International Soil Moisture Network

The International Soil Moisture Network (ISMN) provides free access to long-term, harmonised and quality-controlled in situ soil moisture observations, covering the near-surface zone down to the deep-root zone. These observations are collected from around 3.000 sites belonging to various organisations that supply ISMN with data on a voluntary basis. Other relevant hydrometeorological variables such as rainfall and temperature are also stored in the database. Services provided by ISMN have made a major contribution towards calibrating/validating and improving global satellite soil moisture products and land surface models.