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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B5. Beijing 2008 
database, affirm the distribution and attribute of the MGW in 
the filed by filed investigation, such as locating the main 
inflexion of the MGW by the GPS handset, expressing the 
investigation information on the aerial enlarge photo, etc., fill in 
10 kinds of resources investigation forms to record the attribute 
of the wall, and measure three-dimensional coordinates of each 
inflexion points on the surface centre line of the MGW by 
photogrammetry with the 1:10k specification precision. 
The technological test results being done in Hebei, Beijing and 
Gansu, show that the technological method is effective and 
feasible. Now, 10 provinces along the MGW has been using the 
method to carry out the measurement of the MGW. 
The expected measurement results obtained by the method will 
include the length of the MGW, such as surface length, 
projection length and categorised lengths, the stripe geo-image 
with lm resolution, DEM with 5m grid interval, the MGW 
thematic data, the MGW thematic image map, etc. 
ACKNOWLEDGEMENTS 
The authors would like to thank Dr.Liu Wanzeng for his help in 
obtaining the length calculation formula, and Dr.Chen Lijun and 
Peng Shu in terms of doing photogrammetric measurements. 
The authors also appreciate the contributions of Hebei 
Provincial Bureau of Surveying and Mapping and Gansu 
Provincial Bureau of Surveying and Mapping and Beijing 
Institute of urveying and Mapping for doing the test. 
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