Revolutionary Aerial survey solution with DJI Phantom 4PRO PPK provides up to 2 cm accuracy in India

Topodrone Russia and Matrix Geo Solution India are delighted to introduce the result of composite study done by Institute of Photogrammetry & Geo-Informatics (IPGI), Matrix Geo solutions along with Topodrone Russia concludes, that the upgraded DJI PHANTOM 4PRO PPK drone not only achieves an accuracy of 3-5cm RMSE consistently, but also has potential to achieve an accuracy up to 2cm RMSE, without the need of Ground Control Points.

DJI Phantom + RTK/PPK based Drone, delivers reliable ground accuracy that may be considered as a true alternative to ground control points.

Please read the following case study for more details.

STEP-1. Select Test Area

A test area has been selected, outside of No Flying zone of airports (pic.1). The area was about 110 000 sq. m. (11 hectares), covered by only one battery for every flight altitude ranging from 60/100/150 meters.

Pic.1 Area of interest

STEP-2. Set up of Check Points & Base Station

The base station REACH RS+ GNSS receiver has been installed on the point with known coordinates.

The Check Points have been placed and measured in RTK mode by second REACH RS+ (Rover) in evenly distributed manner throughout the test area to establish the check control points.

Pic.2 Base station

Pic.3 Measuring coordinates of checkpoints

Pic 4. Checkpoints location

STEP – 3 Flight Mission & Aerial Image Acquisition 

Three missions were planned at 60, 100, 150 meters’ altitude with 85% along and 70 % across overlapping, flights were performed with up to 9 m/s speed.

Pic.5 Flight planning

STEP – 4  Data Processing

After all the flights, set of raw images and raw GNSS data were downloaded from the drone and the base station.

The data was converted into Rinex format and post processed by RTKLIB application and as a result precise coordinates of images exposure were received that were further embedded to photos by TOPOSETTER application.

Datasets from different flight altitudes, i.e. 60, 100, 150 respectively were photogrammetrically processed by Photoscan software without using any Ground Control Points.

After processing, the checkpoints coordinates were imported into the Photoscan project and checked for the accuracy of each flight.

The data has also been checked into Traditional Stereo Photogrammetry workstation and the result was found well within 3-4 CM accuracy.

In all the Missions, the results were well within 3-4 CM Accuracy.

Tables for the result against the GCP’s

Table 1. Height 60m

Table 2. Height 100m

Table 3. Height 150m

Conclusion The above results from flights of different altitudes, show that the accuracies achieved are well within two pixel of GSD and hence passes the criteria of the National Standard for Spatial Data Accuracy (NSSDA).

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