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Mapping without the sun
Zhang, Jixian

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
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.
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
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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.