极地研究

极地研究 ›› 2016, Vol. 28 ›› Issue (2): 243-249.DOI: 10.13679/j.jdyj.2016.2.243

• 研究论文 • 上一篇    下一篇

基于改进NCC算法的东南极极记录冰川流速提取研究

牛牧野,周春霞,刘婷婷   

  1. 武汉大学中国南极测绘研究中心，湖北 武汉 430079；极地测绘科学国家测绘地理信息据重点实验室，湖北 武汉 430079
  • 收稿日期:2015-09-29 修回日期:2015-12-30 出版日期:2016-06-30 发布日期:2016-06-30
  • 通讯作者: 刘婷婷
  • 基金资助:
    国家自然科学基金;测绘地理信息公益性行业科研专项资助项目;国家海洋局海洋—大气化学与全球变化重点实验室开放基金课题

Derivation of ice-flow velocity of Polar Record Glacier using an improved NCC algorithm

Niu Muye，Zhou Chunxia，Liu Tingting   

  • Received:2015-09-29 Revised:2015-12-30 Online:2016-06-30 Published:2016-06-30

PDF (PC)

899

被引次数

1

摘要： 南极冰川的流速在南极物质平衡研究中有着重要的作用。本研究创新性地将SIFT算子的旋转参数引入传统的基于归一化互相关(NCC)的冰川流速提取方法, 使其拥有旋转不变的特性。利用此方法, 基于Landsat8 OLI数据对东南极的极记录冰川流速进行了提取, 并通过利用模拟影像和NASA发布的MEaSUREs冰川流速结果对该方法的精度进行了验证。结果表明, 改进的NCC算法能够在冰川流速方向改变区域提取更多的流速信息, 极记录冰川流速最大可达870 m a-1, 提取结果与MEaSUREs结果相比, 平均偏差为23.9 m a-1。

关键词: 极记录冰川, 冰川流速, NCC, 归一化互相关, 旋转不变性

Abstract: The ice-flow velocity of Antarctic glaciers play an important role in the mass balance study of Antarctic. In this study, a rotation parameter of SIFT algorithm was added into a traditional ice-flow velocity derivation method based on Normalized Cross-Correlation algorithm, making the method with rotation invariance. Based on this improved method, the ice-flow velocity of Polar Record Glacier in East Antarctica was derived using Landsat8 OLI data. Accuracy assessment was done using simulated data and MEaSUREs velocity data released by NASA. The results indicated that in the direction of velocity changed area, more ice-flow velocity can be derived. The maximum velocity of Polar Record could reach 870m/a. Compared with the MEaSUREs data, the average offset is 23.9m/a.

Key words: Polar Record Glacier, ice-flow velocity, Normalized Cross Correlation(NCC), rotation invariance