我国"多测合一"工作开展情况综述

介绍了"多测合一"政策的出台背景,汇总了国家和省级层面"多测合一"的政策文件和主要内容,总结了政策出台以来全国范围的主要学术活动,归纳了省级层面"多测合一"的技术标准及其特点,罗列了国内主要的多测合一商品化软件,展示了国内各地典型多测合一管理信息系统,报告了取得的主要学术成果.对已开展的"多测合一"工作进行了评价,提出了改进"多测合一"工作的6条建议.     

“南方数码杯”2020年“决胜全面小康,决战脱贫攻坚”暨“抗击新冠肺炎疫情”--优秀测绘工程论文评选揭晓

由北京测绘学会主办,《北京测绘》编辑部承办的“南方数码杯”2020年“决胜全面小康,决战脱贫攻坚”暨“抗击新冠肺炎疫情”优秀测绘工程论文评选日前揭晓。2020年12月26日在北京中裕世纪大酒店举办的北京测绘学会2020年学术年会上,北京测绘学会副理事长、国家基础地理信息中心副主任赵勇宣布获奖名单。本次获奖的9篇论文已全部分别在本年度《北京测绘》第6期“抗击新冠肺炎疫情优秀测绘工程”和第11期“决胜全面小康,决战脱贫攻坚”优秀测绘工程论文专栏登出。编辑部祝贺获奖者取得优异成绩,并希望获奖者再接再厉。     

城市地形图数据一体化建库与联动更新的数学原理

首先分析目前城市基础测绘部门地形图生产和建库的现状和存在问题,并比较城市地形图数据和GIS数据的异同,提出造成地形图数据和GIS数据不一致的主要原因是空间关系冲突;然后,具体分析二者属性信息不同点和图形信息不同的四个方面.求出GIS数据和地形图数据的全集及其分解,并对GIS数据集和地形图数据集进行基础分解,得到地形图和...     

Hypoxia in Manila Bay, Philippines during the northeast monsoon

Herein we present results from one of the first extensive bay-wide oceanographic surveys of Manila Bay, wherein 31 stations were sampled during the northeast monsoon (cold and dry season). A band of hypoxic bottom water (dissolved oxygen<2.8 mg/L) spanned the midsection of the bay from east to west. Bottom nitrate concentrations (5.7-16.8 μM; avg. 11.1 μM) and total organic carbon values in sediments (1.7-3.1%; avg. 2.4%) were high in the midsection, which coincided with the band of hypoxic bottom water. Physical processes and site-specific accumulation of organic material likely lead to hypoxic conditions in Manila Bay, even during the northeast monsoon period when the water column is relatively well mixed. The results of this study complement the previously reported widespread hypoxia that occurs during the rainy season. Thus, hypoxia may be pervasive in the bay throughout the year, although it varies in intensity and spatial extent.     

Nutrient inputs from submarine groundwater discharge on the Santiago reef flat, Bolinao, Northwestern Philippines

Submarine groundwater discharge (SGD) on the reef flat of Bolinao, Pangasinan (Philippines) was mapped using electrical resistivity, 222Rn, and nutrient concentration measurements. Nitrate levels as high as 126 μM, or 1-2 orders of magnitude higher than ambient concentrations, were measured in some areas of the reef flat. Nutrient fluxes were higher during the wet season (May-October) than the dry season (November-April). Dissolved inorganic nitrogen (DIN=NO3+NO2+NH4) and soluble reactive phosphorus (SRP) fluxes during the wet season were 4.4 and 0.2 mmoles m(-2) d(-1), respectively. With the increase population size and anthropogenic activities in Bolinao, an enhancement of SGD-derived nitrogen levels is likely. This could lead to eutrophic conditions in the otherwise oligotrophic waters surrounding the Santiago reef flat.     

Oracle Georaster的数据存储研究及其与ArcSDE性能的对比

GeoRaster是Orack Spatial在升级到10g之后新增的一个模块,它使Oracle Spatial具有了存储、索引、查询、分析和发布栅格数据的能力。因此GeoRaster使得Oracle具备了在不使用ArcSDE这种空间数据引擎的情况下也能存储和管理栅格数据的能力。本文将介绍栅格数据在Oralce GeoRaster中的存储方式,分析Oralce GeoRaster对栅格数据存储与管理的效率,并将其与ArcSDE的相关性能进行对比。最后,总结了Oracle GeoRaster的特点,以及在实际应用中应如何选择空间数据库引擎。     

首部《中国地理国情蓝皮书》发布

正2018年2月28日,中国测绘科学研究院发布了《中国地理国情蓝皮书(2017版)》。这是我国首次以蓝皮书形式将第一次全国地理国情普查成果进行出版。旨在为国家和地方提供一套客观、科学的地理国情数据和分析结果。     

CH/T 9025―2014《城市建设工程竣工测量成果更新地形图数据技术规程》标准解读

1制定的必要性和意义地形图数据更新是测绘地理信息工作的基本任务之一。《测绘法》和众多的地方测绘条例也规定地形图要定期更新。地形图数据更新工作量大、花费多。城市建设工程竣工测量是建设工程验收的重要工作之一,是判断建设工程是否满足规划设计的重要依据。一些城市开展了利用竣工测量成果进行