Modified SURF Algorithm Research And Application In Mine Geographical Space Position Matching

Mineral resources are an important strategic material support, at the moment, the development and utilization of mineral resources has risen to the height of national security. In recent years, our country continues to intensify the development of mineral resources, mineral resources, digitization, information technology has also done a lot of fruitful work. Country has reserves of mineral resources, the development scale, mine life and so do a detailed investigation, and the mining reserves established spatial information database, the degree of accuracy of the information held by the state’s mining resources have also established a verification database mining rights registration database, statistical databases. However, while the number of database construction, the same mine due to their different properties, when the presence of different databases have occurred, and the management of different databases, use, maintain, update information is often not in the same department, so the minerals, mineral rights and other information there will be some of the more confusing operation.In 2007, the Ministry launched the "status quo National Mineral Resource Use Survey" project, as China’s reserves of mineral resources in Sichuan province, and its geographical position, the wide distribution of mineral resources, mining rights more. Since the Sichuan mountains Mian Heng, geological structure is very complex, and therefore more difficult to maintain mineral data management of each database, so large, it said the cause of its mine reserves are not allowed, not allowed to lose mine spatial location, etc. issues. Therefore, for this case in Sichuan Province conducted a survey in 2009 Utilization of mineral reserves, by the end of 2011, Sichuan Province, and the establishment of a fully completed verification database. According to documents issued under the Ministry of Land and Sichuan Provincial Department issued a work guidelines, verification database and reserves database comparison and analysis, the "Survey results" update to mineral reserves database for the country’s economic construction and macro minerals decision-making more detailed and accurate data to support the foundation.However, after the verification of the database, as the old part of the mine’s history, a lot of old mines in the exploration and exploitation activities in liberation, was also not established uniform national coordinate system to regulate the surveying and mapping work, after a few decades, due to historical reasons and documentation storage system is not perfect and other reasons, most mine mapping information has been lost or no deposit mine coordinate point information verification. Secondly, the level was limited to mapping and coordinate a unified national coordinate system is not perfect, many mines are made of local mapping data coordinates or independent coordinates from the establishment. When experienced decades of social development, the independent coordinate system some reference point, the flag information can not be found. Or by direct projection transformation parameters conversion method to convert the original maps of the mine when the current national administration and management on a map to some of the verification database mining, mine boundaries or shift the location to find out where the District within range, even some mining Sichuan Province has shifted to the external division. Again, the use of maps obtained by the method of this conversion, some mine, mine graphic pattern shape there is an error, and some mining and other topological errors exist overlapping positions. These problems led directly to the location, extent, shape error verification database space, resulting in the current political management of mine, "there are pictures and not mine, there is no mine map" of serious problems.To resolve this issue, land departments of Sichuan Province spent a lot of manpower and resources to carry out the clean-up of the various databases, comparison, verification and so on. However, a lot of manpower to mine-site verification by comparison, the work that is human and material cost, sometimes less good harvest results. Therefore, the above problem for a lot of research work carried out. SURF algorithm using improved use of existing data to address the geospatial position allowed mining, mining position offset, shift, gland and other issues, so that the management of mineral reserves more accurate data. The main research contents and results are mainly the following aspects:(1) Analysis of various technical mine DEM image matching, Sichuan old mine contour data to sort out the summary, mining DEM image matching method of forming.(2) Contour extraction layer data mining, the use of GIS spatial data processing techniques for processing the raw data to form a non-coordinate mine DEM spatial database and a high-precision image space coordinates DEM database.(3) Mine DEM image matching principle analysis, the SURF algorithm was improved to achieve high accuracy position matching mine DEM.