Data package for opportunistic constant target matchup study

Opportunistic constant target matching is a new method for satellite<br> intercalibration. It is complementary to the traditional simultaneous nadir overpass<br> (SNO) method because it can provide warm matchups in cases where the<br> SNO method provides only cold matchups. A geostationary infrared sensor (SEVIRI) is used to select constant<br> target matches for two different microwave sensors (NOAA 18 and Metop<br> A). This is the data package for a publication where we discuss the<br> main assumptions and limitations of the new method and explore its<br> statistical properties with a simple Monte Carlo simulation and with<br> real observations from NOAA 18 and Metop A.