# US 2025/0093155 A1 · Survey data processing apparatus, survey data processing method and survey data processing program

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- Number: US 2025/0093155 A1
- Document ID: US20250093155A1
- Status: Published application
- Kind: A1
- Application number: 18/961,601
- Filed: 2024-11-27
- Published: 2025-03-20
- Earliest claimed: 2021-03-29
- Assignees: Topcon Corporation
- Applicants: Topcon Corporation
- Inventors: Takeshi SASAKI; Hideki MORITA
- Web page: https://patentgrep.com/patent/US20250093155A1

## CPC

- G01C 15/002: {Active optical surveying means (optical plumbing G01C15/105)}
- G01S 5/16: using electromagnetic waves other than radio waves
- G01S 7/4808: {Evaluating distance, position or velocity data}
- G01S 17/42: Simultaneous measurement of distance and other co-ordinates (indirect measurement G01S17/46)
- G01S 17/89: for mapping or imaging
- G06F 2218/08: Feature extraction
- G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S)
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A method and apparatus for determining the position of a laser scanner using one or more optical targets, each arranged at a known point. The apparatus includes: a ground control point position obtaining part which obtains information of arrangement positions of multiple optical reflection targets; a laser scanner approximate position data obtaining part which obtains an approximate position of a laser scanner; a laser scanning data obtaining part which obtains data of multiple luminescent points; a processing objective point extracting part which extracts multiple luminescent points having luminance exceeding a specific threshold value; and a laser scanner position calculating part which gives data of the arrangement position of the optical reflection target to each of the extracted multiple luminescent points so as to calculate position of the laser scanner.

## Claims

### Claim at position 1

1-4. (canceled)

### Claim 5

A survey data processing method comprising steps of:
performing primary laser scanning by a laser scanner in a range containing multiple optical reflection targets of which arrangement positions are known;
extracting luminescent points of reflection light from the multiple optical reflection targets among laser scan data obtained by performing the primary laser scanning;
performing secondary laser scanning in the multiple optical reflection targets based on the luminescent points of the multiple optical reflection targets;
calculating position of the laser scanner by the backward intersection method based on each measured position of the multiple optical reflection targets obtained by the secondary laser scanning; and
calculating position of each point in the laser scan data obtained by performing the primary laser scanning based on the calculated position of the laser scanner.

### Claim 6

A non-transitory computer recording medium storing computer executable instructions that, when executed by a computer processor, cause the computer processor to perform operations for a survey data processing program, comprising:
performing primary laser scanning by a laser scanner in a range containing multiple optical reflection targets of which arrangement positions are known;
extracting luminescent points of reflection light from the multiple optical reflection targets among laser scan data obtained by performing the primary laser scanning;
performing secondary laser scanning in the multiple optical reflection targets based on the luminescent points of the multiple optical reflection targets;
calculating position of the laser scanner by the backward intersection method based on each measured position of the multiple optical reflection targets obtained by the secondary laser scanning; and
calculating position of each point in the laser scan data obtained by performing the primary laser scanning based on the calculated position of the laser scanner.