适应中国海岸空间形态的海籍影像数据块编码研究

我国海岸空间形态以台湾海峡为界,北部呈南北狭长型,南部呈东西狭长型,拟建海籍影像数据库需要适应这种特殊形态。为此,构建了二、四叉树混合分块模型,并针对该模型提出了改进的CMorton编码,利用长江口和杭州湾多分辨率卫星遥感数据构建了一个模拟环境对该编码进行测试。结果表明:与常用的行列号编码方式相比,改进的编码能够明显地缩短数据块的构建时间,能够满足海籍数据实时可视化的要求,有效地适应中国海籍影像对应的空间形态。

Research on marine cadaster image data blocking goding to adapt coastal spatial formation of China

Bounded by the Taiwan Strait, the north part of coastal zone in China is long and narrow in north-south direction, the south part is also long and narrow but in west-east direction. The imagery database of marine cadaster should adapt to this particular long and narrow spatial form. The paper carried out a composite block model of Binary Tree and Quadtree model, and according to this model, presented an improved Morton code—"CMorton code".We used multi-resolution remote sensing data of the Changjiang Estuary,Hangzhou Bay in north-south and coastal image in Fujian Province in west-east direction to test the coding method.The result showed that, compared with the usual row-column number coding, the CMorton code can significantly shorten the construction time cost of data block, it can satisfy the real-time visualization of marine cadaster data and efficiently adapt to the spatial form of Chinese marine cadaster imagery data.