浅谈北京市大比例尺地形图更新方法

大比例尺地形图作为城市基础地理信息系统主要的空间基础数据,在城市规划管理、交通、公众服务等众多领域都有着十分重要的作用。本文将结合目前大比例尺地形图的需求,总结现有地形图的更新技术方法,提出科学合理的快速更新方法。     

爱心在国土窗口闪耀——记湖北省武汉市江岸区政务服务中心国土窗口首席代表陈慧丽

最近3个月,陈慧丽成了公众眼里的新闻人物.这位湖北省武汉市国土资源和规划局江岸分局派驻江岸区政务中心国土窗口的首席代表,从未想过自己在平凡的岗位上能得到这么多荣誉——     

大阳山隧道控制网布设

隧道工程以所处地形地质结构复杂、劳动强度大及后期维护问题多而著称。高海拔地区隧道受地质气候条件影响,其测量及施工难度较大,对高速铁路隧道而言,更是如此。本文以大阳山隧道为例,结合GPS测量技术特点对该隧道控制网布设进行了设计,得出了相关结论。     

高轨空间碎片的观测模拟

对高轨空间碎片进行了观测模拟。在观测模拟中，分别选取南京和云南两个观测站；采用2种跟踪方式：跟踪恒星和跟踪卫星；对于同一地理经度上的同步卫星进行了观测；提供了发现新目标的方法；并给出了新目标的初轨。这为我国空间碎片的数据库的建立作了有益的尝试，对于卫星和航天器的飞行安全具有特别重要的意义。     

山东金青顶金矿床Ⅱ号矿体成矿特征

金青顶金矿床Ⅱ号矿体位于胶东隆起南缘,牟平乳山金成矿带中部,是目前该成矿带上最大的石英脉型金矿床。单个矿体延深之大,厚度、品位变化之稳定,且易采易选,这在胶东东部地区乃至全国尤为罕见。     

1.2米地平式望远镜竖轴摩擦传动的刚度

对该望远镜竖轴摩擦传动的刚度提出了一个检测方法,并对结果进行了分析。结论是;在我们需要的使用范围内,该摩擦传动装置无空程,不打滑,刚度是足够的。     

大连市现代农业园区建设用地调查

建设现代农业园区是近几年来我国农村出现的具有革命意义的创新。实践证明,它的建立、发展有利于农业结构的调整,有利于推进农业的集约化经营,有利于农业的国际化进程,有利于提高土地的产出率和农业的收入。农业是与土地紧密相连的,现代农业的进程不可避免地要涉及到农村用地的调整。但在这方面还存在着一些政策上不明     

衡阳市国土资源管理体制改革后运行情况的调查

衡阳市是湖南第二大城市,全市共辖耒阳、常宁2市,衡南、衡东、衡山、衡阳、祁东5县,南岳、石鼓、雁峰、珠晖、蒸湘5区,土地总面积1.53万km2。全市国土资源系统共有干部职工2840人,国土资源所195个,国土员1340人。2004年,党中央、国务院为保障经济平稳运行,解决国土资源管理特别     

Deepwater Ventilation and Stratification in the Neogene South China Sea

Combined data of physical property, benthic foraminifera, and stable isotopes from ODP Sites 1148, 1146, and 1143 are used to discuss deep water evolution in the South China Sea (SCS) since the Early Miocene. The results indicate that 3 lithostratigraphic units, respectively corresponding to 21-17 Ma, 15-10 Ma, and 10-5 Ma with positive red parameter (a*) marking the red brown sediment color represent 3 periods of deep water ventilation. The first 2 periods show a closer link to contemporary production of the Antarctic Bottom Water (AABW) and Northern Component Water (NCW), indicating a free connection of deep waters between the SCS and the open ocean before 10 Ma. After 10 Ma, red parameter dropped but stayed higher than the modern value (a*=0), the CaCO3 percentage difference between Site 1148 from a lower deepwater setting and Site 1146 from an upper deepwater setting enlarged significantly, and benthic species which prefer oxygen-rich bottom conditions dramatically decreased. Coupled with a major negative excursion of benthic δ13C at ~10 Ma, these parameters may denote a weakening in the control of the SCS deep water by the open ocean. Probably they mark the birth of a local deep water due to shallow waterways or rise of sill depths during the course of sea basin closing from south to east by the west-moving Philippine Arc after the end of SCS seafloor spreading at 16-15 Ma. However, it took another 5 Ma before the dissolved oxygen approached close to the modern level. Although the oxygen level continued to stabilize, several Pacific Bottom Water (PBW) and Pacific Deep Water (PDW) marker species rapidly increased since ~6 Ma, followed by a dramatic escalation in planktonic fragmentation which indicates high dissolution especially after ~5 Ma. The period of 5-3 Ma saw the strongest stratified deepwater in the then SCS, as indicated by up to 40% CaCO3 difference between Sites 1148 and 1146. Apart from a strengthening PDW as a result of global cooling and ice cap buildup on northern high latitudes, a deepening sea basin due to stronger subduction eastward may also have triggered the influx of more corrosive waters from the deep western Pacific. Since 3 Ma, the evolution of the SCS deep water entered a modern phase, as characterized by relative stable 10% CaCO3 difference between the two sites and increase in infaunal benthic species which prefer a low oxygenated environment. Thesubsequent reduction of PBW and PDW marker species at about 1.2 Ma and 0.9 Ma and another significant negative excursion of benthic δ13C to a Neogene minimum at ~0.9 Ma together convey a clear message that the PBW largely disappeared and the PDW considerably weakened in the Mid-Pleistocene SCS. Therefore, the true modern mode SCS deep water started to form only during the "Mid-Pleistocene climatic transition" probably due to the rise of sill depths under the Bashi Strait.