Advanced Materials Research Vols. 864-867

Abstract: Differential synthetic aperture radar Interferometry has been widely applied to monitor mining subsidence for its high spatial resolution, competent accuracy and wide coverage. In this paper, we introduce the principles of InSAR, discuss several key technical issues in mining subsidence monitoring, including selection of SAR images, advanced algorithms for phase unwrapping and Persistent Scatterer InSAR technique.

Abstract: Based on the GIS technology, ETM date of 2000 and CBERS date of 2007 have been used as main data source in this paper.The dynamic degree and transfer matrixof wetland in the study area have been analyzed in order to clear the dynamic change of the wetland in liaohe river water system area in recent years.The results show that the wetland area in liaohe river region during 2000-2007 is obviously the volatility of the whole the increasing trend,the river area and offshore area and coastal wetlands area have been decreased,the areas with decreased river area is mainly distributed in the north of liaohe river region and central region.The areas with increased artificial wetland is mainly distributed in the north centre of liaohe river region. The increase of artificial Wetland and swamp meadow wetland area mainly comes from the transformation of non wetland area,the wetland types and changes of areas also have some correlation among the temperature and precipitation.

Abstract: The paper studies Terrestrial Laser Scanning used in subway tunnel deformation monitoring. For special narrow subway tunnel structure, the accumulated error between the adjacent station can be eliminated by global registration pattern which is to set the common control point within the section ends. Point cloud slicing is used to calculate the radius of the circle by multi-point coordinate, deformation is fitted to curve to show the monitoring result by analyzing the center coordinates sequence trends and mean curvature. Three-dimensional model of subway tunnel not only improves the accuracy of deformation monitoring, but also reflects the overall deformation trend. This method is applied to monitor deformation for Shanghai Metro Line twelve, comparing with the total station method, high precision of deformation monitoring meet the need.

Abstract: The Chlorophyll-a (Chla) concentration in Bosten Lake was estimated and mapped using the data of the Medium Resolution Imaging Spectrometer (MERIS) on board the ENVIronmental SATellite (ENVISAT) platform. The fixed aerosol option was chosen and local aerosol optical thickness was used in SeaDAS. The Chla concentration was retrieved by the OC3E algorithm and verified by Field data with high correlation coefficient of 0.79. It showed strong horizontal heterogeneities, which is high at the Huangshuigou region, mediate along the boundary area, and low at the middle of the lake, and decreases from the boundary to the center of the Lake. Its spatial distribution is controlled by the location of inlet and outlet and the type and quantity of discharging around the lake. On sep. 22, 2010, its value is up to 10.98 mg m^-3. The minimum, maximum, average and median value of Chla concentration on Aug. 6, 2011 from MERIS data in Bosten Lake is 2.72, 8.93, 3.90 and 3.69 mg m^-3.

Abstract: This paper deals with landslide hazards susceptibility assessment in the study area from Zigui to Badong counties in TGP reservoir region using RS and GIS technology. The causative factors including lithology, distance to faults, elevation, slope aspect, slope angle, drainage network, distance to river and distribution of plant are derived from geological map, Digital Elevation Model (DEM) and Spot imagery data using RS and GIS technology. The paper analyzes landslide susceptibility assessment using fuzzy weights of evidence method, which could combine knowledge-based fuzzy membership values with data-based conditional probabilities to improve the accuracy of landslide susceptibility assessment. The research result is very coincident with the occurrence of the known landslides in the study area.

Abstract: This article is based on three-dimensional laser scanning technology for the modeling of a chemical plant piping, scanned point cloud data with a lot of blunders, comprehensive analysis of the point cloud handling characteristics and stage of maturity of two-dimensional graphics. As a result, a concept of transforming the point cloud data with three dimensional to two-dimensional is formed. Then, according to point and circle positional relationship in the same plane, derived an Algorithm about Gross Error Elimination, finally, programming and achieve it.

Abstract: The urban land use and cover change (LUCC) through the biogeochemical cycle process affecting the city ecological environment, urban district LUCC is the key areas of LUCC research. Guiyang city is the typical karst plateau city of China and even the world, Karst natural background has vulnerability. So under the GIS support ,this article analysis land use/cover change dynamic of the Guiyang city from1990 to 2010, the results show that: (1) Guiyang city construction land area increased by 3.56 times in a short span of 20 years from 57km² in 1990 to 204 km² in 2010, urban area times; (2) A large number of woodlands occupied by city urban construction, nearly 20 years takes up the forest land area of 75.8 km², accounting for 51.56% of the nearly 20 years of new urban construction area;

Abstract: This paper takes land surface temperature as main indicator of urban thermal environment. Using the TM images of September 22, 2010, Harbin city, we analyze the spatial distribution characteristics of land surface temperature by mono-window algorithm. The results can be summarized as follows. The land surface temperature of estimation in Harbin City was between 9 to 27 °C. According to temperature gradient of different colors, urban land surface temperature was significantly higher than the suburbs in Harbin, and there were a few places, that was, high temperature and low temperature area showed obvious heat island effect. Strong heat island area were in the multiple center, distributed in DaoWai District, Nangang District and along the railway. From the faubourgs to the downtown area, the proportion of heat island increased gradually, the more strong the heat island effect was in the area located in the centre. From the point of the cause of heat island distribution in Harbin city, urban construction, population growth and real estate development were the main influence factors. The results of the study has important reference value for improving ecological environment of Harbin City, and mitigating urban heat island effect.

Abstract: Tailings pond is an important part of mine security operation, meanwhile its also a potential and serious hazard source. Determining the environmental impact region of tailings pond scientifically and veritably is of great significance to improve tailings ponds environmental monitoring and emergency management capability Using Chengui Town in Daye, Hubei as study area and WorldView-2 RS image as source data, the paper built the tailings ponds interpretation marks and extracted 76 tailings ponds information. With the watershed analysis method, the paper further used Daye DEM data to simulate water contour information, extract hierarchical river network and catchment watershed, then marked off the tailings ponds environmental impact area, which covered acreage was 59.96 square kilometers and accounted for about 37 percent of Chengui Towns land area. The paper concluded that the tailings ponds brought immense threat to the watersheds eco-environment and the residents safety. The study will provide a reference for relevant departments to strengthen environmental regulation and risk assessment of tailings ponds.

Abstract: The article mainly discusses the problems of Aglet technology to environment of the city information system. The collection system is designed on the basis of the platform of Aglet development. The structure of it is properly designed, and the function of it is perfect. We can use Aglet-Based City Environment Information Collection System easily. It can store and collect large amounts of environment information efficiently and accurately. It can also achieve the unification of the different data formats. It handles mainly the problems which are related to the collection of all kinds of complicated data.