HLJCORS系统性能测试与分析     

张洪文  赵忠海  关沧海  马传宁  蔡伟 《测绘与空间地理信息》2017,(12):115-118

通过定位精度测试、可用性测试和兼容性测试,本文分析评估了HLJCORS的实时和事后定位精度、空间可用性、时间可用性以及兼容性。测试表明,HLJCORS测试精度均达到或优于设计要求,可为黑龙江省建立统一的现代化测绘基准提供重要支撑。  相似文献   

地形改正与地形直接影响的转化关系   总被引：1，自引：0，他引：1  

马健  魏子卿  沈忱  彭克曼 《测绘科学技术学报》2017,34(3)

传统的第三边值问题的解算方法有Molodensky算法和Stokes-Helmert算法两种。在Molodensky算法中使用的地形改正和Stokes-Helmert算法中使用的直接影响均由大地水准面外地形产生,因而必然存在关系。本文通过推导给出了直接影响是地形改正、层间改正与压缩地形影响3项之和的结论。在此基础上,给出了直接影响的质量线平面积分算法、质量棱柱平面积分算法和地形改正的球面积分算法。此外本文还推导了布格球冠层间改正算法。通过实验得出,直接影响的质量线平面积分算法和质量棱柱平面积分算法与传统球面积分算法的差异分别为3.81和1.64 m Gal;地形改正球面积分算法与传统质量线、质量棱柱平面积分的差异分别为3.92和1.69 m Gal。该结果说明,本文推导的直接影响与地形改正的关系式是正确有效且实用的。  相似文献   

PPGIS approach for defining multimodal travel thresholds: Accessibility of popular recreation environments by the water     

《Applied geography (Sevenoaks, England)》2017

It is essential to ensure equal accessibility to services, such as sport and recreation facilities or green and water environments. Differences in accessibility can potentially cause negative health and social welfare implications. Accessibility and service area analyses from the perspective of access equality are typically rather simple. They are often based on arbitrary travel-distance thresholds and made only with a single mode of transport in mind. Thus, they exclude the multidimensional nature of accessibility where individuals' travel behavior and perceived accessibility also play an important role. In this paper, a PPGIS method was used to empirically investigate distances and durations that respondents travel with different modes of transport to access popular water environments. Service area analyses were built on person-based and objectively measured threshold values that not only take into account the spatio-temporal elements of transport networks and a land use component but also recognize the requirements and preferences of individuals and their capacity to access and participate. The results showed that the most common mode of transport to access waters is walking. Generally, the residents travel by foot for 1.7 km to access water environments. Cars were found as the second most common mode of transport used, and most of the popular water environments are accessible by car from every corner of the study area in a given travel threshold time. The results demonstrate the importance of deriving local parameters and the potential of the PPGIS approach for accessibility and service area delineation.  相似文献   

Extending the conversation on socially engaged geographic visualization: representing spatial inequality in Buffalo,New York   总被引：1，自引：1，他引：0  

Jin-Kyu Jung  Christian Anderson 《Urban geography》2017,38(6):903-926

This paper is situated at the intersections among GIS and geovisualization, critical social theory, and urban studies. It presents an analysis of housing segregation and unequal food and transportation access in Buffalo, New York. We demonstrate how the representation and examination of this socially complex multi-scalar issue benefits from deliberate, reflexive conversation between different critical social-spatial epistemologies. We begin with a relatively simple GIS analysis of spatial segregation and arrive through critical iteration at a more qualitatively nuanced cartogram which moves beyond representations of fixed space to reveal a much more relational situation—a case of “time-space expansion” in which the travel time needed to meet a basic daily need is much greater for the poor and people of color than it is for whiter, more affluent populations. We conclude by infusing this narrative with additional considerations from social theory to show how even a limited visualization such as ours might better critically engage broader social and discursive processes in and across urban space.  相似文献   

基于ETM+影像的绿地信息提取方法研究   总被引：1，自引：0，他引：1  

鲍新雪  王晓红  吴丛  杨松  刘芳诚 《测绘工程》2016,(10):26-30

文中以ETM+影像为数据源实现对贵阳市某城区的绿地信息提取。对获取的影像进行预处理,分别通过不同的方法:原始波段组合法、主成分分析法(PCA)、独立分量分析法(ICA)、归一化植被指数法(NDVI)及基于第一独立分量的实验室波段组合法,获取研究区的假彩色合成影像。将以上方法得到的影像数据进行对比分析,表明植被景观目视效果最好的是原始波段组合法。将得到的影像数据进行监督分类,通过目视解译的方法进行精度评价,结果表明,基于第一独立分量的实验室波段组合法绿地信息提取精度最高,是一种有效的绿地信息提取方法。  相似文献   

基于空间句法的游憩地客流量分析——以长沙市为例     

张伟伟  申瑞瑞  阎友兵  孙霞 《测绘科学》2016,41(2):103-108,120

休闲农庄拥有充足客流量是其生存和发展的根本,对影响因素与客流量的关系进行量化,能够为休闲农庄的发展规划、经营决策、选址和集群化发展提供数据支持。针对现有研究采用定性的方法探讨休闲农庄规划及管理中存在的问题,该文通过专家访谈法获取影响农庄客流量的两个关键因素为特色和交通,基于空间句法和GIS集成分析长沙市空间形态特征;通过集成度量化星级休闲农庄的交通条件,分析其与农庄的客流量的关系,并结合其他影响因素对农庄的持续发展提出优化措施。结果表明:休闲农庄的集成度与因交通而产生的客流量具有相关关系,集成度越高,客流量越大;结合空间句法分析结果和休闲农庄的经营数据进行综合分析,可发现城市各星级休闲农庄的优劣势,以引导其健康快速发展。  相似文献   

陆态网测站高精度解算分区方案     

万军  成英燕  党亚民  王虎  李兵 《测绘科学》2016,41(4):1-4,23

中国大陆构造环境监测网络由260个连续全球定位系统观测站点和2 000个不定期全球定位系统观测站点构成,一般采用GAMIT或Bernese高精度数据处理软件进行处理。由于GAMIT及Bernese软件对测站数处理能力的限制,必须对陆态网连续运行基准站进行分区解算。针对这一问题,为研究不同分区方案对陆态网解算精度的影响,该文基于全国55个陆态网络连续运行基准站数据,采用整网解算方案以及间距分区法和区域子网划分法分别进行解算,并以整网解算结果作为标准值,对比两种分区方案与整网解算方案的基线长度差及坐标差。结果表明,间距分区方案解算精度比区域子网划分方案精度高,可实现对陆态网分区的高精度解算。最后利用间距分区法对全国240个陆态网络连续运行基准站进行分区解算,得到了较高精度的解算结果。  相似文献   

A simple predator-prey model of exploited marine fish populations incorporating alternative prey     

Spencer  Paul D.; Collie  Jeremy S. 《ICES Journal of Marine Science》1996,53(3):615-628

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INVESTIGATION ON MAKING MEMBERSHIP FUNCTION OF WATER MASS FROM MIXING MODIFIED PROCESS     

李凤岐  苏育嵩  喻祖祥  王凤钦 《中国海洋大学学报(自然科学版)》1989,(Z1)

A water mass in the sea area under investigation is defined as a fuzzy subset in the discourse universe. Possible forms of membership function of water masses in the mixing modified process are discussed with the mixing theory for conservative concentration of sea water. It may provide bases for making membership functions. Results in this paper may be extended and applied to shallow water. Examples and discussion are given in this paper.  相似文献   

A study of transient responses of a submerged spherical shell under shock waves   总被引：1，自引：0，他引：1  

Cho-Chung Liang  Ching-Yu Hsu  Wen-Hao Lai 《Ocean Engineering》2001,28(1):22

Based on a procedure which couples the finite element method with the doubly asymptotic approximation, this work addresses the problem of the transient responses of a submerged spherical shell subjected to strong, plane, incident shock waves, in which elastoplastic material behavior is considered. Simulation results indicate that the procedure adopted shows good agreement with related literature, which considered linear elastic behavior of the shell. Also presented herein are the time histories of surface pressure, radial velocity and von Mises stress of the shell. Moreover, deformation diagrams and spreading of the plastic zone of the shell are described as well.  相似文献