Current Field Vector Data Thinning And Expression

In the symbolic expression concerning vector data of the current field, because of the distribution of data points in the current field data products is so dense that it has made the visual confusion and the gland to each other symbols. Hence, such action would exert adverse impact on visual effects and information extraction and analysis.In this paper, by data normalization deal with the ocean current data separated from the thermohaline circulation data, pointed out that on the basis of conventional interval system pumping dilute lack of scientific deficiencies, proposed the use of space sampling spatial autocorrelation analysis ideas, by calculating the the local Moran’I worth to the local autocorrelation characteristics of the data points, respectively, to the currents flow direction and flow rate of the two clustering factor of five spatial aggregation mode: high aggregation (HH); whispered aggregation (LL); level of aggregation (HL); Low High aggregation (LH), and no significant aggregation of the data stratification. Combined according to the different aggregation mode currents environmental field characteristics of the development of the importance of the weight allocation table, the final calculation of the factor of two clustering under the influence of the weight of importance. Integrated weights of importance as indicators of the current field data points screened on the basis of this indicator, based on the buffer thinking the currents vector data point to filter pumping diluted.This paper presents three specific ocean current vector data point buffer screening algorithm, to the point buffer, line segments and vector arrows Minimum outsourcing sector buffer object space intersection test. Advantages of point buffer method is simple, the drawback is mistakenly deleted the unnecessary data deleted in some cases; methods can not effectively deal with the line segment intersects the head of the arrow to the problem of collisions; the vector arrow MIN outsourcing sector buffer The way to solve these problems and possible solutions to the arrow wear Island, in the three scenarios for the optimal solution.Algorithm and system development, by thinning with simple effect contrast confirmed that this method can be more scientific and reasonable visualization. Reach the final completion of the Marine Environmental Forecasting product visualization system, adding a new secondary means for marine forecasting.