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Chen T, Wang J, Che T, Hao X, Li H. High spatial resolution elevation change dataset derived from ICESat-2 crossover points on the Tibetan Plateau. Sci Data 2024; 11:394. [PMID: 38632296 PMCID: PMC11024087 DOI: 10.1038/s41597-024-03214-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 04/02/2024] [Indexed: 04/19/2024] Open
Abstract
Understanding elevation changes on the Tibetan Plateau is crucial to comprehend the changes in topography, landscape, climate, environmental conditions, and water resources. However, some of the current products that track elevation changes only cover specific surface types or limited areas, and others have low spatial resolution. We propose an algorithm to extract ICESat-2 crossover points dataset for the Tibetan Plateau, and form a dataset. The crossover points dataset has a density of 2.015 groups/km², and each group of crossover points indicates the amount of change in elevation before and after a period of time over an area of approximately 17 meters in diameter. Comparing ICESat-2 crossover points data with existing studies on glaciers and lakes, we demonstrated the reliability of the derived elevation changes. The ICESat-2 crossover points provide a refined data source for understanding high-spatial-resolution elevation changes on the Tibetan Plateau. This dataset can provide validation data for various studies that require high-precision or high-resolution elevation change data on the Tibetan Plateau.
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Affiliation(s)
- Tengfei Chen
- Key Laboratory of Cryospheric Science and Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China
- Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou, 730000, China
- National-Local Joint Engineering Research Center of Technologies and Applications for National Geo-graphic State Monitoring, Lanzhou, 730000, China
- Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou, 730000, China
| | - Jian Wang
- Key Laboratory of Cryospheric Science and Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China
- Heihe Remote Sensing Experimental Research Station, Key Laboratory of Remote Sensing of Gansu Province, Chinese Academy of Sciences, Lanzhou, 730000, China
| | - Tao Che
- Key Laboratory of Cryospheric Science and Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China
- Heihe Remote Sensing Experimental Research Station, Key Laboratory of Remote Sensing of Gansu Province, Chinese Academy of Sciences, Lanzhou, 730000, China
| | - Xiaohua Hao
- Key Laboratory of Cryospheric Science and Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China
- Heihe Remote Sensing Experimental Research Station, Key Laboratory of Remote Sensing of Gansu Province, Chinese Academy of Sciences, Lanzhou, 730000, China
| | - Hongyi Li
- Key Laboratory of Cryospheric Science and Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China.
- Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou, 730000, China.
- Heihe Remote Sensing Experimental Research Station, Key Laboratory of Remote Sensing of Gansu Province, Chinese Academy of Sciences, Lanzhou, 730000, China.
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Retrieval of DTM under Complex Forest Stand Based on Spaceborne LiDAR Fusion Photon Correction. REMOTE SENSING 2022. [DOI: 10.3390/rs14010218] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The new generation of satellite-borne laser radar Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) data has been successfully used for ground information acquisition. However, when dealing with complex terrain and dense vegetation cover, the accuracy of the extracted understory Digital Terrain Model (DTM) is limited. Therefore, this paper proposes a photon correction data processing method based on ICESat-2 to improve the DTM inversion accuracy in complex terrain and high forest coverage areas. The correction value is first extracted based on the ALOS PALSAR DEM reference data to correct the cross-track photon data of ICESat-2. The slope filter threshold is then selected from the reference data, and the extracted possible ground photons are slope filtered to obtain accurate ground photons. Finally, the impacts of cross-track photon and slope filtering on fine ground extraction from the ICESat-2 data are discussed. The results show that the proposed photon correction and slope filtering algorithms help to improve the extraction accuracy of forest DTM in complex terrain areas. Compared with the forest DTM extracted without the photon correction and slope filtering methods, the MAE (Mean Absolute Error) and RMSE (Root Mean Square Error) are reduced by 51.90~57.82% and 49.37~53.55%, respectively. To the best of our knowledge, this is the first study demonstrating that photon correction can improve the terrain inversion ability of ICESat-2, while providing a novel method for ground extraction based on ICESat-2 data. It provides a theoretical basis for the accurate inversion of canopy parameters for ICESat-2.
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