Class 27 BUFR/CREX Non-coordinate location (horizontal 1) – – BUFR CREX TABLE DATA DATA REFERENCE ELEMENT NAME UNIT SCALE REFERENCE WIDTH UNIT SCALE WIDTH F X Y VALUE (Bits) (Characters) 0 27 001 Latitude (high accuracy) ° 5 25 ° 5 7 –9000000 0 27 002 Latitude (coarse accuracy) ° 2 15 ° 2 4 –9000 0 27 003 Alternate latitude (coarse accuracy) ° 2 15 ° 2 4 –9000 0 27 004 Alternate latitude (high accuracy) ° 5 25 ° 5 7 –9000000 0 27 010 Footprint axis 1 m 0 14 m 5 –1 –1 0 27 020 Satellite location counter Numeric 0 0 16 Numeric 0 5 0 27 021 Satellite sublocation dimension Numeric 0 0 16 Numeric 0 5 0 27 031 In direction of 0 degrees longitude, m 2 31 m 2 10 –1073741824 distance from the Earth's centre 0 27 079 Horizontal width of sampled volume m 0 0 18 m 0 6 0 27 080 Viewing azimuth angle degree true 2 0 16 degree true 0 5 Notes: (1) The alternate latitude 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 satellite location counter is calculated as: counter = superswath No. x 1000 + box No. x 10 + minibox No. (3) The satellite sublocation dimension is calculated as: dimension = minibox dimension + box dimension where: minibox dimension = lines x 1000 + spots x 100 box dimension = lines x 10 + spots (4) The value for descriptor 0 27 031 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. (5) Left-handed x, y and z axes have been chosen for descriptor 0 27 031.
Class 27 – BUFR/CREX Non-coordinate location (horizontal – 1) BUFR CREX TABLE DATA DATA REFERENCE ELEMENT NAME UNIT SCALE REFERENCE WIDTH UNIT SCALE WIDTH F X Y VALUE (Bits) (Characters) 0 27 001 Latitude (high accuracy) ° 5 –9000000 25 ° 5 7 0 27 002 Latitude (coarse accuracy) ° 2 –9000 15 ° 2 4 0 27 003 Alternate latitude (coarse accuracy) ° 2 –9000 15 ° 2 4 0 27 004 Alternate latitude (high accuracy) ° 5 –9000000 25 ° 5 7 0 27 010 Footprint axis 1 m –1 0 14 m –1 5 0 27 020 Satellite location counter Numeric 0 0 16 Numeric 0 5 0 27 021 Satellite sublocation dimension Numeric 0 0 16 Numeric 0 5 0 27 031 In direction of 0 degrees longitude, distance from the Earth's centre m 2 –1073741824 31 m 2 10 0 27 079 Horizontal width of sampled volume m 0 0 18 m 0 6 0 27 080 Viewing azimuth angle degree true 2 0 16 degree true 0 5 Notes: (1) The alternate latitude 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 satellite location counter is calculated as: counter = superswath No. x 1000 + box No. x 10 + minibox No. (3) The satellite sublocation dimension is calculated as: dimension = minibox dimension + box dimension where: minibox dimension = lines x 1000 + spots x 100 box dimension = lines x 10 + spots (4) The value for descriptor 0 27 031 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. (5) Left-handed x, y and z axes have been chosen for descriptor 0 27 031.
WMO306_vI2_BUFRCREX_TableB_en.docx