Z-Lab team undertook a topography surveying and mapping project, the project duration was tight and the output demands were high. All the outputs will be compared with the ultrasonic radar equipment developed by the client.

Job Description

Job Target: 1:500 topographic survey for data filing

Job Location: Chongqing, China

Job Time: Dec, 2020

Area Size: 1.84 sq.km

Job Demand

Accuracy Expectation: elevation 10 cm

Output Demand: point cloud, DEM

Submission Time: 2 weeks

Challenge: ravine, tower crane

Field Work

Survey Solution: Hexacopter Matrice600 Pro + SZT-R250

Number of Flight: 20 flights

Take-off Point: 5 spots

Flight Altitude: 20m - 80 m range

Strip Interval: 50 m

Data capture: 5 days (4 hours allowed to fly per day)

Flight Skyway Strips Display

Flight mission in the day                                       Flight mission at night   

During the flight strips                                           Landing at night          

Take-off                                       Landing                                    Pre-flight

Office Work

Data Processing: 7 days 

Output1: geo-referenced point cloud

Output2: DEM

Accuracy Verification: V. below 5 cm

Number of Checkpoint: 105 points by GNSS RTK measurement (red icons)

Checkpoint K26                         Checkpoint K19                         Checkpoint K4   

Checkpoint Report in TerraSolid:

root mean square 0.044 m

standard deviation 0.038 m