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ZHANGZuxun WUJun ZHANGJianqing 《地球空间信息科学学报》2003,6(3):8-15
An effective approach,mapping the texture for building model based on the digital photogrammetric theory, is proposed. The easily-ac-quired image sequences from digital video camera on helicopter are used as texture resource, and the correspon-dence between the space edge in build-ing geometry model and its line feature in image sequences is determined semi-automatically. The experimental re-sults in production of three-dimension-al data for car navigation show us an attractive future both in efficiency and effect. 相似文献
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《测绘学报》1963,(4)
N叭1GeodesyThe marrIX a山。tment by groupsdgreat s。dc nIaDgUhtl。us…………………………………………………………………………………… ,··Chwang Kw。ng-yua。(12)Peay入urarot nccneAoeannH rennypouerpa n onmr ero npnueeeHna………………qareanq。H-c。un,山"at,ro-c。a,BaH raa-6。a,Ca帅。-uatyn,厂aa C。-asn(is)Pe3y厂bTaTN ncnMTaHna reo风HMerpa NASM—Za B paHoHe n刀aTo……………………………………………………………………… … 相似文献
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MushtakTalibJabbar HUGuangdao ZHANGZhenfei 《地球空间信息科学学报》2004,7(3):187-192
The policy of the Chinese government concerning the horizontal expansion of the cultivated land through the reclamation of desert soils result in a total increase of 665. 985 km^2 during the period 1987-1999 in North Shaanxi. This increase is less than the loss in arable land by urbanization. The accelerated rate of change in agricultural areas calls for more rapid surveys of urbanization and loss of arable land. Remote sensing has a number of advantages over ground-based methods for such surveys. The multi-scale concept of remote sensing data help us study the problem in four towns. Several maps were produced to analyze the situation of urban coverage in different times. The evaluation of the status, rate and risk of urbanization are based on an accepted average of urban increase as 2% of population growth per year. 相似文献
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The purpose for this article is to research the relationship between public transportation and real estate based on the area of East Lansing.Two methods are mainly used to analyze the data:correlation analysis and means analysis with the help of Statistical Package for the Social Sciences(SPSS) data analyzing software.There are two analysis results:(1) the real estate,which is closer to public transportation,will have higher value than that is far from public transportation,and(2) the number of bus in one bus stop has no obvious relation with the value of real estate.Based on these results,real estate developers could build residential real estate close to public transportation or bring public transportation in their real estate community by contract with transportation corporations.In sum,they should reasonably use public transportation as attractive features to convince people to prefer to their houses. 相似文献
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XU Tianhe LUO Zhicai 《地球空间信息科学学报》2005,8(3):214-219
The German CHAlleging Minisatellite Payload （CHAMP） was launched in July 2000. It is the first satellite that provides us with position and accelerometer measurements, with which the gravity field model can be determined. One of the most popular methods for geopotential recovery using the position and accelerometer measurements of CHAMP is the energy conservation method, The main aim of this paper is to determine the scale and bias parameters of CHAMP accelerometer data using the energy conservation method. The basic principle and mathematical model using the crossover points of CHAMP orbit to calibrate the accelerometer data are given based on the energy balance method. The rigorous integral formula as well as its discrete form of the observational equation is presented, This method can be used to estimate only one of the scale and bias parameters or both of them. In order to control the influence of outliers, the robust estimator for the calibration parameters is given. The results of the numerical computations and comparisons using the CHAMP accelerometer data show the validity of the method. 相似文献
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SHAZongyao BIANFuling 《地球空间信息科学学报》2005,8(1):57-63
This paper introduces some definitions and defines a set of calculating indexes to facilitate the research, and then presents an algorithm to complete the spatial clustering result comparison between different clustering themes. The research shows that some valuable spatial correlation patterns can be further found from the clustering result comparison with multi-themes, based on traditional spatial clustering as the first step. Those patterns can tell us what relations those themes have, and thus will help us have a deeper understanding of the studied spatial entities. An example is also given to demonstrate the principle and process of the method. 相似文献
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《测绘学报》1962,(4)
NO.lG。odes歹Use of the observational data of dose Eafth satellites for the research of the figureand sravitational field of the Earth…’……………………………、·Fang Tsun(13)ypasnosemHsanne cern rpnanrynattun no cuemaaaouy ueroAy nocpeAcrsenHatx。’””P’“。协…………………………………………·。………………Kv江aa-。。叼(s’)OnN了Hoe BN叮nc刀elllle no acTpoHoMo-rpaD口MeTpn可ecxoMy nnBe刀npoBaH*m B paRo。。。ax Pa。。。H。na B3CM…………··、…,………··C。i Xo… 相似文献
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提供了有关GPS和GNSS的产品信息 ,罗列了 186家生产制造厂和公司名录 ,按首字母的顺序编排 ,用黑体字表述厂商名 ,信息含有国别、联系地址、电话、电传、E -mail和网址等。E FEnuvis395OysterPointBlvd ,Suite 5 0 5SouthSanFrancisco ,CA 94 0 80Tel:(6 5 0 ) 873 4 6 2 5fax :(6 5 0 ) 873 4 6 35info @enuvis.com www .enuvis.comEPPL7 LMICMinnesotaPlanning 6 5 8CedarStreetSt.Paul,MN 5 5 15 5Tel:6 5 1 2 96 12 0 1fax :6 5 1 2 96 12 12ken .pekarek @state .mn .us www .mnplan .state .mn .us/EPPL7Essent… 相似文献
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出行在外最常碰到的挠头事,大概要数急于找到解决“内急”的那一刻了,对于类似出租车司机这些整天在外工作的人群更是如此。他们盼着哪天地图上能标上公共厕所……年前报载北京有位“的哥”画了张公共厕所图,几乎同时,上海正式 相似文献
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星基增强系统(satellite based augmentation system,SBAS)通过地球同步轨道卫星实时播发导航卫星星历改正数和完好性参数,以提升用户定位精度和完好性.采用最小方差法解算GPS星历改正数,利用卡方统计进行改正数完好性检核,并依据星历改正数方差-协方差信息计算SBAS用户差分距离误差(us... 相似文献
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Spatial object and spatial relationship are two basic concepts of GIS.Spatial object is the digital representation of geographical entity or phenomenon,which forms the basis for data management and analysis;spatial relationship is theconnexion between spatial objects when geometric properties are considered.Thecommonly used classification of spatial objects as points,lines and areas is mathe-matically strict,and suitable for data management,but a bit too generalized forrepresenting real entities and extracting spatial relationships.A good classificationmodel should not only be good for representing real entities,but also good for re-vealing spatial relationships,therefore good for formalizing spatial analyses. 相似文献
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LIU Jiyu School of Geodesy Geomatics Wuhan University Luoyu Road Wuhan China. 《地球空间信息科学学报》2007,10(1):1-3
According to our engineering research on satellite-borne laser retroreflector array, some suggestions are proposed on how to manufacture a new Apollo LLRA that can make us measure one illuminating point and unilluminating area on the moon's surface. These suggestions are: to control the dihedral angle offset within ± 0.1″; to use the larger aperture of the transparent face of cube corner prisms; to investigate how to separate out Apollo's reflected laser from mixed beam hitting on the LLR system. 相似文献
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SUI Haigang HUA Li ZHAO Haitao ZHANG Yongli 《地球空间信息科学学报》2005,8(4):262-268
An effective strategy and framework that adequately integrate the automated and manual processes for fast cartographic sounding selection is presented. The important submarine topographic features are extracted for important soundings selection, and an improved “ influence circle” algorithm is introduced for sounding selection. For automatic configuration of soundings distribution pattern, a special algorithm considering multi-factors is employed. A semi-automatic method for solving the ambiguous conflicts is described. On the basis of the algorithms and strategies a system named HGIS for fast cartographic sounding selection is developed and applied in Chinese Marine Safety Administration Bureau （CMSAB）. The application experiments show that the system is effective and reliable. At last some conclusions and the future work are given. 相似文献
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《测绘学报》1988,(4)
Filteringand calculation of DYnamlcParamctcraIn Deformation Model………………………………………Tao Benzao,Yu Jingquan(241)Extrapolatlon of Polar Coordinates with Data OverShort Period of Time………………………………………………Xiao Naiyuan et al.(247)Dynamic Surveying system and Kalman Filtering………………Liu Dane,Yu Zhenglin(254)Station Coordinates RGOSC.LG4 Derived From Laser Ranging Data to LAGEOSof the MERIT Main Campaign……Xia Jiongyu,Sinclair,A.T,Appleby,G.M.(26… 相似文献