Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR027666 |
Tracking Lake Surface Elevations with Proportional Hypsometric Relationships, Landsat Imagery, and Multiple DEMs | |
David Weekley; Xingong Li | |
2020-12-18 | |
发表期刊 | Water Resources Research
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出版年 | 2020 |
英文摘要 | Multi‐decadal inland surface water dynamics are of increasing interest due to their importance to climate, ecology, and society, yet several key challenges impede long‐term monitoring of inland surface waters globally. This research investigates two novel methods, one addressing sub‐hydroflattened surface estimate uncertainty issues, and a second addressing temporal resolution issues, using 46 water bodies across the western United States. First, low water level estimate uncertainty was reduced using multiple digital elevation models (ALOS, SRTM, and NED) to derive the hypsometric relationship for each lake from the digital elevation model with the lowest hydroflattened water surface. This technique reduced the number of images with sub‐hydroflattened water surfaces by at least 549 over the best individual DEM resulting in higher water surface elevation estimate accuracy. Second, this paper introduces proportional hypsometry which dynamically generates surface area/elevation relationships for every image using clear pixels only by removing contamination from both the image and DEM. Proportional hypsometry was found to be ill‐suited for sub‐hydroflattened water surface levels but produced comparable accuracy to clear images for above hydroflattened water levels. Overall, using the lowest hydroflattened surface along with proportional hypsometry improved temporal resolution enabling analysis of nearly 10,000 additional images while maintaining similar accuracy levels as images with <1% contamination (2.35 m RMSE vs 2.17 m RMSE). This research increases lower water elevation estimate accuracy and temporal resolution and is scalable enabling regional and global water dynamic analysis. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
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文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/308186 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | David Weekley,Xingong Li. Tracking Lake Surface Elevations with Proportional Hypsometric Relationships, Landsat Imagery, and Multiple DEMs[J]. Water Resources Research,2020. |
APA | David Weekley,&Xingong Li.(2020).Tracking Lake Surface Elevations with Proportional Hypsometric Relationships, Landsat Imagery, and Multiple DEMs.Water Resources Research. |
MLA | David Weekley,et al."Tracking Lake Surface Elevations with Proportional Hypsometric Relationships, Landsat Imagery, and Multiple DEMs".Water Resources Research (2020). |
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