Reserch On Water Quality Class Evaluation And 3D Fast Visualization Based On Perceived Information

Water resources is the most precious resource on earth,and it is the resources for human survival.With the development of human society,water resources were polluted sostenuto,so that harm to the health of human beings.Protecting water from pollution is the most important work in water resources protection.In order to effectively control water pollution,automatic monitoring system composed of wireless sensor network has been widely used in water environment monitoring.We get the water information perceived by the wireless sensor net work and evaluate the class of water quality with the perceptual information,and we use the three-dimensional visualization technology to draw water three-dimensional graphics based on the result of evaluating of water quality class.This have a good effect on water pollution prevention and control.At present,the use of wireless sensor network to detect information for water quality class evaluation is a research hotspot.Because of inevitable uncertainty and random uncertainty caused by the natural environment and the sensor's own factors,the normal methods of water quality class evaluation can not make a accurately performance.To solve this problem,a multi-sensor data fusion method for water quality evaluation based on interval evidence theory is proposed.Considering the precision error of sensor and the abnormalities of measured data,every water quality data measured by sensor is represented by interval number.By calculating the distance between the water quality data and the features of each water quality class,the interval evidence of water quality class is acquired.According to the interval evidence combining rule,a comprehensive interval evidence is obtained by combining the interval evidence of each sensor.Finally the water quality class is determined based on the comprehensive interval evidence by the decision rule.According to the result of water quality class evaluation,the water three-dimensional graphic can visualize the reality water environment intuitively,which drawed by using the three-dimensional visualization technology,and it is convenient for the reserchers to make decision.How to quickly render the current water environment according to esult of water quality class evaluation is the problem to be solved.In order to solve the problem,a three-dimensional fast visualization method for water environment is proposed.According to the results of water quality class evaluation,the corresponding water quality class graphics are selected from the case database.By constructing the BSP structure scene tree,using view frustum culling can promote the efficiency of render.And a three-dimensional fast visualization system for water environment is designed.