对基于卫星高度测量和基于DEM的方法进行比较研究,以估计湖水体积变化
Haotian Li1, Jun Chen2, Liguo Cao3
1Engineering Research Center of Building Energy Efficiency Control and Evaluation, Ministry of Education, Hefei, China; School of Environmental and Energy Engineering, Anhui Jianzhu University, Hefei, China.
概括
这项研究比较了卫星高度测量和数字海拔模型 (DEM) 方法来跟踪中国湖泊体积变化. 这两种方法都显示出很高的一致性,但每种方法在数据可用性和地形适用性方面都有局限性.
科学领域:
- 水文学的水文学
- 遥感 遥感 遥感 遥感
- 地理空间分析的研究.
背景情况:
- 精确监测湖水量变化对于水资源管理和了解气候影响至关重要.
- 评估湖泊体积变化的传统方法往往受空间或时间分辨率的限制.
- 基于卫星的遥感为大规模和长期水文监测提供了一个有希望的方法.
研究的目的:
- 为了比较基于卫星高度测量和基于数字海拔模型 (DEM) 的方法用于估计湖水体积变化的有效性.
- 评估这两种方法在中国不同湖区的一致性和局限性.
- 提供关于每种方法在水文研究中的适用性的见解.
主要方法:
- 基于卫星高度测量的方法:利用来自DAHITI (内陆水域水文时间序列数据库) 的水位数据和来自Landsat图像的湖面面积.
- 基于DEM的方法:使用SRTM DEM数据与Landsat衍生的湖面面相结合,以划定湖边界和估计体积.
- 研究地点:重点关注中国34个湖泊,涵盖2005年至2020年的各种地理和地形条件.
主要成果:
- 卫星高度测量和基于DEM的方法都在估计湖水体积变化 (R2 > 0.90) 中表现出高度的一致性.
- 卫星高度测量方法因DAHITI数据集中缺少水位数据而面临限制,这影响了时间覆盖.
- 基于DEM的方法显示出可变的性能,在西藏高原具有很好的适用性,但在新疆和中国东部平原等平坦地形地区的有效性降低.
结论:
- 卫星高度测量和基于DEM的方法可靠地监测湖水体积动态,显示出强烈的共识.
- 每种方法都有明显的局限性:高度测量时的时间数据差距和基于DEM的方法的地形依赖精度.
- 选择方法时应考虑区域特点,数据可用性和水文研究的具体要求.
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