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| 1 | 全球气候变化背景下极地冰盖关键参数遥感观测验证显示文摘在当前全球气候变暖背景下,极地冰盖关键过程和重要参数研究对揭示极地冰盖对全球海平面变化的影响,提高海平面上升贡献的预测精度至关重要。极地科学考察的实地观测数据可以为遥感观测提供校准和验证,降低遥感反演的不确定性。本文基于同济大学全球变化研究团队近年来针对极地冰盖关键参数的测绘遥感与现场考察工作,重点阐述在极地科考观测验证和数据处理方面的研究,包括在南极冰盖的新型测高卫星的空-地协同验证、卫星角反射器布设、粒雪层内部温度观测与模型验证、多平台无人机海冰探测和雪冰环境调查,以及格陵兰冰盖质量变化评估等。最后,本文对未来的极地科考验证计划进行了展望。 | 乔刚 郝彤 李洪伟 陆平 安璐 陈秋杰 李荣兴 | 2022 | 测绘学报2022,51,4: | 2 |
| 2 | Monitoring of Coastal Subsidence Changes Based on GNSS Positioning and GNSS-IR显示文摘Coastal subsidence monitoring typically employs Global Navigation Satellite System(GNSS)positioning technology.This method provides information only about subsidence below the station base.Sediments in coastal areas tend to accumulate quickly,and subsidence can change significantly due to compaction and alluvium.Therefore,monitoring subsidence above the base is essential to obtain overall coastal subsidence.A new technology called GNSS-Interferometric Reflectometry(GNSS-IR)has been recently developed,which can utilize multipath effects to monitor reflector height.Since the base of the GNSS station is deep and the base length remains constant,the height changes measured by the GNSS-IR technology can reflect subsidence above the base.Accordingly,this paper employs GNSS-IR technology to measure subsidence changes above the base.Additionally,GNSS positioning technology is used to obtain subsidence changes below the base,and the overall subsidence change is then calculated using both GNSS-IR and GNSS positioning technology.The Mississippi River Delta,known for its significant sediment thickness,was selected as the study area,and data from FSHS,GRIS,and MSIN stations was analyzed.The results demonstrate that GNSS-IR can be used to measure the subsidence rate above the base,and the corrected overall subsidence rate is equivalent to the relative sea level rise rate. | Xiaolei WANG Zijin NIU Xiufeng HE Runchuan LI | 2023 | Journal of Geodesy and Geoinformation Science2023,6,2: | 0 |
| 3 | 沿海沉降变化GNSS定位及GNSS-IR组合监测显示文摘目前沿海沉降监测通常用全球导航卫星系统(GNSS)定位技术测量,然而其反映的是站点基底下方的沉积物沉降情况,对于站点基底以上的沉降信息则无法获知。而沿海地区由于冲积作用,沉积物快速堆积和压实,沉降变化较大。因此,需要对基底上方沉降进行监测,才能获得沿海整体沉降信息。随着GNSS的不断发展,GNSS-interferometric reflectometry(GNSS-IR)技术被证明可以利用多路径效应进行反射面高度监测。由于GNSS站点基底较深,且基座长度不变,通过GNSS-IR技术获得的地面高度变化,可以反映基底上方沉降情况。因此,本文利用GNSS-IR技术来测量基底上方沉降变化;同时,利用GNSS定位技术获得基底下方沉降变化,再综合利用GNSS-IR及GNSS定位技术获得整体沉降变化。本文选取沉积厚度较大的密西西比河三角洲作为试验地区,选取FSHS、GRIS和MSIN测站数据进行分析,相关算例结果表明:GNSS-IR可以用来测量基底上方沉降速率,改正后的整体沉降速率与相对海平面上升速率相当,可以更好地估计洪水易发性和陆地损失。 | 王笑蕾 牛紫瑾 何秀凤 李润川 | 2023 | 测绘学报2023,52,1: | 0 |
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