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Estimation of soil properties in an un-sampled location is generally calculated with observation values of a number of neighbors around the un-sampled location to reduce the computational complexity. The more similarity there is between the neighbors, the better prediction at the un-sampled location. In this paper, we proposed a spatial homogeneity-based interpolation algorithm, which finds more similar...
The complexity of LUCC (Land Use / Cover Change, LUCC) determines that it is important to conduct the study of LUCC using complex system theories, in particular by the establishment of a mathematical model for complex systems. In this paper, the LUCC model was built based on GIS technology, CA (cellular automata) and Agent technology. Firstly, Landsat TM data of 2000 and 2010 are used to obtain the...
In order to solve the ill-conditioned problem in GPS rapid positioning, an improved algorithm for ADPAM was proposed. By computing the optimal mirror plane, this algorithm achieved a maximized angle between the projected epoch subspace and its adjacent epoch. Thus, the optimization of ADPAM is implemented. For illustration, a measured GPS example is utilized to validate this algorithm and the results...
With the development of the economy and rapid population growth, the range of contaminated groundwater is getting bigger and bigger. Groundwater pollution has a slow process, and it is not easy to find and difficult to control. Once polluted, it takes more than ten years, sometimes even decades to recover. Groundwater pollution has a close relationship with people's health. This paper mainly discusses...
Coastline extraction from remote sensing images has become an indispensable means in island coastal remote sensing survey, which plays a very important role in automatic navigation, targeting and mapping work. Image segmentation and boundary extraction are important ways to obtain the position of coastline. And active contour model has become an important tool for image segmentation and boundary extraction...
In this study, we propose to simulate the dynamics of surface flow using a Topological Flow-path Network model (TFN) based on scale-adaptive DEMs (S-DEMs). This model makes full use of the high accuracy DEM data to extract topographical and hydrological characteristics from the terrain surface. It also assigns these characteristics with scale properties, thus building a stream-network-bounded scale-adaptive...
In order to guide the city's waterlogging control, it's very necessary to research the urban waterlogging occurrence rules and how urbanization affects the urban waterlogging. In this paper, we select the catchment area located in Kunming Dongfeng East Road as study area to construct the urban waterlogging simulation model based on GIS and SWMM model. The procedure of model building contains sub-basin...
This paper focuses on the landing region of Chang E-3 (the satellite that will soon be sent to the Moon by Chinese government in 2013). The topographical and thermal factors are considered in our addressing model. Regions with a relatively lower slope and shadowed by hills several times a day are thought to be much easier for satellites to land and work on because these kinds of regions have a proper...
Soil salinization is one of the most prominent ecological problems of coastal plain in Northern China, which has degraded the ecosystem services of the region. This study, taking Huanghua County of Hebei Province in Northern China as a case study area, introduced the technology system and related technologies for subsurface drainage systems with an aim to optimize the ecosystem services of coastal...
This paper examines the causal relationship among economic growth, energy structure, R&D investment and carbon emission in China by using autoregressive distributed lag bounds testing approach of cointegration during the period of 1990–2011. In order to examine this linkage, theauthors use the two-step procedures. Firstly, theauthors conducted the unit root tests to measure whether the single...
This paper proposes a method for calculating exterior orientation parameters (EOPs) of images based on the condition that the straight line in the image space and corresponding line in the object space are coplanar. Experimental results have proved the feasibility and validity of this method, and the accuracy of EOPs is within one pixel and similar to that of point-based method. The position and direction...
Groundwater is one of the major sources of exploitation in mid-eastern China. Thus for protecting groundwater quality, data on spatial and temporal distribution is important. Geostatistics methods are one of the most advanced techniques for interpolation of groundwater quality. In this research, ordinary kriging was used for predicting spatial distribution of some groundwater characteristics including...
Because of influence of drastic human activities, flow routing methods of river that neglected seepage loss in flood forecasting exhibits a strongly inadaptability based on principle of mass conservation, continuity equations of water body considering seepage loss are derived in five conditions from simple one to difficult one, which joined with dynamic equation composed de Saint-Venant system of...
Based on the statistical data of 126 counties in Henan province, we described the spatial pattern and driving mechanism of per capita grain possession of Henan since the 1990s through the related analysis of spatial autocorrelation analysis, gravity center model and spatial econometric model. The results show that: first, there is certain spatial relevance on per capita grain possession in Henan....
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