工程测量简答题.docx

工程测量简答题.docx工程测量简答题Theuniversity'smeasurementissimpleWhatistheearthlevel?Whatareitsfeaturesandfunctions?Throughalevel,theaverageseasurfacecalledgeoid,itscharacteristicislevelanypointonthesurfaceofplumblineperpendiculsrtothesurfaceofthepoint,isasurfacegravity,?MeasuringcoordinatesystemXisthenorth-southdirection,towardthenorth,theXaxisdirectionY,Yaxistowardtheeast,ordingtoclockwisechoreography,?Howisthegaussianplanerectangularcoordinatesystemsetup?Supposedahorizontalellipticalcylindersetoutsidetheellipsoid,ylinderaxisthroughthecenterofellipsoid,andcentralmeridianandtheellipsoidaprojectionwiththetangent,nearthecentralmeridian(thatis,thingsedgemeridianrange)onthesurfaceoftheellipsoidpointprojectiononahorizontalellipticalcylinder,ylindricalpolarbuswillunfoldastheplane,theplaneiscalledgaussprojectionplane・,thecentralmeridianprojectionfortheXaxis,theequatorprojectiontoYaxis,twoaxisintersectionpointastheoriginofcoordinates,azoningofindependentgaussplanerectangularcoordinatesystem・Whatisthespatialpositionofthegroundinmeasuringwork?Ingeodesy,thegroundonabitofspaceisrepresentedbyplanecoordinatesandelevation,pointofplanecoordinatescanbedividedintoplanerectangularcoordinates(x,y)oordinates(precision,latitude)・monmeasurement?Thebasictaskofgeneralmeasurementismapping,settingandmonitoring・Whatarethebasicmeasurementsofgroundpoints?Distancemeasurement,angularmeasurementandelevationmeasurement・uracyofthemeasurements?umulationofmeasuringerrors,toensurethecorrectnessofthemeasurementresults,,elevationdiffereneebetweentwopoints,,feetonthereadingis1526mm,feetonthereadingis1182mm,elevationdi