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搜索结果: 1-15 共查到知识库 地球形状学相关记录22条 . 查询时间(2.172 秒)
地球是已知唯一存在生命的星球,在地球形成最初的5亿年,地球环境可能经历了从炼狱到摇篮的剧烈转变。对于大气圈的演化而言,地球早期的大气由浓厚的CO2等温室气体组成,不利于生命的存在。而到了冥古宙末期,大气中CO2分压就已经极低。CO2是温室气体的主要成分,可以以深海碳酸盐矿物的形式进入地幔被封存在地球内部。但是冥古宙时期,究竟是何种过程导致了如此巨量的CO2被封存在地幔深部?早期地球又如何演化成为生...
This article proposes a construction method for a comprehensive geographic conditions evaluation index based on geographic conditions survey data combined with thematic data on society, economy, ecolo...
Copernicus is an European system created for Earth observation and monitoring. It consists of a set of Earth observation satellites and in-situ sensors that provide geo-information that are used, thro...
Digital Elevation Models (DEMs) have been increasingly used to model the terrain surfaces to provide the 'physical bases' for environmental studies. However, DEM is subject to systematic errors, rando...
Volcanic eruptions are one of the most serious of nature’s calamities, threatening both human lives and property in its immediate vicinity. The dangerous environment surrounding a volcano also causes ...
Soil erosion is one of the severe land degradation problems in many parts of the world. It not only affects on decreasing agricultural productivity but also it causes disasters such as siltation of re...
In this work, a theoretical-empirical model has been developed for the modelling of the local geometric accuracy of digital orthoimages from panchromatic QuickBird Very High Resolution Satellite Image...
Most data sets and streams have a geospatial component. Some people even claim that about 80% of all data is related to location. In the era of Big Data this number might even be underestimated, as ...
A new filtering method of airborne laser scanner data has been developed that is suitable for complex terrain, that is flat but with artificial depression such as openings of underground tunnels, ty...
Within the paper the integration of 3D building models in the context of location aware services is presented by two exemplary applications. First the intuitive access to object related information w...
This paper examines the importance of integrating different spatial and temporal knowledge representations in order to structure disaster relevant information. Special focus is made here on the human-...
In this work, the signification of some topo-climatic variables deduced from a DEM over vegetation regeneration processes after wildfires monitored on a semi-arid region from Landsat TM images has be...
我国的区域卫星导航系统COMPASS中,广播星历利用考虑一阶摄动影响的15个轨道根数参数描述卫星轨道,系统导航电文中给每个参数分配的比特位与GPS相同。然而,由于GPS星座由周期约12小时的MEO卫星构成,其轨道参数化方案和每个参数的比特位分配方案可能不适用于更高轨道的GEO和IGSO卫星。COMPASS的系统设计中考虑了由于GEO的小倾角、小偏心率特点产生的广播星历拟合精度损失问题,然而在系统组...
等高线作为地势起伏与地形凹凸特征的表达,与河流水系表达有着密切的约束关系。在空间数据库集成与匹配中,由于来源不同这两种数据往往出现不一致,导致河流“爬坡”现象。本研究针对该问题提出一种等高线河流匹配及一致性改正方法,利用Delaunay三角网模型在等高线基础上通过弯曲分析提取地形特征,基于河流分布与谷地走势的相关性,建立河流与等高线间的匹配关系,进而识别两者间的一致性与否。在此基础上利用仿射变换等...
青藏高原地壳的隆升与增厚,是一个复杂的热点问题。印度板块和欧亚板块的碰撞挤压导致地壳的隆升与增厚,已被地质、构造学等方面资料证实,但利用大地测量资料定量确定高原地下地壳增厚速率的很少。基于此,本文利用高精度绝对重力测量资料及GPS结果定量检测了高原拉萨点地壳增厚速率(3.9±0.8cm/a),并给出了简单的动力学模型,研究表明高原地下物质亏损,莫霍面增厚。

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