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地理国情普查和监测是国情研究的重要组成部分,包括自然地理国情、人文地理国情、经济地理国情的普查和监测等内容。总结中国第一次中国地理国情普查和重点专题国情监测的成果,提出了地理国情普查和监测新需求,并重点探讨了地理国情的内容创新、技术创新和成果表达创新。建议在国情内容中增加地面沉降和形变、地表透水性、人文和社会经济信息;在技术创新方面,提出自然地理国情监测要充分利用基础测绘成果,通过行业共享和转换获得人文地理和社会经济地理国情,通过众源数据验证各类地理国情的现势性,基于对地观测传感网开展地理国情更新。在地理国情的成果表达方面,提出地理国情的分类需要上升到本体、矢量和栅格数据模型可用于一体化表达国情数据、地理国情普查的统计成果和监测模型要面向用户需求发布通用指数。对地理国情的服务提出展望。 相似文献
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吴琼 《测绘与空间地理信息》2015,(10):106-108
地理国情普查是地理国情监测的首要任务,其成果作为地理国情本底数据,可为我国经济建设和社会发展提供科学的空间依据。本文在简要介绍地理国情普查背景和成果内容的基础上,阐述了地理国情普查成果在宏观决策、减灾防灾、生态文明建设等领域的应用构想。 相似文献
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作为一种全新的基础地理信息产品形式,地理国情要素数据是第一次全国地理国情普查成果的重要组成部分。结合甘肃省地理国情普查的生产实践,系统归纳和总结了地理国情要素数据的质量元素、质量子元素及其检查项,对每个检查项的质量检查和控制方法进行了阐述,以提高地理国情普查数据的准确性和可靠性。 相似文献
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汤育红 《测绘与空间地理信息》2013,(12):89-91,95
地表覆盖分类和地理国情要素数据是地理国情普查成果数据的重要组成部分,同时也是统计分析的基本数据源。本文结合宁夏地理国情普查试点工作的技术和方法,详细阐述了普查试点生产过程中地表覆盖分类和地理国情要素信息的提取方法,并对生产技术方法进行了总结和探讨。 相似文献
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地理国情普查数据与资源环境调查数据有着密切联系。本文在实际案例的基础上,将地理国情普查数据与有关资源环境调查数据进行了对比分析。分析了地理国情普查数据的特点,指出地理国情普查数据和资源环境调查数据的差别主要体现在分类体系的差异、采集精度的差异、现势性3个方面。地理国情监测不能代替资源环境调查,但是可以对资源环境调查起辅助支持作用。 相似文献
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以湖北省为例,探讨湖北省地理国情监测工作指导思想、开展原则及目标,提出本省地理国情监测工作定位及服务对象,结合本省实际情况构想本省地理国情监测工作的主要任务,为其他省份开展地理国情监测工作提供参考。 相似文献
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《International Journal of Digital Earth》2013,6(1):80-87
Abstract Cultures throughout the world are associating with the rivers. People depend upon the rivers and their tributaries for food, water, transport, and many other aspects of their daily lives. Unfortunately, human beings have not calculated the accurate lengths for the great rivers even today. The lengths of the rivers are very different in popular textbooks, magazines, atlases and encyclopedias, etc. To accurately determine the lengths of the principal rivers of the world, the combination of satellite image analysis and field investigations to the source regions is proposed in this paper. The lengths of the Nile, Amazon, Yangtze, Mississippi, Yellow, Ob, Yenisey, Amur, Congo and Mekong, with lengths over or close to 5000 km, were calculated using the proposed method. The results may represent the most reliable and accurate lengths of the principal rivers of the world that are currently achievable. 相似文献
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软科学这一术语是70年代在国外提出的.然而30多年以来,它在国外不仅未得到普遍的承认,而且对软科学的定义也还未能达成大体上一致的共识.而在改革开放后的中国,出于决策科学化和民主化的需要,经过一些领导人的提倡和支持,特别是通过1986年召开的软科学座谈会及1994年召开的全国软科学工作会议,软科学事业得到了蓬勃的发展.据初步统计,截止1998年底全国共有软科学研究机构1224个,研究人员32655人,初步形成了一支较为强大的研究队伍,并取得了数百项覆盖多个领域的研究成果,为支持各级各类的决策发挥了一定的作用. 相似文献
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Tobias Nilsson Benedikt Soja Kyriakos Balidakis Maria Karbon Robert Heinkelmann Zhiguo Deng Harald Schuh 《Journal of Geodesy》2017,91(7):857-866
The very long baseline interferometry (VLBI) Intensive sessions are typically 1-h and single-baseline VLBI sessions, specifically designed to yield low-latency estimates of UT1-UTC. In this work, we investigate what accuracy is obtained from these sessions and how it can be improved. In particular, we study the modeling of the troposphere in the data analysis. The impact of including external information on the zenith wet delays (ZWD) and tropospheric gradients from GPS or numerical weather prediction models is studied. Additionally, we test estimating tropospheric gradients in the data analysis, which is normally not done. To evaluate the results, we compared the UT1-UTC values from the Intensives to those from simultaneous 24-h VLBI session. Furthermore, we calculated length of day (LOD) estimates using the UT1-UTC values from consecutive Intensives and compared these to the LOD estimated by GPS. We find that there is not much benefit in using external ZWD; however, including external information on the gradients improves the agreement with the reference data. If gradients are estimated in the data analysis, and appropriate constraints are applied, the WRMS difference w.r.t. UT1-UTC from 24-h sessions is reduced by 5% and the WRMS difference w.r.t. the LOD from GPS by up to 12%. The best agreement between Intensives and the reference time series is obtained when using both external gradients from GPS and additionally estimating gradients in the data analysis. 相似文献
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In this letter, we are trying to resolve the electromagnetic problem for the movements of the superconducting particles of the protoplanetary cloud in the magnetic field of Saturn. The force of levitation (Meissner-Ochsenfeld phenomenon) is introduced to the field of planetary science for the first time. It is shown from our theoretical analysis that rings of Saturn might have a superconducting origin, and rings might levitate within magnetic equator plane of the planet. 相似文献
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根据残差二次型次小与最小之差进行整周模糊度确认的关键是差值的分布,只有得到了合理的差值分布才可确定合理的界值.文中基于原有的两种方法及这两种方法的不足,从理论上导出了满足条件的差值分布,并作了一定的说明. 相似文献