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南大洋海冰影像地图投影变换与瓦片切割应用研究

【标题】南大洋海冰影像地图投影变换与瓦片切割应用研究

【Title】APPLICATION OF SEA ICE MAP PROJECTION TRANSFORMATION AND TILE CUTTING OVER THE ANTARCTIC OCEAN

【作者】 田璐; 艾松涛; 鄂栋臣; 龚洪清; 沈权; 徐宁; 张宏洋

【Author】 Tian Lu ; Ai Songtao ; Gong Hongqing ; Shen Quan ; Xu Ning ; Zhang Hongyang ;

【期刊】极地研究

【Journal】

【期刊年份】2012

【卷】24

【期】

【关键词】 南极海冰; 地图投影; 瓦片切割; 图像重采样

【Keywords】 Antarctic sea ice; map projection; tile incision; image re-sampling

【摘要】 南大洋海冰分布是南极考察过程中影响破冰船航行的重要因素,也是南极研究的重要内容之一。目前国际上不同机构发布的南大洋海冰分布图,大多是球面投影,不能直接用于主流的瓦片地图发布。将极方位立体投影海冰图转换为目前主流的网络墨卡托投影地图,并利用合适的图像重采样方法,按照不同级别比例尺进行瓦片切割和编号存储,最终实现海冰影像地图的发布共享是本文的主要研究内容。笔者对不同的图像重采样方法进行了比较,分析了最邻近点采样方法、双线性内插和双三次卷积重采样方法的优劣,针对本文的研究优选双线性内插方法进行影像地图瓦片的切割,并最终叠加融合在Google地图上,实现了Google底图、准实时海冰影像图与破冰船走航位置的集成显示,为雪龙船的冰区航行提供了重要的数据支撑。

【Abstract】 The distribution of sea ice over Antarctic Ocean makes a great impact on the icebreakers' navigation, which is also an important content of Antarctic research. Maps of the sea ice over polar regions released by different international organizations are mostly stereographic projection, which can not directly overlap on Google tile-maps. To transform the polar stereographic projection map into Web Mercator projection map, which is the mainstream at present, to incise, number and storage the map tiles with appropriate resampling algorithms, according to the given scale, and to finally release and share the sea ice map tiles, are the main contents of this paper. The authors compared different resampling algorithms, analyzed the advantages and weak points of Nearest Neighbor Resampling, Bilinear Interpolation, and Bicubic interpolation. Over the polar area, Bilinear Interpolation algorithm is recommended to incise map tiles. Finally the sea ice tiles are overlaid on Google Maps in “XUELONG Online” information platform, integrated with the real-time and historical locations of icebreaker “XUELONG”. This contributes to the navigation of “XUELONG” across the floating sea ice area. This study is of great significance for the icebreaker’s route selection over sea ice area both in Antarctica and Arctic.

【基金/项目】 中国极地科学战略研究基金

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