet. The server can be secured so that only authorized users can access your data. Please contact us for more details about your needs.
You can also use Google Earth Enterprise to layer your own secure vector data on top of Google's public database of imagery. For smaller amounts of vector data, then Google Earth Pro or Google Maps may be a better fit.
If so, you can realize the full potential of your existing investments in geographic information system (GIS) technology and data by using Google Earth Enterprise as a cost-effective means of providing an easy-to-access library of your GIS data to your organization's end users. Please contact us to learn more.