The following table is based on that given in WMO publication no. 306 - Manual on Codes. The information is believed to be correct. However, the definitions in the WMO manual may be liable to change over time. If there is a difference between the information here and in the WMO manual, the WMO manual is the definitive source.

## WMO Code Table 6 - data representation type

Value | Meaning | gridType | Comment
--- | --- | --- | ---
0 | Latitude/longitude grid - equidistant cylindrical or Plate Carree projection projection | regular_ll reduced_ll | - regular_gg for ksec2(17)=0 - reduced_gg for ksec2(17)=1
1 | Mercator projection | mercator |
2 | Gnomonic projection |  |
3 | Lambert conformal, secant or tangent, conical orbipolar, projection | lambert |
4 | Gaussian latitude/longitude grid | regular_gg reduced_gg | - regular_gg for ksec2(17)=0 - reduced_gg for ksec2(17)=1
5 | Polar stereographic projection | polar_stereographic |
6 | Universal Transverse Mercator (UTM) projection | UTM |
7 | Simple polyconic projection | simple_polyconic |
8 | Albers equal-area, secant or tangent, conic or bi-polar, projection |  |
9 | Miller's cylindrical projection |  |
10 | Rotated latitude/longitude grid | rotated_ll |
11- 12 | Reserved |  |
13 | Oblique Lambert conformal, secant or tangent, conical or bipolar, projection |  |
14 | Rotated gaussian latitude/longitude grid | rotated_gg |
15 - 19 | Reserved |  |
20 | Stretched latitude/longitude grid | stretched_ll |
21 - 23 | Reserved |  |
24 | Stretched gaussian latitude/longitude grid | stretched_gg |
25 - 29 | Reserved |  |
30 | Stretched and rotated latitude/longitude grid | stretched_rotated_ll |
31 - 33 | Reserved |  |
34 | Stretched and rotated gaussian latitude/longitude grid | stretched_rotated_gg |
35 - 49 | Reserved |  |
50 | Spherical harmonic coefficients | sh |
51 - 59 | Reserved |  |
60 | Rotated spherical harmonic coefficients | rotated_sh |
61 - 69 | Reserved |  |
70 | Stretched spherical harmonic coefficients | stretched_sh |
71 - 79 | Reserved |  |
80 | Stretched and rotated spherical harmonic coefficients | stretched_rotated_sh |
81 - 89 | Reserved |  |
90 | Space view, perspective or orthographic | space_view |
91 - 191 | Reserved |  |
192 | ECMWF ocean data |  |
193 - 254 | Reserved for local use |  |