针对矿区植被多、易造成失相干的问题,提出了一种将小基线集和干涉点目标分析(small baseline subsat and interferometric point target analyisis,SBAS-IPTA)方法与随机森林(random forest,RF)算法相结合的开采沉陷监测与预计方法。...针对矿区植被多、易造成失相干的问题,提出了一种将小基线集和干涉点目标分析(small baseline subsat and interferometric point target analyisis,SBAS-IPTA)方法与随机森林(random forest,RF)算法相结合的开采沉陷监测与预计方法。首先提取陕西省桑树坪矿区的沉陷速率及时序累积沉陷值,然后定量分析沉陷规律,最后将沉陷值作为RF的训练样本建立预计函数,并与灰色模型(gray model,GM)算法预计结果进行对比分析。结果表明:通过对该矿区在2007—2011年期间沉陷面积及沉陷值的分析,SBAS-IPTA方法可监测植被多的矿区的地表沉陷;结合GM算法预计的3个测试点的绝对误差和相对误差分别为35~423 mm和7%~88%,而结合RF算法预计的绝对误差和相对误差分别为1~29 mm和0~16%,RF算法预计结果明显优于GM算法预计结果,可将RF算法应用于开采沉陷预计。展开更多
利用2011年10月—2013年7月间获取的37景TerraSAR-X高分辨率条带模式SAR数据,采用干涉测量点目标分析(interferometric point target analysis,IPTA)技术得到常州地区因工厂集中开采地下水所引起的地表沉降信息,即常州市武进地区有多处...利用2011年10月—2013年7月间获取的37景TerraSAR-X高分辨率条带模式SAR数据,采用干涉测量点目标分析(interferometric point target analysis,IPTA)技术得到常州地区因工厂集中开采地下水所引起的地表沉降信息,即常州市武进地区有多处地表沉降,在2011—2013年间最大沉降速率为31.494 mm/a。通过与Envisat ASAR数据获取的平均沉降速率对比,说明TerraSAR-X数据不仅可以提高永久散射体(permanment scatter,PS)的点密度,而且能更好地描述散射体的细节变化和微量位移情况,体现出TerraSAR-X数据监测地表形变的优势。沈海高速公路常州沿线地面沉降的监测结果表明:TerraSAR-X数据在人工线状地物形变监测中具有广阔的应用前景;IPTA监测结果与水准测量结果具有较好的一致性,表明将IPTA技术应用于城市地表形变监测的正确性。展开更多
选取覆盖广州地区的29景ENVISAT/ASAR影像,基于干涉点目标技术(Interferometric Point Target Analysis,IPTA)提取了广州地区的地表形变结果,并对结果进行了分析与讨论。通过对4个沉降现象明显地区以及相应沉降严重地段的分析可知,广州...选取覆盖广州地区的29景ENVISAT/ASAR影像,基于干涉点目标技术(Interferometric Point Target Analysis,IPTA)提取了广州地区的地表形变结果,并对结果进行了分析与讨论。通过对4个沉降现象明显地区以及相应沉降严重地段的分析可知,广州地区地面沉降的发生由两种因素导致,一是该地区独特丰富的水文地质构造条件;二是设施建设、工业生产、经济发展等人类活动使该地土壤负载力增加,地下水需求与开采加剧,从而在多处地段呈现出不同程度的地面沉降现象。展开更多
Landslides are the most frequent geoenvironmental natural hazards in hilly regions,owing to broken rock masses and slope instability.Every year,landslides occur along the Karakorum highway in the northern section of t...Landslides are the most frequent geoenvironmental natural hazards in hilly regions,owing to broken rock masses and slope instability.Every year,landslides occur along the Karakorum highway in the northern section of the China-Pakistan Economic Corridor,involving complex geological action and causing significant damages and fatalities.To mitigate landslide hazard risks and a better understanding of landslide occurrence in steep mountainous regions,a comprehensive and precise analysis of slow-moving landslides is necessary.To address this challenge,a Multi-Temporal(MT),Interferometry Synthetic Aperture Radar(InSAR)approach using Small Baseline Subsets and Interferometric Point Target Analysis techniques was utilized to extract ground deformation rates.A total of 121 multitrack synthetic aperture radar images from Sentinel-1A were acquired from 2021 to 2023,enabling the detection and monitoring of ground displacement over time.Eight active slope movements were successfully identified by calculating the differences in deformation,indicating a significant deformation rate within the trust fault lines and regional geological formations.The research findings reveal that the regional geological structure,including lithology and fault lines,significantly increase the deformation rate.These identified landslide hazard areas range from 1.47 km2 to 14.88 km2,with an annual average rate of line of sight surface displacement estimated between−4.13 to−16.07 cm/yr.The MT-InSAR analysis demonstrates that fault lines and geology play significant role in surface deformation,providing valuable insights into the deformation induced by regional tectonic activities.展开更多
文摘选取覆盖广州地区的29景ENVISAT/ASAR影像,基于干涉点目标技术(Interferometric Point Target Analysis,IPTA)提取了广州地区的地表形变结果,并对结果进行了分析与讨论。通过对4个沉降现象明显地区以及相应沉降严重地段的分析可知,广州地区地面沉降的发生由两种因素导致,一是该地区独特丰富的水文地质构造条件;二是设施建设、工业生产、经济发展等人类活动使该地土壤负载力增加,地下水需求与开采加剧,从而在多处地段呈现出不同程度的地面沉降现象。
基金National Key R&D Program of China(2023YFE0208000)Construction Project of China Knowledge Center for Engineering Sciences and Technology(CKCEST-2023-1-5).
文摘Landslides are the most frequent geoenvironmental natural hazards in hilly regions,owing to broken rock masses and slope instability.Every year,landslides occur along the Karakorum highway in the northern section of the China-Pakistan Economic Corridor,involving complex geological action and causing significant damages and fatalities.To mitigate landslide hazard risks and a better understanding of landslide occurrence in steep mountainous regions,a comprehensive and precise analysis of slow-moving landslides is necessary.To address this challenge,a Multi-Temporal(MT),Interferometry Synthetic Aperture Radar(InSAR)approach using Small Baseline Subsets and Interferometric Point Target Analysis techniques was utilized to extract ground deformation rates.A total of 121 multitrack synthetic aperture radar images from Sentinel-1A were acquired from 2021 to 2023,enabling the detection and monitoring of ground displacement over time.Eight active slope movements were successfully identified by calculating the differences in deformation,indicating a significant deformation rate within the trust fault lines and regional geological formations.The research findings reveal that the regional geological structure,including lithology and fault lines,significantly increase the deformation rate.These identified landslide hazard areas range from 1.47 km2 to 14.88 km2,with an annual average rate of line of sight surface displacement estimated between−4.13 to−16.07 cm/yr.The MT-InSAR analysis demonstrates that fault lines and geology play significant role in surface deformation,providing valuable insights into the deformation induced by regional tectonic activities.
