1. An occurrence-data archival system, comprising: a computing device operable to communicate with an archival data storage and with remote data storage devices; and instructions that cause the computing device to perform a process, including: receiving one or more mote data sets from at least one of the remote data storage devices, each respective mote data set of the one or more mote data sets representing a respective feature sensed by a given mote, the respective feature having a correlation to a reference as determined by the given mote, at least one instance of mote data of the received one or more mote data sets including an associated tentative occurrence-identifier having been assigned by the given mote, wherein the receiving includes: receiving at least a portion of multiple instances of mote data that were sensed by the given mote before or after the mote data that includes the associated tentative occurrence-identifier responsive to the assignment by the given mote of the associated tentative occurrence-identifier; and storing the received one or more mote data sets in the archival data storage.