Thank you for your willingness or interest to provide surveillance data to EMADDC. The data format supplied by ATS ANSPs can be one of the following ASTERIX types:

• ASTERIX CAT048
• ASTERIX CAT062

An alternative is to provide the data in ASCII format but this is not the preferred option of the EMADDC team.  

The EMADDC team has a strong preference to receive ASTERIX CAT048 over ASTERIX CAT062. The reason being the lower resolution of the MACH number in ASTERIX CAT62 which in turn reduces the quality of the derived Temperature. EMADDC can process both ASTERIX formats.

If only ASTERIX CAT062 can be provided the Mach number could also be provided at higher resolution in CAT062 I062/380 subfield #4. Also, the EMADDC team would like to know which interpolation method is used by the radar tracker as often interpolation between raw observations results in a lower quality of the derived meteorological data.

For both formats the fields below are normally filled by ATS and decoded by the EMADDC software.

In order to fill these fields BDS 4.0, BDS 5.0 and BDS 6.0 are required and need to be interrogated. If available, BDS 4.4 MRAR reports are also requested and are processed by EMADDC.

Data can be supplied via SFTP to the KNMI EMADDC SFTP server or via NewPENS as of 2022, noting that NewPENS likely exchanges ASTERIX CAT062 only.

Before EMADDC can process ASTERIX data the EMADDC processing requires radar detail information to calculate the position of the aircraft observations. For that reason the EMADDC team requests data suppliers to provide a file containing the following information of each radar present in the data provided:

• Radar SAC (System Area Code)
• Radar SIC (System Identification Code)
• Radar Latitude
• Radar Longitude
• Radar Elevation (including radar height) above MSL

The tables below show the possible content of the data for CAT048 and CAT 062.