大数据环境下地理信息产业发展的几点思考     

周顺平  徐枫 《测绘软科学研究》2014,(1):45-50

大数据背景下地理信息产业的发展有了新的驱动力,通过思考这种驱动力对产业发展可能产生的影响,分析指出了大数据在地理信息产业中的中心地位和重要价值,综述了大数据给地理信息产业的涵盖范围、关键技术和服务模式所带来的重大变革,探讨了大数据技术对于GIS传统技术优化升级的几个着力点,并剖析了大数据技术在地理信息产业的相关应用中所面临的制约因素。  相似文献   

注册测绘师制度实施有关问题研究     

周星  刘利  刘芳  孙威  贾丹 《测绘软科学研究》2014,(4):1-5

注册测绘师制度的实施有利于规范测绘行为,保证测绘成果质量,意义重大。本文针对注册测绘师制度推进过程中遇到的现实问题进行了调查研究。通过问卷和实地访谈,对注册测绘师签字文件种类,测绘资质单位需配备注册测绘师数量,注册测绘师事务所可行性,注册测绘师制度与现行管理项目关系,注册测绘师考试等相关问题进行了研究和思考,并提出了相关的对策建议,供有关方面在推进注册测绘师制度实施时参考。  相似文献   

Corn Area Extraction by the Integration of MODIS-EVI Time Series Data and China’s Environment Satellite (HJ-1) Data     

Fengmei Yao  Lili Feng  Jiahua Zhang 《Journal of the Indian Society of Remote Sensing》2014,42(4):859-867

In this paper, we intent to use the remotely sensed MODerate resolution Imaging Spectroradiometer (MODIS) data and China’s Environment Satellite (HJ-1) data for extracting the corn cultivated area over a regional scale. The high resolution HJ-1 data was to extract corn distribution at a small scale class with Support Vector Machine (SVM). The mean Enhanced Vegetation Index (EVI) time series curve of corn from MODIS was derived for the reference area and validated in a larger area. The MODIS-EVI time series curve derived from the reference area instead of the MODIS-EVI time series curve derived from the study area after validation, which was taken as the standard MODIS-EVI time series curve in for generating a standard MODIS-EVI image of corn. The mean absolute distance (MAD) between the standard MODIS-EVI image of corn and the MODIS-EVI time series image was used to detect the maximum possible extent of corn distribution in the study area. The results showed that the overall accuracy of the method was 82.17 %, with commission and omission errors of 16.85 and 15.40 %, respectively; at the county level, the satellite-estimated corn area and statistical data were well correlated (R ²?=?0.85, N?=?50) for the whole Jilin Province. It indicated that the MODIS data integrated with higher spatial resolution of HJ-1 satellite data could be utilized to enhance the extraction accuracy of corn cultivated area at a larger scale.  相似文献   

重庆万州区山地分类定量化研究     

熊波  张君  朱永刚  熊峰  李春 《测绘科学》2014,39(11)

文章在GIS技术支持下,基于水文分析模型,通过DEM数据,结合山地综合分类模型,以重庆市万州区为例,对山地进行定量化分类研究,结果表明:以负地形洼地贡献区域作为山地相对高程的起算面,完全摆脱了人为因素的影响,解决了一直以来难以确定山地相对高度起算范围的难题;以负地形洼地深度作为山地相对高程是正确可行的,且能快速获取山地的相对高程;以山地表面积代替投影面积计算山地率更切合实际.  相似文献   

Multi‐Scale Qualitative Location: A Topology‐Based Model     

Shihong Du  Chen‐Chieh Feng  Qiao Wang  Luo Guo 《Transactions in GIS》2014,18(4):604-631

Qualitative locations describe spatial objects by relating the spatial objects to a frame of reference (e.g. a regional partition in this study) with qualitative relations. Existing models only formalize spatial objects, frames of reference, and their relations at one scale, thus limiting their applicability in representing location changes of spatial objects across scales. A topology‐based, multi‐scale qualitative location model is proposed to represent the associations of multiple representations of the same objects with respect to the frames of reference at different levels. Multi‐scale regional partitions are first presented to be the frames of reference at multiple levels of scale. Multi‐scale locations are then formalized to relate multiple representations of the same objects to the multiple frames of reference by topological relations. Since spatial objects, frames of reference, and topological relations in qualitative locations are scale dependent, scale transformation approaches are presented to derive possible coarse locations from detailed locations by incorporating polygon merging, polygon‐to‐line and polygon‐to‐point operators.  相似文献   

增城国土资源数据整合研究     

章冯 《测绘与空间地理信息》2014,(3):189-192

信息孤岛是信息化建设的必经过程,信息共享是智慧城市建设所要解决的重点问题。作为智慧城市的重要组成部分,智慧国土的建设必然需要对国土资源数据进行整合。本文基于现有研究成果,结合增城市国土资源数据的实际情况,提出基于数据仓库的国土资源数据整合方案,并对增城市1∶2 000的空间基础数据进行了有效整合。  相似文献   

IMU/DGPS辅助空三下几种布点方案的精度比较     

荣幸 《测绘与空间地理信息》2014,(5):198-199

主要介绍了在IMU/DGPS辅助空三的情况下,通过对不同的布点方案进行空三加密,对这些空三成果进行精度比较与分析,分析POS辅助空三在无地面控制点或少量的地面控制点的情况下能获得怎样的精度,能满足多大比例尺的成图要求。  相似文献   

建设节约型社会实现可持续发展          下载免费PDF全文

邢攸莉 《山东国土资源》2006,22(6):27-28

2005年3月5日，温家宝总理在十届全国人大三次会议上作政府工作报告时提出，缓解中国能源资源与经济发展的矛盾，必须立足国内，显著提高能源资源利用效率，在全社会形成节约意识和风气，加快建设节约型社会。温家宝总理关于“节约”的论述，开启了中国建设节约型社会的新纪元。  相似文献   

Meso‐scale particle modeling of concrete deterioration caused by alkali‐aggregate reaction     

Jianwen Pan  Y. T. Feng  Feng Jin  Yanjie Xu  Qicheng Sun  Chuhan Zhang  D. R. J. Owen 《国际地质力学数值与分析法杂志》2013,37(16):2690-2705

A meso‐scale particle model is presented to simulate the expansion of concrete subjected to alkali‐aggregate reaction (AAR) and to analyze the AAR‐induced degradation of the mechanical properties. It is the first attempt to evaluate the deterioration mechanism due to AAR using the discrete‐element method. A three‐phase meso‐scale model for concrete composed of aggregates, mortar and the interface is established with the combination of a pre‐processing approach and the particle flow code, PFC2D. A homogeneous aggregate expansion approach is applied to model the AAR expansion. Uniaxial compression tests are conducted for the AAR‐affected concrete to examine the effects on the mechanical properties. Two specimens with different aggregate sizes are analyzed to consider the effects of aggregate size on AAR. The results show that the meso‐scale particle model is valid to predict the expansion and the internal micro‐cracking patterns caused by AAR. The two different specimens exhibit similar behavior. The Young's modulus and compressive strength are significantly reduced with the increase of AAR expansion. The shape of the stress–strain curves obtained from the compression tests clearly reflects the influence of internal micro‐cracks: an increased nonlinearity before the peak loading and a more gradual softening for more severely affected specimens. Similar macroscopic failure patterns of the specimens under compression are observed in terms of diagonal macroscopic cracks splitting the specimen into several triangular pieces, whereas localized micro‐cracks forming in slightly affected specimens are different from branching and diffusing cracks in severely affected ones, demonstrating different failure mechanisms. Copyright © 2012 John Wiley & Sons, Ltd.  相似文献   

Assessment of code bias variations of BDS triple-frequency signals and their impacts on ambiguity resolution for long baselines     

Lou  Yidong  Gong  Xiaopeng  Gu  Shengfeng  Zheng  Fu  Feng  Yanming 《GPS Solutions》2017,21(1):177-186

GPS Solutions - Carrier phase ambiguity resolution over long baselines is challenging in BDS data processing. This is partially due to the variations of the hardware biases in BDS code signals and...  相似文献