We are pleased to inform you that Topodrone team together with Filminera mining company successfully carried out project for UAV survey over Masbate Gold Project area located on Masbate Island Philippines
Survey was made by Topodrone upgraded DJI PHANTOM 4PRO PPK and DJI MATRICE 200 PPK drones over the following areas:
- ROMpad area (140 000 sq.m)
- Main Vein Pit (200 000 sq.m)
- Main Vein Pit Wall 3D survey
Step.1
Different types of flights missions were designed (Pic.2, Pic. 3)
Step.2
The base station was installed on the point with known coordinates, ground check points were marked and measured (Pic. 4,5)
Step.3
Photos were captured by DJI PHANTOM 4 PRO PPK and DJI MATRICE 200 PPK
Step. 4
After flight raw GNSS data were download from drones and the base station and post processed in RTKlib and Toposetter software in order to get precise coordinates of each photo
Step.5
Photogrammetric processing, 3D model and orthomosaic generation. The accuracy of model were checked with using ground check points (Tab.1,2).
Table 1. Accuracy report ROMpad
| #Label | X | Y | Z | Error_(m) | X_error | X_error | Z_error |
| GC1 | 29436.09 | 25455.36 | 1062.941 | 0.041656 | -0.01529 | -0.03871 | 0.001728 |
| GC2 | 29424.71 | 25481.87 | 1062.678 | 0.044686 | 0.037046 | 0.021721 | 0.012354 |
| GC3 | 29462.4 | 25470.99 | 1063.142 | 0.036729 | 0.031004 | 0.019692 | 0.00017 |
| GC4 |
29474.0 |
25494.37 | 1063.164 | 0.033717 | 0.001213 | 0.011139 | 0.0318 |
| GC5 | 29461.39 | 25534.23 | 1063.135 | 0.026046 | -0.003 | 0.023188 | 0.011474 |
| Base | 29491.3 | 25240.93 | 1123.200 | 0.023857 | 0.000045 | -0.01259 | 0.020267 |
Table 2. Accuracy reportе Main Vein Pit
|
#Label |
X | Y | Z | Error_(m) | X_error | Y_error |
Z_error |
|
1 |
29809.288 | 25338.7987 | 1050.3999 | 0.038513 | 0.011266 | 0.035448 | -0.009989 |
| 2 | 29962.4151 | 25340.0493 | 1040.1786 | 0.030702 | -0.008612 | 0.018132 |
-0.023231 |
|
3 |
29814.733 | 25397.4027 | 1039.9323 | 0.026568 | 0.008551 | 0.02318 |
-0.009768 |
As a result precise & highly detailed 3D model, DEM and contour lines were created
Conclusion
Designed by Topodrone solution turns consumer DJI drones to professional survey tools and provides high accurate 3D datasets which can be used for inventory tracking, precise volume calculating and site surveying.
Upgraded DJI drones by Topodrone team have the following advantages:
High-precision. Survey grade GNSS receiver integrated with 20 MP camera allows to record photos locations with centimeter level accuracy.
High-performance. Up to 3 sq.km/day of high-detailed and accurate maps and 3D models.
Stable solution for mountain areas. Post Processing Kinematic (NOT RTK) techniques allow to work without direct connection between drones and a base station that is very vital in mountains areas.
Costs saving. Doesn’t need to lay down GCPs or just minimize their number, saving countless hours and labor costs.
Easy to use and process data in Photoscan or Pix4D, etc. software and turn your images into highly detailed georeferenced 2D maps and 3D models with up to 3 cm x,y,z accuracy without need to lay ground control points.
