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首页> 外文期刊>Polar science >Application of time-lapse digital imagery for ground-truth verification of satellite indices in the boreal forests of Alaska
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Application of time-lapse digital imagery for ground-truth verification of satellite indices in the boreal forests of Alaska

机译：时移数字图像在阿拉斯加寒带森林卫星指标地面真实性验证中的应用

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摘要

Satellite remote sensing studies of snow cover in high-latitude boreal forests require ground-truth verification based on ground observation networks. In this study, we used time-lapse digital images to precisely detect the extent of snow cover at nine locations in the boreal forests of Alaska, and to demonstrate the relationship of these ground-truth measurements to satellite indices of snow cover. Our results show that normalized difference vegetation indices (NDVIs) and normalized difference water indices (NDWIs) show significant variations at the end and beginning periods of continuous snow cover: the NDVIs on the last days of continuous snow cover ranged from 0.12 to 0.37, and those on the first days of continuous snow cover ranged from 0.16 to 0.38. The normalized difference snow indices (NDSIs) were also positive during periods of continuous snow cover and negative during periods of no snow cover. The NDWIs varied significantly from the beginning to the end of periods of continuous snow cover. This study confirms that continuous snow cover is important for accurate phenological studies using NDVIs in the region of the trans-Alaska camera network. Simple cameras can be effectively utilized in ground-based networks, functioning not only as a ground-truth verification tools for calibrating satellite indices, but also as a source of data to fill data gaps in satellite records.
机译：卫星遥感研究高纬度北方森林的积雪需要基于地面观测网络的真实性验证。在这项研究中，我们使用时移数字图像精确地检测了阿拉斯加寒带森林中9个地点的积雪程度，并证明了这些地面真相测量值与积雪卫星指数的关系。我们的结果表明，标准化积雪植被指数（NDVIs）和归一化差异水指数（NDWIs）在连续积雪的末期和初期显示出显着变化：连续积雪末期的NDVI在0.12至0.37之间，并且连续积雪的第一天的范围从0.16到0.38。在连续积雪期间，归一化差异雪指数（NDSI）也为正，在没有积雪期间为负。 NDWI在连续积雪期间的开始到结束期间变化很大。这项研究证实，连续的积雪对于使用跨阿拉斯加照相机网络区域中的NDVI进行精确物候学研究非常重要。简单的摄像机可以有效地用于基于地面的网络，不仅可以用作校准卫星索引的地面真伪验证工具，而且可以作为填补卫星记录中数据空白的数据源。

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  • 来源
    《Polar science》 |2013年第2期|149-161|共13页
  • 作者

    Konosuke Sugiura; Shin Nagai; Taro Nakai; Rikie Suzuki;

  • 作者单位

    Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka 237-0061, Japan,University of Alaska Fairbanks (UAF), International Arctic Research Center (IARC), Fairbanks, AK 99775-7340, USA;

    Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama 236-0001, Japan;

    University of Alaska Fairbanks (UAF), International Arctic Research Center (IARC), Fairbanks, AK 99775-7340, USA;

    Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama 236-0001, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Time-lapse camera; Terra/MODIS; NDVI; NDSI; NDWI;

    机译：延时摄影机Terra / MODIS;NDVI;NDSI;现在;

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