üks punkt mahuti seina sisepinnal asuvast punktide kogumist, mille kaldkaugust, horisontaalset ja vertikaalset nurka mõõdetakse elektro-optilise kauguse mõõteseadme suhtes, one of a series of points on the inside surface of the tank shell wall to which slope distance, and vertical and horizontal angles are measured by use of the electro-optical ranging instrument