Class 28 BUFR/CREX Non-coordinate location (horizontal 2) – – BUFR CREX TABLE DATA DATA REFERENCE ELEMENT NAME UNIT SCALE REFERENCE WIDTH UNIT SCALE WIDTH F X Y VALUE (Bits) (Characters) 0 28 001 Longitude (high accuracy) ° 5 26 ° 5 8 –18000000 0 28 002 Longitude (coarse accuracy) ° 2 16 ° 2 5 –18000 0 28 003 Alternate longitude (coarse accuracy) ° 2 16 ° 2 5 –18000 0 28 004 Alternate longitude (high accuracy) ° 5 26 ° 5 8 –18000000 0 28 010 Footprint axis 2 m 0 14 m 5 –1 –1 0 28 031 In direction 90 degrees East, distance m 2 31 m 2 10 –1073741824 from the Earth's centre Notes: (1) The alternate longitude may be used when the computation of the position yields multiple solutions and there is no a priori way to distinguish between them. (2) The value for descriptor 0 28 031 has been chosen to be suitable for polar orbiting satellites in approximately Sun-synchronous orbits. Geostationary orbits would require greater data widths for distance and slightly less for speed. (3) Left handed x, y and z axes have been chosen for descriptor 0 28 031.
Class 28 – BUFR/CREX Non-coordinate location (horizontal – 2) BUFR CREX TABLE DATA DATA REFERENCE ELEMENT NAME UNIT SCALE REFERENCE WIDTH UNIT SCALE WIDTH F X Y VALUE (Bits) (Characters) 0 28 001 Longitude (high accuracy) ° 5 –18000000 26 ° 5 8 0 28 002 Longitude (coarse accuracy) ° 2 –18000 16 ° 2 5 0 28 003 Alternate longitude (coarse accuracy) ° 2 –18000 16 ° 2 5 0 28 004 Alternate longitude (high accuracy) ° 5 –18000000 26 ° 5 8 0 28 010 Footprint axis 2 m –1 0 14 m –1 5 0 28 031 In direction 90 degrees East, distance from the Earth's centre m 2 –1073741824 31 m 2 10 Notes: (1) The alternate longitude may be used when the computation of the position yields multiple solutions and there is no a priori way to distinguish between them. (2) The value for descriptor 0 28 031 has been chosen to be suitable for polar orbiting satellites in approximately Sun-synchronous orbits. Geostationary orbits would require greater data widths for distance and slightly less for speed. (3) Left handed x, y and z axes have been chosen for descriptor 0 28 031.
WMO306_vI2_BUFRCREX_TableB_en.docx