The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Environmental impact assessment is usually a necessary procedure to evaluate the impacts of a project on its surrounding media before the construction started. However, assessment of the final environmental impact on human health is usually lacked during the evaluation process in China. This paper demonstrated a web based GIS system that consists of twofold, which can aid health assessment: 1) a database...
Large-scale man-made linear features has played more and more important role in modern life and the development of urban are seriously affected by the subsidence of them. Permanent Scatterers (PS) technology was developed as a powerful tool for subsidence monitoring. High resolution of 1m data can be provided by TerraSAR X-band (TSX) with a short revisit period of 11 days. More detail and sensitive...
The objective of this research is to explore the spatial correlation between impervious surface, green space and urban heat island based on a case study of Nanjing, China. The Landsat TM image was used to retrieve land surface temperature. According to the impervious surface area (ISA) and the fractional vegetation cover (Fr) having an inversely relation in urban built-up areas, the spatial pattern...
Wetland ecosystems have strong ability for carbon storage and fixation, and play important roles in the global carbon cycle. The accurate estimation of the leaf chlorophyll content is a significant foundation for researching wetland ecosystem cycle models. In this paper, the inversion of the leaf chlorophyll content was based on PROSPECT model from the physical mechanism angle. Leaf spectrum was simulated...
In order to make a quantitative analysis on spatial pattern of headquarters about top 500 enterprises of Chinese service industries, the software of ArcGIS 9.2 was adopted. The results showed that the headquarters were mainly distributed in the eastern coast region of China. The value of global Moran's I was about 0.11. High value regions were all distributed in the eastern coast region of China and...
A distributed hydrological model that can simulate the hydrological processes of watershed by considering both saturation-excess and infiltration-excess runoff mechanisms is intruduced. The model is based on MapWinGIS platform and adopts modular programming ideas, watershed features such as river network and subbasins can be extracted automatically. In the model, the hydrological processes of watershed...
Large gap of supply and demand for mineral resources brings an urgent need to develop technology and methods for mineral exploration. Metallogenic prediction plays a leading role in mineral exploration. In consideration of current software platform we used and characteristics of specific metallogenic prediction method, the efficiency and quality of metallogenic prediction are not so satisfactory....
Based on cellular automata, this article proposes a new method of simulating changes in Chinese Northeastern agricultural landscape. This case study in Dehui, China illustrates that natural and human factors are the main drivers of landscape transition. The model is controlled macroscopically by natural and policy factors. A set of principles are generated derived from a former remote sensing data...
In a GPS system, the process of acquisition costs most time of the whole, which is due to the large number of required operations in the correlators. Common methods usually use FFT or PFA(Prime Factor Algorithm)to calculate the correlation, choosing float as the data type of the operation, which will obviously increase computational complexity. In consideration of the specific storage mode of GPS...
The data collection and updating are all related to editing module in GIS, whether or not the editing module is good determine the system effect and the feeling of the user even the users' judgments. This passage mainly talks about how to describe the geo-entities via geometry model and how the geometry model and the geo-entities model cooperate with each other.
Road line type identification is very important in collecting and processing road information. This paper introduces an algorithm of rod line type identification based on cubic spline function, Random Hough Transform, the method of selecting weight iteration based on LS-TLS, and Condition Adjustment with parameters. The algorithm goes as follow. Firstly, we acquire road centerlines coordinates from...
In order to Investigation some changes which are created above time in poplar cultivated surface preparing updated map of poplar is one of the most important requirements in the management and region agricultural planning. In this research, surveying of poplar plantation investigated using IRS Satellite images in the region including province of Guilan, Iran. The method evaluated to images controlled...
More and more new data acquisition methods are beginning to emerge for providing abundant spatial data. LiDAR as a fast, high accuracy data acquisition way is increasingly adopted in many information systems. It is crucial to get the field data in the first place for emergency management. The up to date, real-time, good quality data can better serve for the emergency response decision making. Diverse...
Based on TM image data in 1997 and 2005, supported by RS and GIS techniques, seven indices were put forward to analyze the landscape pattern and stability of Jiuzhaigou Nature Reserve, these indices included diversity, dominance, evenness, fragmentation, isolation, fractal dimension and stability index. The results showed that: (1) the numbers and areas of landscape patterns were in the disproportion,...
The spatial pattern of land use/cover was quantitative analyzed by using DEM data. The results show that: (1) the spatial distribution rule of land use/cover with the change of elevation and slope has notable characteristic. The agricultural land, construction land, orchard, water and wetland in strongly human-disturbed land use types mainly distribute in lower altitude region and smaller gradient...
Selecting Sichuan Province as the study area, setting rainfall-induced shallow landslide hazard for the research objectives, choosing slope, fault zone, rivers, lithology, soil type and vegetation as the main evaluation factors of the environmental vulnerability assessment. Based on the landslides disaster database since 5.12 Earthquake in Sichuan Province, the weights of the evaluation factors are...
This paper focuses on the study of the academies from the Tang to the Qing dynasty in the Ganpo area based on Geographic Information System (GIS), including collecting the data, designing spatial and temporal logic of academies, building the corresponding spatial database, and analyzing based on the database. By using the standard deviation and mean center spatial analyses, it indicates that at the...
Geospatial Early Warning System of the Insect Pest is built to take full advantage of local and network data sources, which are constantly changing when used in the early warning system of pest. The system is a Web GIS that was developed as the B/S structure based on SOA. It implements a wide range of services through the integration or combination of components using Web Service technology, and its...
Typhoon is one of the worst natural disasters in the world. Sustainable development of the social and economic of our country is restricted by the effect of Typhoon. High-intensity rainfall brought by Typhoon is an important factor in the formation of disaster. There are two factors, the hazard of the Typhoon disaster control factors and the vulnerability of the regions Typhoon disaster happened,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.