简介:AnimprovedtopographicdatabaseforKingGeorgeIsland,oneofthemostfrequentlyvisitedregionsinAntarctica,ispresented.AfirststepconsistedincombiningdatafromdifferentialGPSsurveysgainedduringtheaustralsummers1997~1998and1999~2000,withthecurrentcoastlinefromaSPOTsatelliteimagemosaic,topographicinformationfromexistingmapsandfromtheAntarcticDigitalDatabase.Fromthisdatasets,adigitalterrainmodel(DTM)wasgeneratedusingArc/InfoGIS.Inasecondstep,asatelliteimagemapatthescale1∶100000wasassembledfromcontourlinesderivedfromtheDTMandthesatellitemosaic.Alackofaccuratetopographicinformationintheeasternpartoftheislandwasidentified.AdditionaltopographicsurveyingorSARinterferometryshouldbeusedtoimprovethedataqualityinthatarea.TheGISintegrateddatabasewillbeindispensableforglaciologicalandclimatologicalstudiesandadministrativeandscientificpurposes.Infuture,theapplicationofGIStechniqueswillbemandatoryforenvironmentalimpactstudiesandenvironmentalmonitoringaswellasformanagementplansonKingGeorgeIsland.
简介:DTM(DigitalTerrainModels,简称DTM)土石方计算法,是指利用实测地形碎部点、特征点进行三角构网,用以计算给定区域内的土石方量。目前,该方法已广泛应用于工程测量领域的土方平衡和计算工作。在北京地区首次将DTM土石方计算法应用于非法开采矿产资源价值鉴定中,并以北京市顺义区木林镇非法开采建筑用砂石矿为例,通过方法应用、过程研究、计算分析等工作,准确计算了该地区建筑用砂石矿的非法开采量,与非法开采行为人供述的盗采方量吻合,得到了相关部门的认可。研究表明,DTM法能够准确计算非法开采矿产资源的数量,在非法开采矿产资源价值鉴定中具有良好的应用前景。
简介:摘要:大唐河北发电有限公司马头热电分公司9、10号锅炉8台低速钢球磨煤机入口螺旋套管存在严重磨损问题,使用寿命短,经过研究分析论证,对螺旋套管进行防磨改造,改造后经过对比,使用寿命延长显著,取得了良好的效果,对同类型磨煤机入口螺旋套管防磨改造具有借鉴意义。
简介:Background:Anexaminationofthedistributionofancientcharcoalkilnsitesintheforestlandscapeseemstobeworthwhile,sincegeneraltrendsintheselectionofsuitablekilnsitelocationsinthepastmightbecomeobvious.Inthiswayforestlandscapeelementswithamoreintenseusagebycharcoalburningcanbeidentified.Bydoingthis,wecanexpecttogaininformationontheformerconditionandtreespeciescompositionofwoodland.Investigationsonthespatialdistributionofcharcoalkilnsitesinrelationtolandscapeattributesaresparse,however,probablyduetothehighon-sitemappingeffort.TheoutstandingsuitabilityofLiDAR-deriveddigitalterrainmodels(DTMs)forthedetectionofcharcoalkilnsiteshasbeenrecentlyproved.Hence,DTM-basedsurveysofcharcoalkilnsitesrepresentapromisingattempttofillthisresearchgap.Methods:BasedonDTM-basedsurveys,weanalyzedthespatialdistributionofcharcoalkilnsitesintwoforestlandscapesintheGermanfederalstateofHesse:ReinhardswaldandKelerwald-EderseeNationalPark.Indoingso,weconsideredthelandscapeattibutes'treespeciescomposition','watersupplystatus','nutrientsupplystatus','soilcomplexclasses','altitude','exposition',and'inclination'.Results:WefoundthatcharcoalkilnsiteswereestablishedpreferablyonhilsidelocationsthatprovidedoptimalgrowingandregenerationconditionsforEuropeanbeech(Fagussylvatica)duetotheiracidicbrownsoilsandsufficientwatersupply.Theseresultsareinlinewithinstructionsfortheselectionofappropriatekilnsitelocations,foundinliteraturefromthe18thtothe19thcentury.Conclusions:Weconcludethattherewerewell-stocked,beech-dominateddeciduousforeststandsinnorthernHessebefore1800,particularlyatpoorlyaccessiblehillsidelocations.TheselargestocksofbeechwoodwereutilizedbythegovernmentsofthedifferentHessianterritoriesthroughtheestablishmentofironworksandhammermills.Ourargumentationiswellinline