1、 Rec. ITU-R P.1510 1 RECOMMENDATION ITU-R P.1510 ANNUAL MEAN SURFACE TEMPERATURE (Question ITU-R 201/3) (2001) The ITU Radiocommunication Assembly, considering a) that information on annual mean surface temperature is needed for propagation modelling purposes; b) that the information is needed for a
2、ll locations of the globe, especially when regional or continental calculations are necessary, recommends 1 that the data in Annex 1 be used to obtain the annual mean surface temperature when no local data are available. For easy reference the data are also shown in Fig. 1. ANNEX 1 1 Surface mean an
3、nual temperature The data file ESATEMP.TXT contains the annual mean surface temperature (C) at 2 m above the surface of the Earth with a resolution of 1.5 in both latitude and longitude. The companion data files ESALAT.TXT and ESALON.TXT contain respectively the latitudes and longitudes of the corre
4、sponding entries (gridpoints) in data file ESATEMP.TXT. The data are from 0 to 360 in longitude and from +90 to 90 in latitude. For a location different from the gridpoints, the temperature at the desired location can be derived by performing a bi-linear interpolation on the values at the four close
5、st grid points. The data files can be obtained from the ITU Radiocommunication Bureau (BR). 2 Rec. ITU-R P.1510 1510-012525252525-10-10-10-10-10-10-10-10-10-100000000000000000000000000000101010101010 101010101010101010202020202020202020202020202020202020202020202020252525252525252525252525 25252525252525252525252525252525150 100 50 0 50 100 15080604020020406080Longitude (degrees)Latitude(degrees)FIGURE 1Annual mean surface temperature (C)
