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全国第二次土地调查于2007年下半年启动,2009年完成,安徽省于2008年4月率先启动了芜湖县的试点工作,并自行购买了ALOS1B1级数据制作DOM,套合上矢量的原始土地利用现状图,以便于外业调绘的全面开展.下面,是笔者对利用ALOS1B1级数据制作正射影像图以及外业调绘用图的方法进行了探讨,研究发现,此方法易于掌握,调绘底图的生产快速,质量可靠,效果显著. 相似文献
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以兰州交通大学天佑园为研究区域,在对三维GIS系统与其开发平台和开发环境进行比较分析的基础上,提出了基于Arc GIS Engine 9.2组件的三维场景建模技术,并对该技术的理论和建模方法进行了阐述。使用Arc GIS Engine 9.2组件技术开发出了一项可以显示虚拟场景浏览和漫游飞行的系统,在这个系统包含了一些常规的浏览方式,实现了虚拟场景的浏览。 相似文献
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Anne Hormes Maarten Blaauw Svein Olaf Dahl Atle Nesje Goran Possnert 《Quaternary Geochronology》2009,4(4):267-277
The problem of insufficient age-control limits the utilisation of the 8.2 ka BP event for modelling freshwater forcing in climate change studies. High-resolution radiocarbon dates, magnetic susceptibility and lithostratigraphic evidence from a lake sediment core from Nedre Hervavatnet located at Sygnefjell in western Norway provide a record of the early Holocene. We use the method of radiocarbon wiggle-match dating of the lake sediments using the non-linear relationship between the 14C calibration curve and the consecutive accumulation order of the sample series in order to build a high-resolution age-model. The timing and duration of Holocene environmental changes is estimated using 38 AMS radiocarbon dates on terrestrial macrofossils, insects and chironomids covering the time period from 9750 to 1180 cal BP. Chironomids, Salix and Betula leaves produce the most consistent results. Sedimentological and physical properties of the core suggest that three meltwater events with high sedimentation rates are superimposed on a long-term trend with glacier retreat between 9750 and 8000 cal BP. The lake sediment sequence of Nedre Hervavatnet demonstrates the following: only a reliable high-resolution geochronology based on carefully selected terrestrial macrofossils allows the reconstruction of a more refined and complex environmental change history before and during the 8.2 ka event. 相似文献
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