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首页> 外文期刊>Remote Sensing of Environment: An Interdisciplinary Journal >Coarse scale in situ albedo observations over heterogeneous snow-free land surfaces and validation strategy: A case of MODIS albedo products preliminary validation over northern China
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Coarse scale in situ albedo observations over heterogeneous snow-free land surfaces and validation strategy: A case of MODIS albedo products preliminary validation over northern China

机译：非均质无雪地表上的粗尺度原位反照率观测和验证策略：以中国北部MODIS反照率产品初步验证为例

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摘要

To evaluate and improve the quality of coarse-pixel land surface albedo products, validation with ground measurements of albedo is crucial over the spatially and temporally heterogeneous land surface. The performance of albedo validation depends on the quality of ground-based albedo measurements at a corresponding coarse pixel scale, which can be conceptualized as the "truth" value of albedo at coarse-pixel scale. In this paper, a sampling strategy based on multiple nodes using wireless sensor network (WSN) technology, WSN-based albedo observation, is proposed. The WSN nodes are distributed in an optimal layout determined by a sequential selection method based on the representativeness of each sensor. The WSN dataset in this study includes 6 nodes. A method of weighting is used to upscale WSN node albedo to a coarse-pixel scale. The weights for each node are calculated with the ordinary least squares (OLS) linear regression method. Compared with the multiple scale validation strategy, the dataset of WSN albedo "truth" at the coarse-pixel scale reveals a good quality both in stability and continuity. Application of this strategy is exemplified by validation of the MODIS 1 km albedo product. (C) 2016 Elsevier Inc All rights reserved.
机译：为了评估和改善粗糙像素陆面反照率产品的质量，对陆面反照率进行地面测量的验证对于时空异质陆面至关重要。反照率验证的性能取决于相应粗像素尺度下基于地面的反照率测量的质量，可以将其概念化为粗像素尺度上反照率的“真实”值。本文提出了一种基于无线传感器网络（WSN）技术，基于WSN的反照率观测的基于多个节点的采样策略。基于每个传感器的代表性，通过顺序选择方法确定的最优布局将WSN节点分布。本研究中的WSN数据集包括6个节点。加权方法用于将WSN节点反照率提升到粗像素比例。使用普通最小二乘（OLS）线性回归方法计算每个节点的权重。与多尺度验证策略相比，WSN反照率“真”数据集在粗像素尺度上显示出了良好的稳定性和连续性。该策略的应用以MODIS 1 km反照率产品的验证为例。 （C）2016 Elsevier Inc保留所有权利。

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