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《测绘与空间地理信息》2020,(6)
地理国情普查标准时点核准是2015年第一次国情普查中的一项重要工作,核准工作是在普查数据的基础上进行的。本文阐述了在第一次国情核准工作中主要核准对象采集的注意事项、工作原理,可为国家重大决策和政策的制定提供依据,并为相关部门专业监测提供公共基础数据。 相似文献
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地理国情普查标准时点核准是对普查成果进行补充和完善,在发现普查及核准阶段成果变化的同时,找出由于当时所用资料的时效性和外业核查时的局限性而导致的遗漏或错误,从而进行填充和变更工作。本文通过标准时点普查与核准期间发现的变化,对影像精度检测、核准数据生产,以及元数据变更等情况进行了分析,提出了几点建议,供今后工作借鉴。 相似文献
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通过核实从数据采集到标准时点阶段发生变化的内容,补充新增内容,消除普查前阶段由于资料时效性和外业局限性等导致的现势性不统一现象,对变化的地理国情信息进行核准,使地理国情普查数据成果在时间上达到统一,是开展地理国情监测的基础。 相似文献
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变化区域的识别是地理国情普查标准时点核准工作的关键内容,实际生产中主要采用人工检查的方式提取变化区域。本文主要探讨遥感影像自动解译在标准时点核准工作中自动提取变化区域的可行性。结果表明,通过自动解译不仅能正确提取部分地物的变化,而且能自动提取变化区域的精确影像和时相等相关信息。 相似文献
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地理国情普查是国务院部署的重大项目,其中,第一次全国地理国情普查标准时点核准工作于2015年正式启动。面对多源的卫星遥感数据,对于影响因素复杂区域很难实现影像的自动纠正,因而,本文主要介绍了利用PixelGrid软件进行单景影像几何纠正的方法,为其他项目的困难区域影像处理提供参考。 相似文献
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针对大范围、短周期卫星影像获取覆盖的难题,本文提出了分区影像统筹的方案。采用影像获取难易程度分区及统筹学的思想,设计第一次全国地理国情普查标准时点核准影像获取及覆盖方案,实现对普查标准时点核准遥感影像任务区的优化覆盖。基于影像获取覆盖的实施结果表明:分区统筹的思想可以针对不同地区制定适宜的影像获取方案。该思想可以应用于新型基础测绘、地理国情监测等测绘任务的影像获取保障工作。影像统筹的方法可以最优化满足任务区的影像需求,最大限度挖掘可用卫星影像资源。 相似文献
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辽宁省地理国情普查项目试点中,采用项目监理制度,质量控制贯穿试点项目始终。监理对提高产品质量起到监督作用,通过现场交流、跟班作业,监理和普查单位对于地理国情普查项目的认识有所提高,在试生产中与普查单位一起总结出正式生产的注意事项。 相似文献
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当前,地理国情普查在我国全面展开,数据采集工作即将完成。未来,普查成果的应用及展示将是地理国情普查的主要工作。本文论述了利用ArcGIS软件,设计、制作地理国情普查图的实现过程,为地理国情普查成果的图形化展示提供了新的思路和方法。 相似文献
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第一次地理国情普查数据采集工作已经临近尾声,如何做好后续数据采集及变化检测工作是一项长期的、具有划时代意义的任务,本文旨在通过对地理国情普查影像数据进行解译、分析、对比,为地理国情普查更新、变化检测提供一种切实可行的工作方法。 相似文献
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Positional Accuracy of TIGER 2000 and 2009 Road Networks 总被引：1，自引：0，他引：1
The Topologically Integrated Geographic Encoding and Referencing (TIGER) data are an essential part of the US Census and represent a critical element in the nation's spatial data infrastructure. TIGER data for the year 2000, however, are of limited positional accuracy and were deemed of insufficient quality to support the 2010 Census. In response the US Census Bureau embarked on the MAF/TIGER Accuracy Improvement Project (MTAIP) in an effort to improve the positional accuracy of the database, modernize the data processing environment and improve cooperation with partner agencies. Improved TIGER data were released for the entire US just before the 2010 Census. The current study characterizes the positional accuracy of the TIGER 2009 data compared with the TIGER 2000 data based on selected road intersections. Three US counties were identified as study areas and in each county 100 urban and 100 rural sample locations were selected. Features in the TIGER 2000 and 2009 data were compared with reference locations derived from high resolution natural color orthoimagery. Results indicate that TIGER 2009 data are much improved in terms of positional accuracy compared with the TIGER 2000 data, by at least one order of magnitude across urban and rural areas in all three counties for most accuracy metrics. TIGER 2009 is consistently more accurate in urban areas compared with rural areas, by a factor of at least two for most accuracy metrics. Despite the substantial improvement in positional accuracy, large positional errors of greater than 10 m are relatively common in the TIGER 2009 data, in most cases representing remnant segments of minor roads from older versions of the TIGER data. As a result, based on the US Census Bureau's suggested accuracy metric, the TIGER 2009 data meet the accuracy expectation of 7.6 m for two of the three urban areas but for none of the three rural areas. The suggested metric is based on the National Standard for Spatial Data Accuracy (NSSDA) protocol and was found to be very sensitive to the presence of a small number of very large errors. This presents challenges during attempts to characterize the accuracy of TIGER data or other spatial data using this protocol. 相似文献
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地理国情监测是测绘部门主动服务科学发展的重要职责和战略任务。本文对陕西省地理国(省)情监测试点的成果进行了系统分析,针对成果管理的需求,结合时空数据库的研究技术,提出了地理国(省)情监测时空数据库建设的技术路线,并对数据库进行了模型设计、概念设计、逻辑设计及管理平台设计。 相似文献
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《制图学和地理信息科学》2013,40(5):321-327
The explosion of computer processing capabilities for manipulating geographic data has produced a concomitant increase in the number of geographic data file formats available. The many formats make it difficult to exchange and manipulate geographic data from several sources, and sometimes even from the same source. The U.S. Bureau of the Census has been a contributor to the “Yet Another Geographic File Format” movement over the past two decades with its Address Coding Guides (following the 1970 decennial census), the GBF/DIME-Files (following the 1980 decennial census), and four different versions of its TIGER/Line files at various times during the 1990 decennial census cycle. The TIGER data base is a massive computer file that provides geographic information about the entire United States and its territories in great detail, down to the individual city block and its component boundary features. Its value to more than Census Bureau activities is enormous. To enhance the value of the TIGER data base, and to make it easier to use, the Census Bureau is releasing the file in the new Spatial Data Transfer Standard (SDTS) format. The benefits of a standard transfer format are manifold. This paper discusses some of the intergovernmental activities that were required before the exchange standard was adopted and some of the problems of implementing the standard within the Census Bureau. The Census Bureau is not alone in its decision to release geographic data files in the SDTS format, and some of the benefits of using the standard for exchanging data among agencies also are described. 相似文献
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开展地理国情普查是从地理的角度全面摸清国情国力基本情况的迫切需要。第一次全国地理国情普查是一项开创性的工作,为确保普查成果质量,国务院普查办组织了6批次过程质量监督抽查,完成了对全国31个省级行政区300余家作业单位普查过程、成果种类与要素的全覆盖检查,在了解和掌握了生产过程质量情况的基础上,查找问题、分析原因,并提出了针对性的整改意见,对确保最终成果的质量提供了有力支持。 相似文献