ODM2 Variable Name Controlled Vocabulary ODM2 Working Group A vocabulary for describing the name of Variables. Topographic Wetness Index (TWI) Topographic wetness index (TWI), also known as the compound topographic index (CTI), is a steady state wetness index. It is commonly used to quantify topographic control on hydrological processes. Wikipedia https://en.wikipedia.org/wiki/Topographic_wetness_index Added to support Critical Zone Observatory (CZO) data use cases.