Adapters

Because we want to acquire imagery from different providers, eventually, and because data from even USGS is heterogenous, adapters are used to encapsulate the process of acquiring imagery. An adapter is responsible for accepting an ImageryRequest and producing one or more JobBundles to be run through the pipeline. It also may be responsible for implementing certain provider-specific transformations, like snapping sensor data to RGB ranges or computing image names so that symbolic names can be used instead.

The DummyAdapter is implemented only for testing purposes, while the UsgsAdapter encapsulates acquisition of LANDSAT imagery.