and bottom right comer, and inputting them into the program, 
later it will show the result of judgment. 
In this experiment, we choose two sides are all free-cloud areas 
can be seen from weather analysis. One region with geodetic 
coordinate 97°E,40°N for top left comer and 97.5°E,39.7°N for 
bottom right comer in Yumen of Gansu province. Another 
region with geodetic coordinate 116.32°E,39.92°N for top left 
comer and 116.43°E,39.87°N for bottom right comer in Beijing 
city. 
Running the programming and putting geodetic information of 
the two areas to judge the topography. Then the results are 
given. Vertical displacement of Yumen region is 2684.00 
meters while Beijing area has 31 meters vertical displacement. 
According to the definition of flat area, Yumen region is judged 
as a mountain area Beijing area is judged as a flat area. 
From the SRTM image data, it can be seen that certain 
hypsography exists in the south of Yumen, while Beijing is 
relative much more flat. These conclusions prove correctness of 
terrain judge programming. 
3.3 Area and cost analysis 
We didn’t do much work on these two stages for they are 
subjective conditions sometimes, and should be analyzed 
according to different situations. 
4. CONCLUSION 
This article mainly discusses how to select a geometric test 
range in China from weather and terrain view. Weather 
condition focus on cloud influence, it is a factor affects quality 
of satellite image. Terrain condition declares a flat area as a test 
range, and gives some reasons for this. Some experiments have 
been done for weather and terrain analysis to show the 
procedures of selecting a test range in China. Besides of these, 
area and cost which are mostly depending on subjective factors 
should also be considered in practice. 
In this article, only a rough analysis was done for choosing a 
test range. In the future, for the purpose of more accurate 
analysis, more details should be considered in the selection, 
such as atmosphere visibility, the GCPs’ arrangement in the 
area and how to defined flat area is proper for a satellite test 
range. 
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ACKNOWLEDGEMENTS 
During the research of satellite geometric test range selection in 
China, we gain lots of help from others. Thank Gene Dial, his 
emails give us plenty of instructions. Thank China 
Meteorological Administration to supply meteorological data. 
Thanks are due for the support from the National Basic 
Research Program of P. R. China (No:2006CB701302), the 
Natural Science Fund of P. R. China (No:40601084 and 
No:40523005), the Open Research Fund Program of the 
Geomatics and Applications Laboratory, Liaoning Technical 
University (No:2006004), the Open Research Fund Program of 
State Key Laboratory of Satellite Ocean Environment 
Dynamics (No:SOED0602), the Open research subject of Key 
Laboratory of Geo-informatics of State Bureau of Surveying 
and Mapping, China International Science and Technology 
Cooperation Project: High-Resolution Stereo Mapping Satellite 
(No:2006DFA71570). With those help, our research is able to 
go along propitious.