MWS A Spot

New version of EPS-SG MWS test data released


MWS A Spot
MWS A Spot

A new version of EPS-SG Microwave Sounder (MWS) L1B and L2 data (V2) has been released for format familiarisation.

Last Updated

17 December 2021

Published on

17 December 2021

This release is an update to a previously delivered MWS L1B and L2 test dataset (V1) that was released to users in December 2019.

The MWS (Microwave Sounder) has a direct heritage from the microwave instruments AMSU-A (Advanced Micro-wave Sounding Unit A) and MHS (Micro-wave Humidity Sounder) on board EPS and NOAA satellites. Its primary objective is to support numerical weather prediction (NWP) at regional and global scales by providing information on atmospheric temperature and water vapour profiles in clear and cloudy conditions.

Test data description

The test data is available here:

The MWS Level 1B test data contain the most important variables related to geolocation and calibration processing. The MWS L1B product, in netCDF format, is generated using the MWS L1B in-house prototype processor (IPP) developed at EUMETSAT. The MWS Level 2 test data are generated with the MWS L2 IPP using L1B data as input. The L2 data, in netCDF format, contain the geolocated total precipitable water (TPW) over water-surfaces, and limb-corrected brightness temperatures for all 24 MWS channels.


The new version of the test data follows the most recent versions of the documentation:

EPS-SG MWS Level 1B Product Format Specification (v4B)
EPS-SG MWS Level 2 Product Format Specification (v4A)
Generic Product Format Specification (v4).

Note: all old versions are obsolete for format familiarisation purposes.

Additionally, the new version of the test data covers four orbits of data and provides test data for non-nominal cases. The Readme file gives more details on the data package.

MWS Chanel 1 TOA Brightness Temp
Figure 1: Data example

These test data are only intended for format familiarisation and system testing.

For more information and feedback on the test data, contact our User Service Helpdesk.