ODM2 Variable Name Controlled Vocabulary ODM2 Working Group A vocabulary for describing the name of Variables. Area, basal Basal area is the area of a given section of land that is occupied by the cross-section of tree trunks and stems at the base. The term is used in forest management and forest ecology. Wikipedia https://en.wikipedia.org/wiki/Basal_area Added to support Critical Zone Observatory (CZO) data use cases.