MEASUREMENT TARGET TOP-SURFACE ESTIMATION METHOD, GUIDE INFORMATION DISPLAY DEVICE, AND CRANE

The present invention estimates the top surface of a measurement target on the basis of a data point group that corresponds to the top surface of the measurement target and is obtained using a laser scanner. A data processing unit 70: selects two data points p·p from the data point group P which is contained within the thickness d in the vertical direction of a hoisting load region WA, and calculates the distance L1 between the selected two data points p·p; determines the two data points p·p are located in the same plane and calculates the gravitational center G1 for each point determined to be in the same plane when the distance L1 between the two points is equal to or less than a threshold r1; searches for a nearby point which is a data point p for which the distance from the gravitational centers G1 is equal to or less than the threshold r1, determines the nearby point is also in the same plane when said nearby point is discovered, and repeatedly performs the process in order each time a nearby point is discovered; obtains multiple data points p determined to be in the same plane; and estimates plane clusters CL1 representing the top surfaces of a hoisting load W and an object C on the basis of the multiple data points p.