Interoperability, power supply, and system maintenance are three important topics for field observation. Technologies associated with the Internet of Things (IOT) and 5G have great potential for field observation system improvement. In this manuscript, we discuss the architecture of field observation in the 5G era. Gateway, syntax and semantic interoperability are important aspects for system performance improvement. We developed a low-power data collector with sensing, communication, and power supply components, and we introduce our initial study on a real-world environment observation system implementation and experiment.