Patent ID: 8826553
Filing Date: 2014-09-09
Classification: G01C

Abstract:
1. Layout method for locating a plurality of positions at a construction site, comprising: positioning a laser transmitter at a known position at said construction site, transmitting wirelessly an instruction to said laser transmitter from a remote control device, identifying a position to be located, projecting a beam of green laser light and a parallel beam of red laser light horizontally from said laser transmitter on a heading toward said position to be located, placing a retroreflective target rod in the paths of said beam of green laser light and said beam of red laser light, said retroreflective target rod having retroreflective material over substantially the entire length of said rod, sensing the reflection of said beams from said rod to said transmitter, transmitting wirelessly to said remote control from said laser transmitter an indication that said target is in the path of said beams, transmitting wirelessly to said remote control from said laser transmitter the distance between said transmitter and said target rod, and the distance and direction which the rod is to be moved to reach said position to be located, moving said retroreflective target rod toward said position to be located, and transmitting wirelessly to said remote control from said laser transmitter an indication that said target rod had reached, and is located at, said position to be located.