On the use of ICESAT-GLAS measurements for MODIS and SEVIRI cloud-top height accuracy assessment
Article first published online: 13 OCT 2005
Copyright 2005 by the American Geophysical Union.
Geophysical Research Letters
Volume 32, Issue 19, October 2005
How to Cite
2005), On the use of ICESAT-GLAS measurements for MODIS and SEVIRI cloud-top height accuracy assessment, Geophys. Res. Lett., 32, L19815, doi:10.1029/2005GL023275., , and (
- Issue published online: 13 OCT 2005
- Article first published online: 13 OCT 2005
- Manuscript Accepted: 19 SEP 2005
- Manuscript Revised: 10 AUG 2005
- Manuscript Received: 18 APR 2005
 This study reports on the first attempt to use cloud boundary and optical depth retrievals from the GLAS lidar to assess the accuracy of cloud-top heights obtained with MODIS (onboard NASA-TERRA and AQUA) and SEVIRI (onboard METEOSAT-8). Over the period from 25 September to 18 November 2003, MODIS-GLAS coincidences were only found in the Polar Regions, whilst SEVIRI-GLAS coincidences were available for a larger range of latitudes. For both passive instruments, cloud-top heights were overestimated by about 300–400 m when clouds were low and opaque. For high and thin clouds, MODIS and SEVIRI cloud-top heights were underestimated, and the bias increased with decreasing optical depth. For optical depths below 0.3, the number of misdetections increased significantly and the bias in cloud-top height increased from 1 to 2 km. The bias was found to be larger when lower cloud layers were present.