险情发生后，中国安能集团启动响应机制，从北京、四川成都、江西南昌、甘肃玉门、宁夏中卫等地调 集工程、水文、地质等技术专家和抢险骨干170余人，携带多功能侦测无人机、三维激光扫描仪、生命 探测仪等专业救援装备70台（套）紧急驰援。 经济观察网 据央视新闻客户端消息，8月7日以来，甘肃兰州市榆中县等地遭遇连续强降雨引发山洪灾 害，截至8日15时30分，已造成10人死亡、33人失联。 ...

Core Points - The article highlights the significance of the Chinese vertical datum point located in Qingdao, which serves as the national reference for elevation measurements, established in 1957 and maintained by dedicated personnel over the decades [1][4][10] Group 1: Importance of the Vertical Datum Point - The vertical datum point, established on Mount Guanshan in Qingdao, is crucial for unifying elevation measurements across China, allowing for consistent mapping and engineering projects [3][4] - The height of the vertical datum point is precisely measured at 72.260 meters, which is used as the baseline for all elevation calculations in the country [2][4] Group 2: Historical Context and Development - Prior to the establishment of the unified vertical datum point, multiple reference points existed, leading to inconsistencies in elevation data across regions, sometimes differing by 50 to 60 meters [3][4] - The selection of Qingdao as the location for the vertical datum point was based on its geographical advantages, including stable geological conditions and a long history of tidal observations dating back to 1898 [3][4] Group 3: Maintenance and Management - The management of the vertical datum point has been entrusted to the Qingdao Surveying and Mapping Research Institute since 1963, with dedicated personnel ensuring its upkeep and protection [4][5] - The current caretakers utilize modern technology, including geographic information systems and big data, to enhance the management and protection of the vertical datum point [7] Group 4: Contribution to National Development - The vertical datum point has facilitated the development of a comprehensive elevation network across China, supporting various sectors including infrastructure, transportation, and urban planning [8][9] - The surveying team is actively involved in providing comprehensive surveying services for urban projects, including the Qingdao urban rail transit system, ensuring safety and efficiency in construction [9]

Core Viewpoint - The article highlights the advancements in digital preservation and restoration of cultural heritage, specifically focusing on the efforts in Xiamen's Gulangyu Island, coinciding with China's 9th Cultural and Natural Heritage Day. Group 1: Digital Preservation Techniques - A team from Xiamen University is utilizing 3D laser scanning technology to collect detailed data on the historical building Huangrongyuantang, which is facing structural issues [3] - The 3D laser scanner captures data at a rate of 300,000 points per second, allowing for accurate recording of the building's surface coordinates, colors, and textures [5] - The combination of ground-based 3D laser scanning and drone aerial photography creates a high-precision 3D model, facilitating the management of the building's lifecycle [7] Group 2: Progress in Heritage Documentation - Gulangyu Island has completed digital archiving for 63 cultural heritage units at the district level and above, including 9 national and 2 provincial protected buildings [9] - The cultural heritage protection office plans to create a digital twin model of the 1.88 square kilometer island, integrating detailed architectural data with the heritage management system for better protection and management [11]