简介:Thesimilaritytransformationmodelbetweendifferentcoordinatesystemsisnotaccurateenoughtodescribethediscrepancyofthem.Therefore,thecoordinatetransformationfromthecoordinateframewithpooraccuracytothatwithhighaccuracycannotguaranteeahighprecisionoftransformation.Inthispaper,acombinedmethodofsimilaritytransformationandregressiveapproximatingispresented.Thelocalerroraccumulationanddistortionaretakenintoconsiderationandtheprecisionofcoordinatesystemisimprovedbyusingtherecommendedmethod.
简介:ThispaperfocusesontheintegrationanddatatransformationbetweenGPSandtotalstation.ItemphasizesonthewaytotransfertheWGS84Cartesiancoordinatestothelocaltwo-dimensionalplanecoordinatesandtheorthometricheightGPSreceiver,totalstation,radio,notebookcomputerandthecorrespondingsoftwareworktogethertoformanewsurveyingsystem,thesuper-totalstationpositioningsystem(SPS)andanewsurveyingmodelforterrestrialsurveying.Withthehelpofthissystem,thepositionsofdetailpointscanbemeasured.
简介:Thispapercalculatestheparametersofimagepositionandorientation,proposesamathematicalmodelandadoptsanewmethodwiththreestepsoftransformationsbasedonparallelrayprojection.Everystepofthemodelisstrict,andthemapfunctionofeachtransformationisthefirstorderpolynomialsandothersimplefunction.Thefinalcalculationoftheparametersisforthelinearequationswithgoodstatus.Asaresult,theproblemoftherelativityofimageparametercalculationissolvedcompletely.Someexperimentsarecarriedout.
简介:AuthorshavestudiedthetransformationprocessesofcoldairoverlandinEastAsiaforeightcaseswhichoccurredindifferentmonthsof1981.First,thesurfaceeddysensibleandlatentheatfluxes,anddragcoefficientwereestimatedaccordingtotheapproachofsimilaritytheory.Then,theapparentheatsource,theapparentmoisturesink,andsolarandlong-waveradiativeheating(orcooling)werefurthercalculatedthroughthebudgetmethodandphysicalparameterizationalgorithm.Ithasbeenfoundthatthecoldairimmediatelystartsthetransformationprocessoverlandonceitmovesawayfromitsregionoforigin.Inwinter,thedegreeoftransformationofcoldairmassgraduallyintensi-fiedasittravelledsoutheastward;whilearrivingintheocean,thecoldairmassunderwentthemostsignificanttransfor-mationprocess.Insummer,themostvigoroustransformationofthermalandmoisturefieldswasobservedinNorthChinaandMongolianregion,withmuchgreaterintensitythanthatinwinter.