| 基于综合分段优势的植被覆盖度模型比较 |
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| 引用本文： | 边慧芹,王雪梅.基于综合分段优势的植被覆盖度模型比较[J].草业科学,2021,38(3):432-442. |
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| 作者姓名： | 边慧芹 王雪梅 |
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| 作者单位： | 新疆师范大学地理科学与旅游学院,新疆 乌鲁木齐 830054;新疆师范大学地理科学与旅游学院,新疆 乌鲁木齐 830054;新疆干旱区湖泊环境与资源重点实验室, 新疆 乌鲁木齐 830054 |
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| 基金项目： | 新疆维吾尔自治区重点实验室招标课题“塔里木盆地北缘植被地上生物量遥感估测研究”(XJNUSYS2019A14);国家自然科学基金“塔里木盆地北缘绿洲–荒漠过渡带植被对土壤盐渍化的响应研究”(41561051);自治区研究生科研创新项目“基于改进植被指数的渭–库绿洲植被覆盖度反演及时空演变分析”(XJ2019G228)。 |
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| 摘 要： | 基于Landsat 8 OLI遥感影像选取9种植被指数,与野外实测植被覆盖度进行相关性分析,采用分段方式选择敏感植被指数,构建回归模型及FCD模型(forest canopy density mapping model,FCD)对渭干河–库车河三角洲绿洲植被覆盖度进行反演。结果表明:1)根据实测数据计算不同植被指数在不同植被覆盖度范围内的变化比例,从而确定0.3和0.7作为研究区植被覆盖度的分段点;2)分段回归模型与综合分段优势的FCD模型建模精度均约为79%,但综合分段优势的FCD模型建模集R2较高,RMSE较小,其验证结果优于分段回归模型,验证集R2为0.832,RMSE为0.154,精度为82.018%。综合分段优势的FCD模型更适合用于研究区总体植被覆盖度反演,可为干旱区植被覆盖度定量监测与生态环境评价提供依据。
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| 关 键 词： | 植被指数 分段回归 FCD模型 植被覆盖度反演 渭干河—库车河三角洲绿洲 |
Comparison of vegetation coverage models based on comprehensive segmentation advantages |
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| BIAN Huiqin,WANG Xuemei.Comparison of vegetation coverage models based on comprehensive segmentation advantages[J].Pratacultural Science,2021,38(3):432-442. |
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| Authors: | BIAN Huiqin WANG Xuemei |
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| Institution: | (College of Geography Science and Tourism,Xinjiang Normal University,Urumqi 830054,Xinjiang,China;Xinjiang Laboratory of Lake Environment and Resources in Arid Zone,Urumqi 830054,Xinjiang,China) |
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| Abstract: | On the basis of Landsat 8 OLI remote sensing images,nine vegetation indices were selected to analyze the correlation between vegetation indices and field-measured vegetation coverage.A sensitive vegetation index was selected based on the segmentation method,and regression and FCD(forest canopy density mapping model)models were used to invert the vegetation coverage in the Weigan-Kuqa River delta oasis.The following results were obtained.1)Using the measurement data,the change proportion of different vegetation indices in different vegetation coverage ranges was calculated,and 0.3 and 0.7 were determined as the segmentation points of vegetation coverage in the study area.2)The modeling accuracy of the segmented regression and FCD segmentation models was approximately 79%;however,the R2(0.832)and RMSE(0.154)values of the FCD segmentation model were higher and smaller,respectively,than those of the segmented regression model.Thus,the FCD segmentation model was established as providing better validation results(PRECISION of 82.018%).The FCD segmentation model is therefore considered more suitable for inversion of the total vegetation coverage in the study area,and will contribute to the quantitative monitoring of vegetation coverage and evaluation of the ecological environment in arid areas. |
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| Keywords: | vegetation index segmentation regression forest canopy density mapping model vegetation coverage inversion the delta oasis of Weigan-Kuqa River |
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