Meteosat-8/9 Effective vs Spectral Radiances

Beginning in April 2008, EUMETSAT will start sending Effective Radiance in MSG Level 1.5 Image Products (Meteosat-8/9). This will replace the existing Spectral Radiance. Further details can be found in the EUMETSAT publication: A Planned Change to the MSG Level 1.5 Image Product Radiance Definition

Sample McIDAS area files for 17-Jan-2008 00:45 and 13:00

• Effective Radiance
• Spectral Radiance
• FTP Instructions

Use the McIDAS command DSSERVE to create a datasets containing the above files. For example:

• DSSERVE ADD TESTMSG/EFFECTIVE AREA DIRFILE='/home/mcadde/mcidas/data/msg_cal/effective-17-JAN*'
• DSSERVE ADD TESTMSG/SPECTRAL AREA DIRFILE='/home/mcadde/mcidas/data/msg_cal/spectral-17-JAN*'

Required Code Changes

The module kbxmsg.dlm needs to be updated to read in the larger calibration block in the sample area files. A fastrack prior to April, will include necessary updates to the MSG servers to correctly write the new calibration block. Instructions for installing updated version of kbxmsg.dlm:

• backup/rename the file kbxmsg.dlm in the directory ~mcidas/mcidas2007a/src/.
• Download the new version of kbxmsg.dlm to the ~mcidas/mcidas2007a/src/ directory.
• Rebuild applications by running the following commands from /home/mcidas:
  • sh ./mcidas2007a.sh make
  • sh ./mcidas2007a.sh install

The McIDAS User Services has done some preliminary tests to show the differences between the two radiance type for Meteosat-9 17-Jan-08 00:45

Statistical Analyses