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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >High-Resolution Sea Ice Motion Estimation With Optical Flow Using Satellite Spectroradiometer Data
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High-Resolution Sea Ice Motion Estimation With Optical Flow Using Satellite Spectroradiometer Data

机译：利用卫星分光辐射计数据通过光流进行高分辨率海冰运动估计

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摘要

The purpose of this paper is twofold: 1) to propose an approach based on optical flow for the estimation of sea ice motion as an accurate, dense, and computationally efficient alternative to state-of-the-art pattern matching approaches and 2) to investigate the potential of moderate resolution imaging spectroradiometer (MODIS) optical satellite data for combined daily and high-resolution motion estimation. A series of MODIS image pairs for a selected region in Arctic Ocean is employed, and sparse pairwise correspondences between nonrigid patches are calculated. An edge-preserving sparse-to-dense interpolation is applied followed by variational energy minimization to compute the final optical flow. A state-of-the-art multiresolution pattern matching method based on phase correlation and normalized cross correlation is also implemented and evaluated for comparison. Thorough experimentation with different settings of input data preprocessing as well as varying scales of motion is performed. The derived motion vectors are compared with coarser resolution operational sea ice motion vector products from combined buoy and microwave satellite data. The proposed optical flow approach clearly outperforms the pattern matching method in most cases, both in terms of accuracy and motion vector consistency. The estimated motion vectors from the MODIS images highly correlate with the operational vector products. In addition, MODIS provides a vector field with spatial resolution two orders of magnitude higher than the operational products that are able to detect significantly smaller sea ice drifts.
机译：本文的目的是双重的：1）提出一种基于光流的方法来估计海冰运动，以作为最先进的模式匹配方法的准确，密集和计算有效的替代方法； 2）研究中分辨率成像光谱仪（MODIS）光学卫星数据在每日和高分辨率运动联合估算中的潜力。采用了一系列针对北冰洋选定区域的MODIS图像对，并计算了非刚性斑块之间的稀疏成对对应关系。应用保留边缘的稀疏到密集插值，然后最小化可变能量以计算最终光流。还实现并评估了一种基于相位相关和归一化互相关的最新多分辨率模式匹配方法，并对其进行了评估，以进行比较。使用输入数据预处理的不同设置以及不同的运动比例进行了充分的实验。将得出的运动矢量与来自组合浮标和微波卫星数据的较高分辨率的可操作海冰运动矢量乘积进行比较。无论在准确性还是在运动矢量一致性方面，所提出的光流方法在大多数情况下均明显优于模式匹配方法。从MODIS图像估计的运动矢量与运算矢量积高度相关。此外，MODIS提供的矢量场的空间分辨率比能检测到较小的海冰漂移的操作产品高两个数量级。

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