Please answer the following question: China news, Oct. 26--China Great Wall Society's secretary-general Zhang Ji says that the Chinese Academy of Social Sciences (CASS) would join hands with the Society to produce a 3D picture of the Great Wall so that _ could view its original looks. When the website opens, a picture of the revolving earth will appear against the background of the universe. A click on the Great Wall will bring the earth nearer, and slowly a white line is seen across the Chinese land in the north. A closer view shows that this is the Great Wall. Netizens will be able to appreciate the Great Wall with the eye of a tourist and "walk" from Shanhai Pass in the east of the Great Wall to Jiayu Pass in the west in just a couple of days. They can also take a look at the mineral resources and economic status of regions along the Great Wall. CASS and the Great Wall Society are trying their best to make this dream come true through working together closely. According to Zhang, to achieve the above effects, scientists will rely on airborne remote sensing, national geographical information system and global positioning system to collect detailed data of the Great Wall, analyze and process the data, apply them to satellite images for 3D translation, and thereafter create a 3D digital image of the Great Wall for the entire world to appreciate the really great Great Wall of China via the Internet. The scientists will rely on the following except _ to collect detailed data. A) airborne remote sensing B) national geographical information system C) global positioning system D) satellite images
Answer:
D