经度和纬度Longitudeandlatitude.docx
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经度和纬度Longitudeandlatitude.docx
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经度和纬度Longitudeandlatitude
经度和纬度(Longitudeandlatitude)
经度和纬度(Longitudeandlatitude)
latitudeandlongitude
Thechangelawoflatitudeisthattheequator(0degreeslatitude)increasestotheSouthandNorthpoles.Thegreatestlatitudeis90degrees,attheSouthPoleandtheNorthpole.
Thenorthoftheequatorlatitudeiscalledlatitude,with"N";southoftheequatorlatitudeiscalledlatitude,with"S".
Totheequatorastheboundary,theearthisdividedintotheaverageSouthandnorthtwohemispheres,northoftheequatoristhenorthernhemisphere,southoftheequatoristhesouthernhemisphere.
Thevariationoflongitude:
fromtheprimemeridian(0degreesoflongitudeWesttoEast),increasingto180degrees.
Theprimemeridianeastlongitudecalledeastlongitude,with"E";westoftheprimemeridianoflongitudeWest,with"W".
TheEast,theWesternHemispheredivisionis20~W,160~Ecomposedofthemeridiancircle.
20degreesW,Westto160degreesE,belongstothewesternhemisphere(greaterthan20degreesWorgreaterthan160degreesE)
20degreesW,eastto160degreesE,belongingtotheeasternhemisphere(lessthan20degreesWorlessthan160degreesE).
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GEIL(Geil)
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Longitudelongitudedividesinto360,1timeevery15degrees,0degreesiscalledtheprimemeridian,isthefirsttoenteranewday,thenwestevery1timezonesis1hours.Forexample,it's5inthemorning,thena4pointwestzoneisinthemorning,after1timeisinthemorning3points,andsoon,totheEastistheoppositetotheprimemeridian,thatistosaytheprimemeridianonbothsidesjustadifferenceof23hoursfromtheequatortothetwolevel,moreandmorehigh.Theequatorislatitudethedividinglineoflatitudeandlongitude1degreesnorthandSouthHemispheretwo=60division=3600seconds,thesixtybandisChaldaiccustom,wearestillinusetoday,aslongastheangleisthesameonandround.Thelatitudeoftheequatoris0degrees,andtheplanetsaredividedintothesouthernhemisphereandthenorthernhemisphere.Latitudereferstothelineandintotheearth'sequatorialplaneandthecenteroftheearthatapointofplaneangle,itsvalueisbetween0to90degrees.Locatedinthenorthoftheequatorpointlatitudecallednorthlatitude,denotedasN,islocated
inthesouthoftheequatoratthelatitudelatitudeknownasS.Thelatitudevalueiscalledthelowlatitudeareabetween0and30degreeslatitudeareavaluebetween30to60degreesintheareaknownasthemiddlelatitude,thelatitudevalueiscalledthehighlatitudesbetween60to90degreesinthearea.Theequator,theTropicofCapricorn,theTropicofcancer,theAntarcticCircleandtheArcticcirclearespecialparallels.Alengthof1secondlatitude;thetotalmeridianlengthoftheearthisabout40008km.Average:
1degreeslatitude=about111kmlatitude1=1.85kmlatitude1=aboutabout30.9meditthissectionoflatitudeandlongitudecalculationmethodofanyplaceonearth,aslongasthereisonlyatable,abamboopole,atapemeasure,youcanknowthelocallatitudeandlongitude.Butthewatchmustbecheckedagainstthecountry'sstandard.Themethodisasfollows:
first,forexampleinthetwoChinabarsomewhere,mostshorttimeisatnoonand13:
20,andtherodlengthandshadowlengthratioof1,whilethelandis45degreesnorthlatitude(TGa=1),longitude100degrees(from120degreesin1hoursminus15degrees,4minutesminus1degreeslongrod)andshadowlengthratiotablesearchforalpha,herewithaspecialangle.Thenthetwosolsticelongitudealgorithminvariantlatitudeinthenorthernhemispherewintersolsticesummersolsticealphaalpha+23.5degrees,-23.5degreescorrectionvaluecanbeonanyonedayand.Thecorrectionvalueisthenumberofdaysfromthetwoalgorithms:
ortwotopoormultipliedby94/365.suchastodayisFebruary17th,33daysandMarch22ndequinox,thesunpointinlatitude33degrees*94/365=8.5sotodayatnoonthelatitudeis(arctgalpha+8.5)~TGalpha=length/long.
Thelongitudeis=85.39km,longitudeis=1.42km,longitudeis
1second,=23.6m
GPSusageskills
I.BasicknowledgeofGPS
1,GPSprinciple
GPSistheabbreviationofGlobolPositionSystem(GlobalPositioningSystem),establishedbyAmericangov-ern-ment,andprovidesfreeservicestoglobalusers.ThecompleteGPSsystemisdividedintotwoparts:
Heavenandearthintheskyhas24moonsinthenon-stop,theearthinanycorner,atleastyoucanseemorethan3satellites;intheundergroundishand-heldorvehiclemountedGPSreceiver,whichiswhatweoftensayGPS.
WhentheGPSreceiverreceivesthreeormorethanthreesatellitessignal,wecancalculatethecoordinatesoftheearthwherethereceiverreceived,iffoursatellitescanalsocalculatetheelevation,atthesametime,thetimesignalofsatellitesystemaretransmittedtotheGPS,ifyouwanttowatch,GPStimeisthemostreliable.
Itshouldbenotedthat,inadditiontotheUnitedStatesGPSsystem,RussiaandEuropehavealsoestablishedtheirownglobalpositioningsystem,butthemostcommonapplicationistheUnitedStatesGPSsystem.
Thecoordinatesystemusedby2andGPS
Whenwedescribegeographicallocation,thecommonlyused
methodislatitudeandlongitudecoordinates.ThecoordinatesystemoflatitudeandlongitudeisthezeropointoflongitudeandlatitudeinEngland,Greenwichandequatorrespectively.Chinaislocatedapproximatelyeastof70120,North-degreerange,locatedinXinjiang.
IntheGPSsystem,thelatitudeandlongitudeofthedisplaycangenerallybebasedontheirownpreferences,generallyhave"hddd.ddddd"(degrees),"hddd*mm.mmm"(degrees.Points),"hddd*mm","SS"(degrees.Minutes.Seconds).Degrees,minutes,secondsofthehexadecimalis60,butthedegrees.Degrees,points,thedivisionis100hexadecimal,thispointintheconversiontopayspecialattentionto.
Theearthmeridian(fromthepoletothenorthpole)is39940.67kilometerslong,thelatitudeis110.94kilometersatonetime,onedividesinto1.849kilometers,onesecondis30.8meters,andthedistancesbetweenthedifferentlatitudesarethesame.
Theearth'sequatorlengthof40075.36km,BeijingandUrumqiintheareaaround40degreesnorthlatitude,latitudecirclelength40075*sin(90-40),sothelongitudewas85.276kilometers,1.42kilometersasecond,23.69meters.
3,GPSaccuracyandSApolicy
Intheory,theprecisionoftheGPStothemeterlevel,theYankeesforsecurityreasons,artificiallylimitedcivilianGPSlongitudepositioning,formulateSApolicy(SelectiveAvailability,aUSDepartmentofdefenseandtheimplementationofmeasurestoreducetheaccuracyoftheGPS,SA)whenthe
implementationofthepolicy,thepositioningaccuracyisonly20-30meters,butthecurrentSAthepolicyhasbeencanceled,thepositioningaccuracyofcivilianGPScanreach10meters.
Whenmorethan4validsatellitesignalsarereceived,theGPScanachievethree-dimensionalpositioning,thatistosay,theelevationofGaoChengcanbecalculated,butIfeelthattheelevationofGaoChengisnotreliable.
4,handheldGPShowtolocate?
ThegeneralGPShasboththeMARKkeyandtheGOTOkey.MARKkeyforpositioning,coordinatethatiscurrenttomemory,GPSwillautomaticallyhaveanameforthispoint;GOTOfornavigation,ifthereisaknownpointhasbeenstoredintheGPSmemory,andthename,thenpressGOTO,selectthepointname,youcancalculatethestraightlinedistancefromheretotheknownpoint.MARKandGOTO(thatis,locationandranging)arethemostbasicfunctionsofGPS,andotherfunctionsarebasedonorservedbythem.Generallyspeaking,aslongasyouknowhowtoturnonandoff,youknowhowtonavigateandnavigate.Youcanhandleitoutdoors.
5,GPScoordinatesystemcomputerformat
Icanstore500pointsinmyGPS,andsomeGPShavedatalines.Theycantransferthestoredpointstothecomputer,andviceversa.Inthisway,thedatainGPSissafe(imaginetheamountofworkyoucandotocopy300GPSpointsontopaper!
).AftertheGPSpointisimportedintothecomputer,itcansetuptheGPSpointdatabasethroughcertaindataconversion,anditis
convenienttouse.Ofcourse,youcanalsosorttheGPSpointsmanuallyintofilesonyourcomputerandthensavethemtoGPS,whichismucheasierthantypingontheGPS.Notonlythat,ifthecomputersystemhasGISsoftware(GeographicInformationSystem)andelectronicmap,GPSwaypointscanalsobeprojecteddirectlyontotheelectronicmap.Buttheprocessiscomplicated.
GARMINGprovidesaMAPSOURCEsoftware,withtheglobal1:
4000000electronicmap,canbedirectlyGPSpointprojectiontotheelectronicmap,butforoutdoorenthusiasts,nouseofelectronicmap1:
4000000.
Acompletesuiteofcomputerdatalines,includingdatalines,satelliteantennas,on-boardpowersupplies(connectedtocigarettelighter),MAPSOURCEsoftware,andelectronicmaps(orGISsoftwareandprofessionalelectronicmaps).
Two,GPSandmapwiththeuseof
Inoutdooractivities,themostcommonmapscalesare1:
250000and1:
100000.The1Cmonthemapcorrespondto2.5kmand1kmofactualdistance,respectively.(abouttheoutdoormap,therewillbeaspecialintroduction.).WiththeuseofGPSandmap,therearethefollowingtwosituations:
oneisbeforestartingtofindthetargetpointonthemap(suchasthecampandanimportantinflectionpoint)coordinates,andputitintoGPS(weinputasetofGPSpointsin2001onCheshitrail.);theotherisinoutd
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