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~` _ - <br />~~ <br />,,JouClJ6ic~ ' /yliF~+7T <br />TABLE 10.10. Clauifieation of TraV~rtha <br />CLASSIFICATION FlRST ORDEII <br /> <br />SECOND ORDFA / THIRD ORDFa <br />cLAss 1 ttAss I I cuss I cuss ^ <br />RECOMAIENDFD sPALING OF Ne[work stations Principal stations xldom Principal stations xldom Seldom less than 0.1 km in tertiary <br />PRINCIPAL STATpNS 10.15 km. less than 4 km ex«pt in less than 2km ex«pt in surveys in metropolitan area surveys. <br />Other surveys metropolitan area surveys metropolitan area surveys qs required for other surveys. <br />xldom less than where the limitation is where the limitation is <br />J km. 0.3 km. 0.2 km. <br />HORIZONTAL DIRECTIONS OR <br />ANGIFS <br />Instnsment 0' .2 <br />Number of observations 16 <br />Rejection limit from mrJn 4' <br />LENGTH us.cURtTAENTS <br />Standud error 1 part in <br /> 600.000 <br />REgPAOCAl VER71CA1 ANGLE <br />OBSEpVATIOtd <br />Number of and spread <br />between observations 3D/R-10' <br />Number of stations <br />between known <br />elevations 4,..6 <br />ASTAO AZIMUTHS <br />Number of courses <br />betw«n azimuth <br />checks Sfi <br />Numberofobxrvations/night 16 <br />Number of nights 2 <br />Standard error 0'.43 <br />Azimuth closure al azimuth <br />chak point not to exceed f' .0 per station <br /> or 2' ~N <br />PasmoN ct.osuRE 0.04 m ~ or <br />After azimuth adjus[ment I : I000Op <br />0' .2 1' .0 <br />8 or 12' <br />4• s• <br />'May be reduced to 8 ar <br />1 part in <br />700.000 <br />3D/R-10' <br />6-8 <br />0' .2 1" .0 <br />6 1 or 8' <br />4' S" <br />d 4, rcspatively, in metropolitan areas <br />1 part in <br />120,000 <br />2D/R-10" <br />s-lo <br />1'.0 <br />4 <br />5' <br />I part in <br />60.000 <br />2D/R-10" <br />lo-u <br />10.12 IS-20 20.25 <br />16 12 8 <br />2 I 1 <br />0' .45 <br />I' .S per sation or 3" v/N. I' ,S <br />2" .O per sation or 6' ~N. 3" .0 <br />3' .O per station or <br />Metropolitan area surveys Metropolitan area surveri 10' ,~N. Metro- <br />xldom to exceed 2' .0 <br />per station or 3' ,` xldom to exo:ed 4/'';.,0 <br />per station or 8" politan area <br /> J " surveys xldom to <br /> exceed 6' per <br /> station or IS" fN <br />O.OB~Kor 0.2m~or 0.4m~Kor <br />I :50,000 1:20,000 <br />1:10,000 <br />~I~ <br />I' .0 <br />2 <br />5" <br />I part in <br />30.000 <br />2D/R-20" <br />1 s-zo <br />30-40 <br />4 <br />1 <br />8" .0 <br />8' per station or <br />~~ f <br />O.Bm,~Kor <br />1:5,000 <br />