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基于Landsat數(shù)據(jù)的條件植被溫度指數(shù)升尺度轉(zhuǎn)換方法
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“十二五”國(guó)家科技支撐計(jì)劃資助項(xiàng)目(2012BAD20B0103)和國(guó)家自然科學(xué)基金資助項(xiàng)目(41371390,、41071235)


Up-scaling Transformation Methods for Vegetation Temperature Condition Index Retrieved from Landsat Data
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    摘要:

    以陜西省關(guān)中平原為研究區(qū)域,,應(yīng)用點(diǎn)擴(kuò)散函數(shù)、混合像素面積權(quán)重法和中值像素變異權(quán)重法將基于Landsat衛(wèi)星遙感數(shù)據(jù)反演的分辨率為30m的條件植被溫度指數(shù)(VTCI)干旱監(jiān)測(cè)結(jié)果上推至930m的干旱監(jiān)測(cè)結(jié)果,,并與Aqua MODIS數(shù)據(jù)反演的分辨率為930m的VTCI干旱監(jiān)測(cè)結(jié)果進(jìn)行對(duì)比分析,,以期為兩種空間尺度的干旱監(jiān)測(cè)結(jié)果的綜合應(yīng)用提供技術(shù)支持,。以MODIS數(shù)據(jù)反演的VTCI為參考,應(yīng)用相關(guān)系數(shù),、均方根誤差,、半變異函數(shù)的估計(jì)值和圖像紋理特征等對(duì)尺度上推的VTCI進(jìn)行評(píng)價(jià)。結(jié)果表明,,點(diǎn)擴(kuò)散函數(shù)和混合像素面積權(quán)重法的尺度上推效果均較好,,而中值像素變異權(quán)重法的尺度上推效果較差,,說(shuō)明點(diǎn)擴(kuò)散函數(shù)和混合像素面積權(quán)重法均適用于研究區(qū)域VTCI干旱監(jiān)測(cè)結(jié)果的尺度轉(zhuǎn)換,且點(diǎn)擴(kuò)散函數(shù)的數(shù)據(jù)處理過程更為簡(jiǎn)單,。典型樣點(diǎn)VTCI的尺度上推結(jié)果表明,,空間異質(zhì)性越小,尺度上推的結(jié)果越好,。

    Abstract:

    Vegetation temperature condition index (VTCI) drought monitoring results retrieved from Landsat remotely sensed data (30m) in Guanzhong Plain, China were spatially transformed to a scale of the Aqua MODIS resolution (930m) by using point spread function, mixed pixel area weighting method and median pixel variability weighting method. The transformed VTCIs were compared with the ones retrieved from Aqua MODIS data for agreement analysis of the two drought monitoring results. Taking MODIS VTCIs as the ‘real’ droughts, correlation coefficients and root mean square errors between the upscaled Landsat VTCIs and MODIS VTCIs, and the texture and semivariances of the two VTCIs were applied to select the best transformation method. The results showed that the transformed VTCIs from the point spread function and the mixed pixel area weighting method were better than those from the median pixel variability weighting method, which indicates that the point spread function and the mixed pixel area weighting method were both suitable for transforming the retrieved VTCI drought monitoring results from Landsat remotely sensed data, and the data processing procedure of the point spread function was relatively simple. The transformed VTCIs in the selected sampling sites covered by winter wheat showed that the smaller the spatial heterogeneity, the higher the transformed accuracy.

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王鵬新,吳高峰,白雪嬌,劉峻明.基于Landsat數(shù)據(jù)的條件植被溫度指數(shù)升尺度轉(zhuǎn)換方法[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2015,46(7):264-271. Wang Pengxin, Wu Gaofeng, Bai Xuejiao, Liu Junming. Up-scaling Transformation Methods for Vegetation Temperature Condition Index Retrieved from Landsat Data[J]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(7):264-271.

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  • 收稿日期:2014-10-11
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  • 在線發(fā)布日期: 2015-07-10
  • 出版日期: 2015-07-10
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