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Leaf area index (LAI) is an important descriptor of many biological and physical processes of vegetation. However, the challenges associated with differentiating tree and shrub LAI (tsLAI) have hindered research in mixed forests. Being the first spaceborne LiDAR system, geoscience laser altimeter system (GLAS) has demonstrated its advantage in collecting extensive forest structure information. In...
Drought is widely distributed in the world, resulting in the shortage of water resources, decreasing groundwater storage, reducing yields of crops, and sustained severe drought even cause serious social and economic problems that affect people's life. Based on the drought monitoring theory and remote sensing data, the drought assessment in Beijing-Tianjin-Hebei(JJJ) region from 2005 to 2014 have been...
Study on change of weather and climate extremes has become an important aspect in modern climate change research. Based on the data of daily temperature from year 1957 to 2009, the spatial and temporal features of trends of extreme climate events are studied by spline function interpolation, linear regression, generalized least squares and trend analysis, and the major conclusions are summarized as...
Land use/land cover change (LUCC) as an important part of global environmental change has always been one of the hottest issues of ecology research. Based on RS and GIS methods, land use information for 1990 and 2008 was acquired from TM images and analyzed in Yanqing County, Beijing, China. This paper analyzes spatial-temporal land use change in two basins covering the study period. The results showed...
The flood disaster has become one of the natural disasters, which brings serious damage to human now. In 2010 July, it is happened in more than a hundred years that the flood occurred in the northwestern of Pakistan. This paper uses this example to identify that the country's flood caused great casualties and economic loss. With the comprehensive consideration of precipitation, rivers, terrain, land...
This paper is based on the international and national study of the theory and the evaluation method of the life quality, and combining with the actual development characteristic of all the districts in Beijing to build a evaluation index system of the residents' life quality in Beijing — with 32 basic index (for 3 levels). Then four principal component factors of the life quality are extracted via...
Establishing database of marine stations real-time monitoring provides data support for marine environment forecasting sectors. According requirements of marine stations observation database, design and implement marine stations realtime monitoring database management system. Introduce the main method and technique of database construction. According respective characteristics of the marine monitoring...
The regional economic disparity is always a research hot spot to domestic and foreign scholars. In this paper, we take the Beijing-Tianjin-Hebei metropolitan region as research object and take the county administrative division as the basic research units. Considering the spatial characteristics, the exploratory spatial data analysis method of GIS is introduced, which includes global spatial autocorrelation...
Cohesion is one of key factors influencing the performance of collaborative learning. But it is hart to reckon and assess it in online collaborative learning environments. Social network analysis (SNA) is a new method and technique analyzing the properties of the interaction relations between participants. In this paper, we introduced the related key concepts in SNA, and presented an analysis model...
The aim of this paper is to study the regional economic difference with the spatial data mining theories. In this paper, we take the per capita agricultural total output value as index variable, and take the township as the basic analysis unit. Based on the ESDA methods (global and local spatial autocorrelation) of spatial data mining theory, including Moran I index, Moran Scatter Plot and LISA, we...
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