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Remote sensing geographic information system in Shanghai in the Highway Research

In a coordinate system with the coordinates of the affine coordinate transform by another coordinate system coordinates. Once the new mapping coordinates in place, you can directly access the necessary raster image, and even relative to the raster image into vector angle coordinate system can still accurately locate and correct the deflection angle, get the correct remote sensing images. This is very convenient to realize the application, the development is relatively easy to adapt to every situation and not become the next update of remote sensing images were limited. Shortcomings of the effort to establish 2.2_2.3 coordinate table corresponding raster image. Retrieval speed of the system need to consider the impact of efficiency, so the control table stored in computer and realize to be optimized to meet the demand for fast retrieval. By comparison, the program can be considered a close second is the practical application of the method is scalable and can better meet the geographic information system application development needs. 3 In determining the specific machine to achieve the core implementations, it has to try to achieve in the computer the practical application of remote sensing images. Taking into account the views obtained by remote sensing image file size, so even after cutting, compression treatment, still require considerable storage space, when in actual use the computer hardware requirements of juice quite high, indicating relatively slow speed of this, achieved in the design of the machine to take the following measures: ① According to the geographical parameters of remote sensing image file, the establishment of _-a raster image file and location coordinates of the control table, which records the electronic ground slightly Shanghai N. . 3200239SHANGHAIHIGHWAYS map (vector) mapping and remote sensing graph, that remote sensing image map of the location in Shanghai. The storage structure of the table and B + trees using two models to achieve fast retrieval of remote sensing images. ② a judge in the software settings module, users can set their own display and remote sensing graph is the zoom range of needs, such as: 1:200; the map is enlarged to more than the proportion of the value of this setting,[link widoczny dla zalogowanych], the display of remote sensing map; the map be reduced to less than the value, the automatic shut down of remote sensing graph displayed. ④ According to the image file and location coordinates of the control table to determine the current range of intelligent display which should be pieces of remote sensing images, rather than show all remote sensing images in order to speed up the display and system operation speed. ④ read the conversion of remote sensing map coordinates will be the need to display raster images into memory and displayed in the right place; when the number of raster memory exceeds the limit value. Will not need to display raster purged from memory, thus reducing the hardware overhead. ⑤ Shanghai highway by a variety of geographic information system is closely related with the specific applications of electronic maps (vector) layer structure, each layer are reflected in the management of the business information you need to know in order to facilitate geographic features practical application of remote sensing images placed in the administrative divisions above the electronic map, road map under the electron layer ⑥ According to the administrative divisions of Shanghai, will be fully remote-sensing image files are classified according to districts this way, you can use county highway departments significantly reduce system overhead, clear the way for practical applications,[link widoczny dla zalogowanych], 4 Conclusion 4.1 40 on achieving good results after the slightly trampled N. . 32002 Highway in Shanghai,[link widoczny dla zalogowanych], the introduction of remote sensing images of geographic information, geographic factors have greatly enriched the information generated and the intuitive display greatly enhanced. In taking the second implementation of the development program in this article, the system actually performed well, better to achieve the desired goal. The system into practical use, for highway planning, construction and management more scientific and advanced methods to provide an intuitive basis for decision-making. 4.2,[link widoczny dla zalogowanych], 4.2.1 to be further addressed the color distortion due to the photo processing remote sensing technology limitations, this remote sensing images obtained was reddish in color, especially red and green have become, it does not meet the observations of the real world. Can take to improve current technologies and measures can be divided into two types: ① color raster images calculated in accordance with RGB color, reduce red (ie, R value), to improve the green part (the G value); ② the gate Lattice image of the color saturation by HUV treatment to improve H value. However, the actual effects are not ideal, full size side green, red and losses. 4.2.2 Remote Sensing figure disproportionately large remote sensing images obtained by the present ratio of 1:50,000, so the image can only meet the rough proportion of the more macro-planning needs. If the remote sensing images in order to obtain further detailed information on geographic features, such as the surrounding buildings and so on, then obviously the definition is not enough, can not meet the requirements of practical work. Suggested that further organization of force, shooting a small proportion (1:2000) for remote sensing image clearer and better meet a variety of different uses, different levels of application requirements
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