Field campaign A sampling event conducted in the field during which instruments may be deployed and during which samples may be collected. Field campaigns typically have a focus such as characterizing a particular environment, quantifying a particular phenomenon, answering a particular research question, etc. and may last for hours, days, weeks, months, or even longer. ODM2 Directive Type Controlled Vocabulary ODM2 Working Group A vocabulary for describing types of directives under which observations are made. Examples include projects, monitoring programs, campaigns, etc.