1.
Using drones to assess flood
damage at one of
largest mines

2.
In May 2014, Serbia was hit by massive
floods following the heaviest rainfall there
since records began.

3.
Several rivers broke
their banks, completely
flooding some of the
.

4.
The overflowing of the river
Kolubara also flooded part
of the Kolubara Mine Basin,
approximately 45 km (28
miles) south of Belgrade.

5.
The Kolubara pit is a huge 9 km2 (3.5 mi2)
pit, part of an
estimated 540,000,000 tonnes of lignite
reserves in the Kolubara mining fields.

6.
GeoGIS Consultants to supply accurate 2D
orthomosaic images & digital terrain models
(DTMs) of the flooded section of mine, in
order to calculate the best method of
draining the remaining water from the site.

7.
And to plan a new river channel in order to
change its direction and prevent such
problems happening again in future.

8.
So why did GeoGIS
decide to work
with a drone?

9.
Speed
#1

10.
Using classical surveying methods, such as
LiDAR or total stations, would have been
slow, and therefore expensive.
a terrestrial approach might have
taken 3on-site teams around 2 months.

11.
High-resolution
imagery
#2

12.
Satellite images could have been an option,
except that GeoGIS needed higher data
resolution than they offered.

13.
How did
GeoGIS do it?

14.
They planned
their flight,
setting the
ground
resolution to
7 cm (2.75 in)
per pixel in
the
eMotion
software.

15.
They also set 25 ground control points, plus
additional field points, using independent GPS
receivers & continuous kinematics.
These measurements enabled them to fine-tune
using MicroSurvey CAD and ArcGIS.

16.
3 staff then performed
6 eBee flights.
Each flight lasted approximately
33 minutes and captured
between 180 and 250 images.

17.
Since the client was very focused on
getting their data quickly, GeoGIS
managed to set all the GCPs, plan the
flights and fly them all in one day.

18.
The result?

19.
The client received the data products it
required within a week and was full of
praise for GeoGIS

20.
particularly with the data turnaround
Aleksandar Milosavljevic, geodetic engineer, GeoGIS

21.
1 Flight
planning
2 Setting GCPs 3 Flights
4 Data
processing
Point cloud
filtering/classifying
/cleaning
Point cloud
feature extraction
& DTM creation
Drawing
preparation (CAD)
PROJECT WORKFLOW

22.
PROJECT STATISTICS

23.
To learn more about drones in mining, visit:
www.senseFly.com/applications/mining
To read the full report of this project, visit:
https://www.sensefly.com/fileadmin/user-
cases/2015/senseFly-Case-Study-Mine-Flood-
Mapping-Serbia.pdf
And GeoGIS Consultants are online at:
www.geogis.co.rs