These allow to measure the cloud top temperature, which is a measure of height. These cloud durations are compared with point rainfall data. By means of multiple regression a first estimate of the rainfall field from the cloud durations is obtained. This result is then locally calibrated so as to match the rainfall point data measured on the ground. The methodology takes due account of the variation in solar angle and day length as a function of latitude and day of the year.
Processing is automatic and the methodology is such that very little additional input is required.
Results have been validated in various ways. Basic input as well as end products can be purchased. Check our dedicated web site earlywarning.nl . From red via green to blue increasingly wet.