Lub hauv paus ntsiab lus ntawm kev sib tw dav hlau yog parallelism txhais tau tias "Tag nrho cov rays kos los ntawm ntau yam ntsiab lus yuav tsum dhau los ntawm qhov chaw soj ntsuam". Kev Taw Qhia: Kev ntsuam xyuas lub rooj dav hlau yog ib txoj hauv kev ntawm kev sojntsuam uas qhov kev soj ntsuam thiab kev npaj ua tiav ib txhij.
Dab tsi yog kev siv lub dav hlau daim ntawv ntsuam xyuas?
Ib lub rooj dav hlau (lub rooj dawb ua ntej xyoo 1830) yog ib qho cuab yeej siv hauv surveying site mapping, exploration mapping, coastal navigation mapping, and related disciplines to provide a solid and level surface on which to make daim duab kos duab, kab kos thiab daim duab qhia chaw.
Yuav ua li cas yog txoj kev ntawm lub dav hlau daim ntawv ntsuam xyuas?
Muaj plaub txoj hauv kev ntawm kev soj ntsuam lub dav hlau, hluav taws xob, kev sib tshuam lossis triangulation, kev hla, thiab kev txiav tawm.
Lub ntsiab lus ntawm lub rooj dav hlau yog dab tsi?
: ib qho cuab yeej muaj qhov tseem ceeb ntawm daim duab kos duab ntawm lub koob yees duab nrog tus pas ntsuas taw qhia ntawm cov khoom pom thiab siv rau kev teeb tsa cov kab ntawm kev tshawb fawb ncaj qha los ntawm kev soj ntsuam.
Lub dav hlau lub rooj tshuaj ntsuam xyuas nws qhov zoo yog dab tsi?
Qee qhov zoo ntawm kev soj ntsuam lub dav hlau yog: (i) Nws yog ib txoj hauv kev nrawm tshaj plaws ntawm kev soj ntsuam(ii) Cov ntawv sau tsis tas yuav tsum tau, thiab yog li qhov ua yuam kev hauv booking yog tshem tawm. (iii) Kev ntsuas cov kab thiab cov ces kaum feem ntau yog dispensed nrog vim lawv tau graphically.