My organization is quite a medium-large organization (5,000 employees) and is facing some severe budget cuts. Resources are sparse and we are looking at using cloud-based service for our Base-mapping tiles as we do not have the resources to update and cache base-maps internally, let alone regularly. The cloud-based services look appealing due to the fact that data management is done elsewhere and base-maps are always up-to-date without us having to do anything. Of course it comes at a cost, and the cost varies based on number of usage / tile transactions per year.
At the moment, GIS usage is limited to a certain number of staff within the organization and is only desk bound. We are rolling mobiles and will allow all our staff to access our web-mapping applications, so usage will probably dramatically increase. I have no idea how I can work out the oragnisation's yearly usage in order to build a business case to procure such a service or even compare it with paying consultants to create a cache for us and internally serve it.
Is there a way of estimating the tiles used based on the size of the area my organization cover and the number of staff?? I can't find a tool which helps calculate that. Does anybody know of a good methodology?