Patent ID: 7979993

Claim:
A method of laying out a grid of lines or points across an area whether or not symmetrical comprising: a. designating a starting reference point at or near the area based on an a priori known relationship to an existing feature or object at or near the area; b. projecting with a laser beam a first reference line intersecting the first reference point and extending in a direction relative to a first dimension related to the area; c. designating and marking a set of first line reference points along the first reference line with reference to measured distance and the laser beam; d. projecting with a laser beam a transverse reference line from each of the set of first line reference points at least partially across and in a direction relative to a second dimension related to the area and; e. designating and marking a set of second line reference points along each of the transverse reference lines with reference to distance along each transverse reference line and the laser beam at each of said first line reference points; f. so that a grid of lines or points are identified and marked across the area correlated to at least both distance and a laser beam is created; g. taking a measurement of a valve in addition to location for a plurality of said marked reference points.