From a fresh field investigation, it has been ascertained that the Late Palaeozoic Yu'erhong (Yuernhung) flora from Yu'erhong, Yumen, Gansu, northwestern China, studied by Bohlin in 1971 includes plants from t...From a fresh field investigation, it has been ascertained that the Late Palaeozoic Yu'erhong (Yuernhung) flora from Yu'erhong, Yumen, Gansu, northwestern China, studied by Bohlin in 1971 includes plants from the Westphalian Yangfukou Formation and the Stephanian to Sakmarian Taiyuan Formation. The Yu'erhong flora from the Yanghukou Formation is dominated by Euramerican elements with a few elements of the Cathaysian flora. No Angarian elements have be found in this section for lack of Late Permian strata. The specimens studied by Bohlin might possibly come from the upper part of the Upper Permian at tne southeastern corner . of the Yu'erhong basin. Those fossils from different horizons and localities might be mixed with each other during collection ;so they fail to reflect the exact horizon of certain plant fossils.展开更多
Synthetic Aperture Radar(SAR)remote sensing is increasingly favoured in archaeological applications.However,the effectiveness of this technology for archaeological prospection has so far not been fully assessed.In thi...Synthetic Aperture Radar(SAR)remote sensing is increasingly favoured in archaeological applications.However,the effectiveness of this technology for archaeological prospection has so far not been fully assessed.In this study,an integrated single-date and multi-temporal SAR data-processing chain was proposed to sharpen archaeological signs and hence their detection and monitoring.In total,14 scenes of X-band Cosmo-SkyMed,C-band Sentinel-1 and L-band PALSAR data covering the Western Regions of the Silk Road Corridor in China were employed for two important archaeological sites including the Yumen Frontier Pass with emerging archaeological traces and Niya ruins with subsurface remains.The results pointed out that single-date satellite radar data were useful for the identification of subsurface traces buried under desert in the landscape-scale,whereas for the identification of emerging monuments,Sentinel-1 was limited by its lower spatial resolution compared to TerraSAR and PALSAR data.Multi-date products,such as interferometric coherence,the averaged radar signatures and RGB multi-temporal composites,were effective to sharpen archaeological traces as well as for change detection in Yumen Frontier Pass.This study presents a pilot assessment of satellite SAR data for the analysis and monitoring of archaeological features in the predominantly arid-sandy environmental characteristic of investigated sites.展开更多
基金This paper presents a part of the reseatch results of Project 49172068 supported by the National Natural Science Foundation of China
文摘From a fresh field investigation, it has been ascertained that the Late Palaeozoic Yu'erhong (Yuernhung) flora from Yu'erhong, Yumen, Gansu, northwestern China, studied by Bohlin in 1971 includes plants from the Westphalian Yangfukou Formation and the Stephanian to Sakmarian Taiyuan Formation. The Yu'erhong flora from the Yanghukou Formation is dominated by Euramerican elements with a few elements of the Cathaysian flora. No Angarian elements have be found in this section for lack of Late Permian strata. The specimens studied by Bohlin might possibly come from the upper part of the Upper Permian at tne southeastern corner . of the Yu'erhong basin. Those fossils from different horizons and localities might be mixed with each other during collection ;so they fail to reflect the exact horizon of certain plant fossils.
基金Hundred Talents Program of the Chinese Academy of Sciences(CAS)[Y5YR0300QM]Youth Director Fund Category-A of Institute of Remote Sensing and Digital Earth,CAS,and the Italian Ministry of Foreign Affairs in the framework of the Great Relevance Project‘Smart management of cultural heritage sites in Italy and China:Earth Observation and pilot projects’.PALSAR data in Xinjiang Uygur Autonomous Region,China were provided by the European Space Agency(ESA)through the Category-1 Project Id.28640+1 种基金Terra-SAR-X data were provided by Deutschen Zentrums für Luft-und Raumfahrt(DLR)through the TanDEM-X Science proposal CAL_VAL6905The archaeological layer of Niya ruin was from Archaeological Institute of Xinjiang Uygur Autonomous Region,China.
文摘Synthetic Aperture Radar(SAR)remote sensing is increasingly favoured in archaeological applications.However,the effectiveness of this technology for archaeological prospection has so far not been fully assessed.In this study,an integrated single-date and multi-temporal SAR data-processing chain was proposed to sharpen archaeological signs and hence their detection and monitoring.In total,14 scenes of X-band Cosmo-SkyMed,C-band Sentinel-1 and L-band PALSAR data covering the Western Regions of the Silk Road Corridor in China were employed for two important archaeological sites including the Yumen Frontier Pass with emerging archaeological traces and Niya ruins with subsurface remains.The results pointed out that single-date satellite radar data were useful for the identification of subsurface traces buried under desert in the landscape-scale,whereas for the identification of emerging monuments,Sentinel-1 was limited by its lower spatial resolution compared to TerraSAR and PALSAR data.Multi-date products,such as interferometric coherence,the averaged radar signatures and RGB multi-temporal composites,were effective to sharpen archaeological traces as well as for change detection in Yumen Frontier Pass.This study presents a pilot assessment of satellite SAR data for the analysis and monitoring of archaeological features in the predominantly arid-sandy environmental characteristic of investigated sites.
