A field campaign is a focused research effort that takes place outside of a laboratory or controlled environment, usually in a specific geographical location. It typically involves a team of researchers collecting data and conducting experiments in order to answer specific scientific questions or test hypotheses. Field campaigns can range from short-term studies lasting a few days to long-term projects lasting weeks or even months. They often involve collaborations between different research institutions, and may utilize a variety of tools and techniques, such as remote sensing, sampling, and instrumentation. The goal of a field campaign is to gather real-world data and observations that can be used to improve our understanding of a particular phenomena or process.