Advanced Materials Research Vols. 955-959

Abstract: The correlation between Normalized Difference Vegetation Index (NDVI) and environmental factors is examined at different scales and locations in world heritage of Wuyi Mountain by wavelet coherency. These factors are elevation, slope, aspect, distance to nearest resident, distance to nearest road , and distance to nearest river along two transects based on data of DEM, residents, roads, rivers and ALOS remote sensing image in 2009.The results show that:(1) The relationships between NDVI and environmental factors change along with scale. The relationships between NDVI and environmental factors in the first transect are all weak at small scale (<480m). At medium scale (480-7680m), NDVI is significantly correlated with elevation, slope, resident , and road. At large scale (>7680m), NDVI is significantly correlated with elevation, resident and river. For the second transect, NDVI is significantly correlated with aspect at small scale; and significantly correlated with elevation, aspect, slope and river at medium scale; and significantly correlated with elevation, aspect, and slope at large scale. Thus elevation is the dominant controlling factors on the vegetation cover.(2)The relationships between NDVI and environmental factors also change when location changes. There is positive correlation between NDVI and elevation below the altitude of 600 m and the windward side of the southeast monsoon above 600m, while it is negative in the leeward side above 600m. Besides, NDVI is directly related with road, resident, slope, and river in the areas where the elevation is below 1200m, but inversely above 1200m.

Abstract: With the fast development of data acquisition and web transmission, the age of big geospatial data(BGD) has come. BGD will greatly change peoples’ life-style of and our society’s work mode. In agriculture field, there will also be a lot of changes brought by BGD in future. In this paper, we had a study on the processing of BGD and its application in agriculture. Firstly, we introduced BGD including its definition, value and application areas. Secondly, we summarized the research progress and key technologies of BGD processing in the cloud computing environment. Lastly, we talked about the application of BGD in agriculture industry and looked forward to its development trend.

Abstract: The development of mineral resources is accompanied by serious threats to the geological environment in China. In order to balance mining order, mine environmental protection and ecological restoration, this article examines a case study of Ningwu mining area and proposes an accurate method for mine dynamic monitoring in mining area based on remote sensing (RS), which is a series of technical processes with RS images selection, mine development situation and dynamic monitoring which includes areas change and types transfer. Findings indicate that the area of bauxite pit, bauxite and coal dump increased, the area of coal industrial square decreased, coal dump and industrial square mainly transferred into bauxite pit. The organization and storage model were discussed for results integrated management by spatial database engine (ArcSDE).The application of results retrieval was developed by GIS components. This method can be considered as an effective approach for a wide range of mine development monitoring in mining areas in China.

Abstract: In traditional geological field practice (GFP), there are many problems, such as waste of human and material resources, dispersion of geological phenomenon and failure to reproduce geological processes, which lead to the inefficiency of traditional education. Recently, virtual geographic environment (VGE) has become increasingly popular. It can provide us an immersive, interactive and collaborative three-dimensional (3D) multi-user virtual environment which can help us to solve the above problems. In this paper, we present a Virtual Geological Field Practice System (VGFPS) for Huyu Region based on OpenSimulator, an open source virtual world server which can be used to create VGEs. VGFPS integrates texts, images, videos and other multimedia with digital elevation models (DEMs), remote sensing (RS) images, buildings and landscapes, geological process simulation models and in-world scripts to enable teachers and students to explore, navigate, interact in virtual environment and communicate, collaborate with each other. Practices show it’s feasible to use VGEs to make GFP education more effective and it can be applied to the domain of virtual education.

Abstract: Panorama image can provide 360 degrees view in one hotspot, which could solve the traditional three-dimensional expression of inadequate authenticity, difficult data acquisition as well as laborious and time-consuming modeling. However, we need other geographic information. So we propose a kind of integrated model based on GML, which contains a set of data structures to obtain panorama, terrain and 3D Data rapidly from the GML file, after analyzing GML files structure and parsing by the Document Object Model (DOM). The experiment shows that integrated model is very validated in web application using PTViewer, Java 3D and Web-related technologies.

Abstract: The landscape pattern is often obviously changed at the disturbed area of the large hydropower projects. The landscape pattern of Xiangjiaba hydropower project was analyzed using the geographic information systems technology and the method of landscape pattern index to uncover the effect of hydropower project. Based on the data of GPS, aerial photography pictures and field investigation at Xiangjiaba hydropower’ disturbed area in 2012, the map of landscape pattern and land use was drawn using ArcGIS 10.0, and landscape pattern index was figured out using FRAGSTATS 4.0. The result showed that the total landscape was heterogeneous with 10 kinds of patch types at the disturbed area of Xiangjiaba hydropower project. These patches were ranked by area as: woodlands> farmland> township and village > river >engineering land > shrubs> abandoned land> artificial grassland> waters > open forests. The dominated landscape patch was woodlands with the largest area. The artificial grassland, farmland, engineering land, and woodland were fragmented seriously with high under the influence of human activity and natural condition.

Abstract: Annual mean NDVI of different Vegetation types during growing season are extracted from MODIS 8-day composite 500m reflectivity data in Inner Mongolia from 2000 to 2011 to analyze vegetation dynamic change and its spatial variation trends. It is shown that annual mean NDVI of different vegetation types has a slight upward trend during the past 12 years and the overall vegetation cover increases slightly. Area of improved vegetation is larger than degradated area and one third area basically no vegetation change, spatial pattern of vegetation cover change shows evident differences between regions.

Abstract: Rice cultivation is essential for agricultural production in Mekong Delta. Rice production estimation is based on the measurement of paddy field area and plantation system. Detection of paddy rice area and the plantation system is significant to food security decision. Based on the MODIS NDVI time-series data and the Dynamic Time Wrapping (DTW) similarity measure we detected the single and multiple rice distribution in Mekong Delta in 2010. Firstly, a combination of replacement and filter method was applied to denoising the MODIS NDVI time-series. Secondly, extracted the standard NDVI time-series cycle of single and multiple rice on MODIS NDVI time-series image. Thirdly, compare each pixel’s NDVI time-series cycle with each standard NDVI time-series cycle based on DTW distance. Finally, choose threshold in DTW distance and determine paddy rice’s distribution. Results were examined by sampling point and high resolution image of Mekong Delta; it shows that the extraction accuracy is 86%, relatively high for MODIS data classification outcome.

Abstract: A method calculating the precipitation at the site of every transmission tower based on the precipitation estimation data is proposed. An inverse-distance weighting (IDW) method is modified for spatial interpolation of the precipitation data received from Central Weather Bureau. Accuracy and computational speed are both put into consideration in the design of the proposed approach because vast amount of transmission towers is required to process at a time.

Abstract: This paper mainly discusses the sites of complex mountainous area wireless communication stations which is based on the analysis of the top digital model in order to highlight the advantages and functions of GIS in the practical application. This paper is thought on the theory of visual analysis, which is based on the digital model. According to the characteristic value of terrain data extraction, the obtaining and conversion of interpolation parameters as well as the features of characteristics and hope vector coverage area, the verification of signal coverage appears to be consistent with the shape visibility analysis of the base station position. With the assistance of professional ARCGIS, it can be easily to track the data and complete the 3D analysis and surface analysis of the typical complex mountainous terrain. Finally, the paper presents the prediction, preliminary selection, adjustment, optimization and results of station construction.