一种海陆交错带气象等值线间隔自动设置方法

An approach of automatic interval setting for sea-land ecotone meteorological contours

常规的海洋气象要素绘制方法会造成等值线在海洋和陆地上分布不均匀,降低海洋区域可获取的信息量.据此,提出一种海陆交错带气象等值线间隔自动设置方法.首先将原始要素与海陆分界数据进行叠加分析,提取出海洋区域,然后进行斑点去噪计算,得到海洋区域数值范围,再结合映射表选择合适的间隔值,最后合并海洋和陆地区域,获得不等间距间隔.实验结果表明,该方法可以实现海洋气象等值线不等间距间隔的自动设置,有效突出海洋区域要素的变化,适用于海洋气象专题图制作等领域.

Conventional contouring method of marine meteorological elements makes the contour distribution uneven in the sea-land ecotone, which reduces available information from the marine area. To address this problem, a methodology is developed to set meteorological contour interval of the sea-land ecotone automatically. First of all, extract the marine area from raw data by utilizing GIS overlay analysis, and get proper numerical range after denoising the data obtained. Then we use the mapping table to choose the appropriate interval value. At last, combine the marine with land interval to get a new complete interval. Experimental results demonstrate that this method can set nonuni- form marine meteorological contour interval automatically, and highlight the changes of marine area elements. It can be applied to marine meteorological thematic map making, etc.