Lasermapper DTS – Direct Terrain Scan
Surveying of Stretched Dam Construction
Accquisition of Isar dam near Pullach / Munich with light-weighted UAV (below 5 kg).
- Flight time 3.5 minutes
- Lenght 650 meters
- 180.000 points
Digital Elevation Model of River Landscape
River landscape of Isar south of Großhesseloher Brücke / Munich. Scanned area 1.6 hectares.
- Classical traverse scan (all area)
- Stationary area scan (square upper right)
- Precise nadir scan (rectangle right)
Classical Traverse Scan for efficient area accquisition
The area (circa 250 x 65 meters) has been overflown 20 meters above ground with three stripes.
Horizontal scan angle was 50 degrees, resulting a scan width of 20 meters.
These values are a good compromise in terms of accuracy which is far better than 10 centimeters in position and height.
With a flight duration of about five minutes, 300.000 points were accquired.
The UAV has been „parked“ 30 meters above ground and a two-axis area-scan has been undertaken.
The area is about 30 x 30 meters and within 30 seconds about 30.000 points have been accquired.
This operating mode is most suitable for stationary mounting of the scanner, e.g. on poles.
Repeated scans provide elevation models which may be used for continous volume determination.
Precise Nadir / Profile Scan
The UAV was flown 30 meters above ground along three lines, the scanner measured vertically without scan movements.
The vertical measurements are independent of UAV attitude due to two-axis gimbal compensation and provides
accuracies of 2-3 centimeters in position and altitude. Within a flight duration of 90 seconds, about 90.000 point have been accquired.
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Real-time Processing and Subsequent Use of Data
Immediatelly during scanning, data is processed and transferred to the cloud server.
Data can be visualizated directly on-site (depending on available GSM bandwidth) and analyzed with apps after the flight.
Future apps include:
- volume determination
- Comparison of profiles
- Tracking data
Naturally data also can be exported in common formats and used in your standard tool environment.
Here georeferenced data (ETRS89, URM32N) was imported into QGIS for further processing:
Surveillance of Railway Ramp Area (Stationary Scan)
The lasermapper has been mounted onto a pole with 15 meters height aside a railway ramp area.
Every 15 minutes an area-scan with 180.000 points has been performed (duration 3 minutes)
The excerpt along a street shows changing allocation of parking lots: