171 
Table 4 : Meteorological data of Dunhuang city.(1956 -1980) 
Meteorological 
factors 
Month 
Year 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
Fine days (days) 
11.4 
7.6 
4.4 
4.2 
5.4 
7.0 
6.9 
11.1 
11.7 
14.8 
11.0 
11.4 
107.4 
Precipitation (mm) 
0.8 
1.6 
1.2 
7.9 
1.6 
4.7 
12.1 
5.3 
1.8 
1.0 
1.1 
0.7 
36.8 
Relative humidity (%) 
50 
42 
32 
32 
32 
38 
43 
43 
42 
41 
48 
53 
41 
Temperature (°C) 
-9.3 
-4.1 
4.5 
12.4 
18.3 
22.7 
24.7 
23.5 
17.0 
8.7 
0.2 
-7.0 
9.3 
Atmospheric pressure (hPa) 
894 
891 
888 
885 
883 
880 
878 
881 
886 
891 
895 
895 
887.2 
Sand & dust storms Average 
Maximum 
0.9 
1.4 
2.8 
0.4 
2.3 
2.3 
1.6 
1.5 
1.0 
0.3 
0.4 
0.8 
15.8 
4 
4 
8 
6 
7 
5 
5 
4 
2 
2 
4 
3 
30 
4 - CONCLUSION 
After a careful analysis and comparison of all information material obtained, it has been primarily decided to 
set the radiometric calibration test site for satellite sensors at Germo west Gobi and Dabson Salt Lake in 
Qinghai Province and Dunhuang Gobi in Gansu Province, both in north western part of China. Further 
measurement tests and analysis and a theoretical work is undergoing and developing and the practical 
establishment of the site is being planned. The necessary laboratory and field measurement and calibration 
equipment is under preparation and collection.