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简介:ThispaperdescribestheuseoftheArc/InfoandArcViewGIStoolstoestimatesoilerosionwithUniversalSoilLossEquation(USLE).Calculationsarebedonebyusingcapabilitiesavailable.Thisstudystartwithadigitalelevationmodel(DEM)ofShaanxi,whichwascreatedbydigitizingcontourandspotheightsfromthetopographicmapon1∶250000scaleandgridthemesfortheUSLEKandCfactors.ItisnoteworthythatUSLEKcanbeobtainedbyaddingtheKfactorasanattributetoasoiltheme'stable.TheCcanbeobtainedfromtablesorusingtheinformationaboutlanduseandmanagementgivenbyUSLEprogram.AlandusethemecanbeusedtoaddtheCfactorsasanattributefield.ThepurposeofthisstudyistoestablishspatialinformationofsoilerosionusingUSLEandGISanddiscusstheanalysisofthesoilerosionandslopefailuresinGISandformulatethepossibleframework.
简介:Positionalerroroflinesegmentsisusuallydescribedbyusing'g-band',however,itsbandwidthisinrelationtotheconfidencelevelchoice.Infact,givendifferentconfidencelevels,aseriesofconcentricbandscanbeobtained.Toovercometheeffectofconfidencelevelontheerrorindicator,byintroducingtheunionentropytheory,weproposeanentropyerrorellipseindexofpoint,thenextendittolinesegmentandpolygon,andestablishanentropyerrorbandoflinesegmentandanentropyerrordonutofpolygon.Theresearchshowsthattheentropyerrorindexcanbedetermineduniquelyandisnotinfluencedbyconfidencelevel,andthattheyaresuitableforpositionaluncertaintyofplanargeometryfeatures.
简介:Withrapidscientificdevelopmentandfurtherexplorationtowardsthenature,thehumankindhopestoservethemselvesbymasteringthenaturallaw.CountriesallovertheworldsetmuchvalueonthestudyofAntarcticaandhaveobtainedplentyandsubstantialachievements.SoastostrengthenmutualunderstandingamongthecountriesinAntarcticsurveyingandmappingandsharetheachievements,the'InternationalGISWorkshoponAntarcticKingGeorgeIsland',Wuhan,July6th~7th,2000wassuccessfullyheldintheLectureHalloftheNationalLaboratoryforInformationEngineeringinSurveying,MappingandRemoteSensing(LIESMARS).ItwasjointlyheldbytheNationalResearchCenteronAntarcticSurveyingandMappingandLIESMARS,andsponsoredbytheNationalPolarRegionInspectionOffice,NationalNaturalScientificFoundationCommittee,theStateBureauofSurveyingandMapping,theformerWuhanTechnicalUniversityofSurveyingandMapping.
简介:这研究的主要目的是在伊拉克的南部的部分的一个代表性的区域在最后20年期间加亮环境变化指示物(Basrah省作为一个盒子被拿)可伸缩理解用印射的1:250000导致了普遍环境降级现象的主要原因。遥感和GIS软件被用来分类Landsat在1990的TM和在进五的2003形象的LandsatETM+打使用和陆地盖子(LULC)班:植被土地,沙陆地,城市的区域,闲置的陆地,和水身体。监督分类和规范的差别植被索引(NDVI),规范的差别逐渐增加索引(NDBI),规范的差别水索引(NDWI),规范的差别咸度索引(NDSI),并且表层土谷物尺寸索引(GSI)在这研究被采用并且分别地过去常检索它的班边界。结果在植物的盖子(514.9km2)和沙沙丘累积(438.6km2)的增加显示出清楚的恶化,为10.1,和10.6%的财务,分别地全部的学习区域。另外,在水身体区域的减少被检测(228.9km2)。沙区域累积在全部的学习区域增加了,与年度增加扩大率(33.7km2???????????吗??
简介:Therearemainlyfourkindsofmodelstorecordanddealwithhistoricalinformation.Bytakingthemasreference,thespatio-temporalmodelbasedoneventsemanticsisproposed.Inthismodel,accordingtothewayfordescribinganevent,alltheinformationaredividedintofivedomains.Thispaperdescribesthemodelbyusingthelandparcelchangeinthecadastralinformationsystem,andexpoundsthemodelbyusingfivetablescorrespondingtothefivedomains.Withtheaidofthismodel,sevenexamplesaregivenonhistoricalquery,tracebackandrecurrence.Thismodelcanbeimplementedeitherintheextendedrelationaldatabaseorintheobject-orienteddatabase.
简介:Onthebasisoftheprinciplesofsimplerandomsampling,thestatisticalmodelofrateofdisfigurement(RD)isputforwardanddescribedindetail.AccordingtothedefinitionofsimplerandomsamplingfortheattributedatainGIS,themeanandvarianceoftheRDarededucedasthecharacteristicvalueofthestatisticalmodelinordertoexplainthefeasibilityoftheaccuracymeasurementoftheattributedatainGISbyusingtheRD.Moreover,onthebasisofthemeanandvarianceoftheRD,thequalityassessmentmethodforattributedataofvectormapsduringthedatacollectingisdiscussed.TheRDspreadgraphisalsodrawntoseewhetherthequalityoftheattributedataisundercontrol.TheRDmodelcansyntheticallyjudgethequalityofattributedata,whichisdifferentfromothermeasurementcoefficientsthatonlydiscussaccuracyofclassification.
简介:Uptonow,detailedstrategiesandalgorithmsofautomaticchangedetectionforroadnetworksbasedonGIShavenotbeendiscussed.Thispaperdiscussestwodifferentstrategiesofautomaticchangedetec-tionforimageswithlowresolutionandhighresolutionusingoldGISdata,andpresentsabufferdetectionandtracingalgorithmfordetectingroadfromlow-resolutionimagesandanewprofiletracingalgorithmfordetectingroadfromhigh-resolutionimages.Forfeature-levelchangedetection(FL-CD),aso-calledbufferdetectionalgo-rithmisproposedtodetectchangesoffeatures.SomeideasandalgorithmsofusingGISpriorinformationandsomecontextinformationsuchassubstructuresofroadinhigh-resolutionimagestoassistroaddetectionandextractionaredescribedindetail.
简介:一、前言在城市综合管网GIS数据生产中,由于管线的属性信息、空间信息数据量大,利用桌面数据库管理难度很大,数据质量很难得到保障,且不利于大规模生产的需要。经过多方论证:在Delphi平台下利用ActiveX自动化技术开发的客户/服务器(c/s)数据库应用程序,其中ADO技术、OLE技术、ActiveXAutomation技术等这些软件开发的尖端技术的应用,使该系统具备数据处理能力大大增强。选用MicrosoftSQLServer2000作为数据库平台,不仅使该系统能管理海量数据,支持更多的客户端,而且成为大规模的管线生产后台数据库。大量数据字典的采用是在没有统一的管线代码的情况下,建立自己的一套管线生产代码标准,不仅提高了作业效率,保证管线属性的完整性、规范性,更好地满足客户多元化需求,适应各种GIS环境。系统为MapGISSYNPIP(城市综合管网信息管理系统)提供了良好的接口,更方便数据入库,这样对于利用SYNPIP中小城市来说,利用该系统可以进行管线生产及后期系统维护,使管线数据生产及维护更快捷。