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Lanzhou, China

Liu X.K.,Zhengzhou University | Chen K.,68029 Troops | Li B.,Henan University of Technology
Applied Mechanics and Materials

Huffman coding is a statistical lossless coding method with high efficiency. The principal and implementation of Huffman coding is discussed and Huffman coding is implemented to the compression of vector maps. The property of the algorithm is discussed. Experiments demonstrated that the algorithm proposed can compress vector maps with high efficiency and no loss. © (2013) Trans Tech Publications, Switzerland. Source

Yang K.,Zhengzhou Institute of Surveying and Mapping | Shi R.,Zhengzhou Institute of Surveying and Mapping | Wang M.,68029 Troops | Zhou X.,Zhengzhou Institute of Surveying and Mapping
Advanced Materials Research

With the development of fluorescent technology, the application area of fluorescent material is expanding, which includes the fields of traffic, national defence, architecture, detection, decoration etc. In the field of printing, whether in the value of utility or view and admire, fluorescent adds tremendous energies. However, a majority of fluorescent materials used nowadays contain radioelement, which will do harm to human health. This paper considers the needs of fluorescent map printing, according to the defects of traditional fluorescent material such as low brightness, short duration time, strong radioactivity, limitation to spot color printing etc. It improves the capability of long fluorescent lag material and makes red, blue, green and yellow long fluorescent lag materials. Meanwhile, it tests the influence of ink thickness, illumination time and granule size etc. on irradiance capability. The thicker the ink is, the longer of the lag time will be. The bigger the granule size is, the lag time will be. It also tests its radioactivity extent, which is in the safety range and reaches the standard of environmental protection. According to the special requirement of map printing, this paper brings forward the technique scheme of the application of long fluorescent lag ink in map printing,which realizes the color fluorescent map printing. Source

Hao H.,68029 Troops | Feng J.,63869 Troops | Wang J.,68029 Troops
Journal of Geomatics

This paper analyzed the key technology of Google Earth. The 1:2 000 topographical map surveying program of Jiuquan Wind Power Generation base is carried to introduce the using of Google Earth in field aero photogrammetry. And it is explained how to come true the function of file input and output. At last, some experience and suggestion of the using in application are given. Source

Wang J.,68029 Troops | Ma H.,68029 Troops | Yue Y.,68029 Troops | Han H.,68029 Troops
Journal of Geomatics

In order to improve the efficiency of updating navigation data, the design and realization of navigation data collecting and updating system was studied. This system selects VS. NET as development platform, positioning data of BDS as support, ArcGIS Engine-Component GIS as the GIS software, C# as develop tool, which can make map data update easily and accurately. This paper focuses on the process of system function design and realization. Source

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