Atmospheric Effects on 35-Day Repeat Cycle ERS Interferograms of London
Jon Leighton(1) , Andrew Sowter(1)
, and Mark Warren(1)
University of Nottingham,
Nottingham NG7 2RD,
Atmospheric artifacts are possibly the most damaging source of errors affecting an interferogram. The effects can range from small localised delays to those that affect a whole interferogram. As the atmosphere is changing constantly with time, the effects also tend to increase as the temporal separation between the two interferograms making up the interferogram increase. In this paper we look at a series of ERS 1-day and 35-day repeat cycle data gathered from 1995-1999 over the London area and try to extract the atmospheric effects from the data using a reference DEM. The results are compared with optical remotely sensed AVHRR imagery, ground based measurements of water vapour, such as those derived from GPS measurements, and other synoptic data from weather stations.