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Compared with the common line-simple algorithm, contour generalization pays more attention on the spatial relationship and coordination between the lines. Using the common D-P algorithm may cause intersection or self-intersection. Combined with the particularity of contours, this paper improves the Douglas-Peucker simplification algorithm from tolerance, curvature and the simplified method. The experiment...
Uncertainties from aerosol type greatly affects the accuracy in water color remote sensing for case II waters. An algorithm, depicted as ACCIA, dedicated to define the aerosol types over case II waters is developed by iterating the four critical component concentrations in an aerosol type: dust like, water soluble, oceanic and soot. A software function module is also developed in Visual Studio 2010...
Most of cities in the world like Shanghai have a large number of underground facilities including public transport and commercial facilities such as shopping malls, subway, parks, etc. The safety of underground spaces has become a very important aspect of urban safety. Underground facilities are very much vulnerable to waterlogging disasters. Urban waterlogging disasters have been causing havoc to...
The software GPS receiver puts forward higher request for sensitivity and real-time processing. Due to a great quantity of complex calculations in the baseband operations, it consumes too much time to achieve real-time goal. In this paper, we propose an optimized method utilizing the DSP module as a support tool, converting most of the float calculations into integer calculations and reducing part...
Sobol algorithm is one of the most representative global sensitivity analysis methods. Parameters sensitivity analysis is a necessary step for crop model localization and regionalization. We used Sobol algorithm to analyze the parameters sensitivity of ALMANAC model, including crop parameters, soil parameters, meteorological parameters and field operating parameters. The result of the study showed...
Terrain visibility analysis is widely used in many areas, but the existing methods still have some unsolved problems, such as complexity in computation and bad applicability. In this paper, a depth mapping based method is given to solve the problem. First, the terrain was rendered with perspective projection from the observation point, and the depth of the terrain surface was saved into a depth map...
Crop planting area is significant to agricultural structure adjustment and regional food balance policy. Based on field investigation and spectral property analysis of corn in HJ1-CCD images, different threshold configurations are set to build decision trees and corn planting area is precisely extracted utilizing multi-temporal HJ-1 CCD images in Zhecheng county, Henan Province of China. Both statistical...
The core problem for spatial data infrastructure developers lies in the fact that the real needs of users become clear in the process of exploitation. This paper describes our experience in designing a flexible data production system with a potential to handle unpredictable demands in the future. Most users want a fine-tuned data system output — a requirement which in many cases is somewhat hard to...
Lacking of ability for managing and analyzing Ecology data, the currently available reservoir information system can not satisfy the demand of ecological operation. Based on the analysis of ecological environment and its influencing factors, this paper organizes and classifies the reservoir information, and builds the relationship between multiple data with contrastive analysis methods. A reservoir...
Admitting the stochastic nature of taxi movement at the individual level, this paper explored the spatiotemporal structure of taxi services in Shanghai from a macro perspective. A GPS-based taxi service dataset was first processed to derive a total of 9921 taxies' OD, which were then tallied by individual street districts. An index known as Traffic Ratio Density was computed to characterize the level...
In this paper, the content and distribution of soil organic matter (SOM) along a soil profile was predicted using two hyperspectral imaging cameras, a visible and near infrared (VNIR) camera (400–1000 nm) and a near infrared (NIR) camera (900–1700 nm). Three to five soil samples were taken from the different horizons of each soil profile. Each sample was divided into four subsamples of different soil...
Guam, USA has been facing drastic landscape change since World War II, especially when President John F. Kennedy lifted the Naval Clearing Act which opened Guam's ports to domestic and foreign visitors in 1962. Extensive construction activities in 1970s and 1980s changed the land cover in Guam, particularly the central and northern parts of Guam a lot. This research is focused on determination of...
Dense Dark Vegetation algorithm (DDV) is effectively used in retrieval of aerosol optical depth (AOD) from satellite images over land. However, the algorithm is only suitable for low albedo areas such as water and dense vegetation areas. The purpose of this paper is mainly to retrieve aerosol optical depth over none DDV pixels by using the kriging interpolation method, we first retrieve the aerosol...
Soil moisture is an important factor for agricultural production and drought monitoring, and soil moisture retrieval for Tibetan plateau has an important practical significance for global climate change and flood monitoring. In this paper, the radiative transfer progress is built to measure the exchange from the soil surface to vegetation. In order to retrieval the soil moisture, the vegetation optical...
Temperature-Vegetation Dryness Index (TVDI) is the most important index in describing the soil moisture. Available TVDI calculation depends on the remote sensing data and computational algorithms. With a partial updating of the algorithms and remote sensing data, it needs to recompile and redeploy the implementation of the TVDI calculation, which contains duplicated work and can't take full use of...
In March 2009, influenza A(H1N1) was first detected in Mexico, and quickly spread to other countries. Civil aviation traffic played a very important role during the global spread of the epidemic. We build a spatial-temporal model to simulate the spreading process of influenza A(H1N1) at two spatial scales: simulating case evolution within province and inter-provincial spread in mainland China. Using...
In order to provide services of geological information to the public, China Geological Survey constructs China Geology Survey Information Grid (CGSIG). The security and confidence of these geological data are high level, especially of the final data, final maps and final geological maps which relate to the state secret. This paper analyzes the structure of geological map database, the discovering...
This paper presents a method that apply shape context features to identify building from high remote sensing image automatically. This method use adaptive algorithm of key point detection to detect the key point of building boundary rapidly. By eliminating the unstable points, the stability of detected edge points can be improved. We apply the selected points for log-polar coordinate's transformation...
The Liaodong Bay is the northernmost part of China's seas, and sea ices are often seen there in cold winter, which strongly affect the development of marine economy, maritime transportation, and offshore fishery. The temporal and spatial changing patterns of sea ices in the Liaodong Bay were primarily examined with Landsat remote sensing images totaling 20 scenes. The results show that sea ices in...
Clouds are integral part in 3D-GIS visualization, without them 3D scene seem unrealistic. The paper presents a technical framework to simulate clouds from macroscopic to microcosmic scale in Global 3D-GIS. In the case of the macroscopic scale, which means the viewpoint is far away from the 3D scene in 3D-GIS, cloud was expressed with semi-transparent planar texture. In other case, we consider the...
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