An obvious question that drops out of yesterday’s post on the right file format to use to distribute large raster files is, “How do you distribute a 40 GB file?” The distribution of a single 40 GB file would overwhelm the bandwidth of many small businesses. That was one of the reasons we originally developed the WeoGeo Server.

Figure 1. WeoGeo Server (click on the image to see more information)

The Server allows the mapping organization to distribute customer-defined customized products that would reduce the required file size, and thus bandwidth, to satisfy their customers’ demand. However, there is still the use case where the customer wants the whole file.

Since FERI is a small business, we couldn’t have our daily research activities impacted by an imagery request. So the first (obvious) step was to develop a customization and distribution system that processes a data request in an asynchronous manner, i.e. the order is taken during business hours, but it is processed and delivered after business hours. This allowed us to optimize our bandwidth in our labs and still reasonably satisfy customer demands (assuming they did not need instantaneous data delivery). We also tweaked the system to allow some small files and all of our own requests to be processed immediately, while larger ones for external users were processed in the evenings.

The asynchronous data delivery is also a fundamental difference between our technology and online GIS servers. We optimized for discovery, customization, and ordering in a way that allows the customer to receive near-instant gratification on the discovery and ordering, while (possibly) delaying gratification on the delivery.

While the customization of product selection and the asynchronous processing and delivery bought us some additional help in terms of distributing large geospatial content files, it still did not help us with the problem of what to do with multiple requests for 40 GB image files. This is where some of my earlier posts, where I described our use of Amazon Web Services, begin to make some sense (and maybe why Jinesh digs what we are doing).

However, I am late for dinner, so I’ll pick up this theme on a later post…