An RDD of K, Byte-Array pairs (where the byte-arrays contains image data) to send to S3
A function that maps each key to full s3 uri
A function which returns an S3 Client (real or mock) into-which to save the data
A Layer ID
The template used to convert a Layer ID and a SpatialKey into an S3 URI
A functon which takes a spatial key and returns an S3 URI