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1、CHAPTER3–POINTCLOUDPROCESSINGSOFTWARE______________________________________________________________________CHAPTER3–POINTCLOUDPROCESSINGSOFTWAREPointcloudsbythemselvesarenotusefulwithoutsoftwaretoprocessthedataandmakemeasurementsandothercalculations.Also,inordertobeuseful,thepointclouddatanee
2、dstointerfaceeasilywithComputerAidedDesign/Drafting(CADD)andslopestabilityprograms.Thissectiondiscussesthepointcloudfileformat,pointcloudprocessingsoftware,andinterfacingbetweenpointcloudsoftwareandotherCADDandslopestabilitysoftware.THEPOINTCLOUDFILEAsdiscussesinChapter2,thepointcloudisthebas
3、icoutputfroma3Dlaserscanner.Themostgenericpointcloudfileformatisa3Dcoordinatefile(oftenreferredtoasanxyzfile).TheformatforthisfileisASCIIandcanthereforebereadbyallpost-processingsoftware.Thecommaortab-separatedformatforagrayscale3Dcoordinatefileisasfollowswithonelineforeachlaserpoint:Grayscal
4、epointcloud:x1y1z1intensity1x2y2z2intensity2…Thex,yandzvaluesrefertoaspecificcoordinatesystem.Ifthepointcloudisnotregistered,thenbydefaulttheydirectionismostoftensettotheinstrumentdirection.Afterregistration,thex,yandzdirectionsaremostoftensettoEast,Northandup,respectively.Howeverthesesystems
5、arenotuniversalandthescannerorsoftwaremanufacturershouldbecontactedforinformationontheirspecific3Dcoordinateformats.Theintensityforeachpointhasavaluethatrangefrom0(black)to255(white).Similarly,thecommaortab-separatedformatforanrgb(red,greenblue)3Dcoordinatefileisasfollows:Colorpointcloud:x1,y
6、1,z1,r1,g1,b1x2,y2,z2,r2,g2,b2…Herer,gandbeachhavevaluesthatrangefrom0to255.BecausethexyzfileisASCII,thesefilesareslowtoreadandwrite;theyalsoonlycontainthebasicpointcloudinformation.Ingeneral,eachscannermanufacturer,andalsoeachpointcloudprocessingsoftwaremanufacturer,hastheirownspecializedbin
7、aryformat.Someexamplesoffileextensionsassociatedwithdifferentbinaryformatsaregivenbelow.Scannermanufacturer:Leica:.coeRiegl:.3dd9CHAPTER3–POINTCLOUDPROCESSINGSOFTWARE______________________________________________________________________Pointc
