1) The document discusses using LIDAR airborne techniques to create a high resolution digital terrain model (DTM) of the Romanian Danube Plain to assess major flood risks in the region. 2) LIDAR data was collected over 7000 square kilometers along the 1075km Romanian section of the Danube River to generate a DTM with vertical accuracy of 5cm and horizontal accuracy of 3-5 points per square meter. 3) The high resolution DTM will enable more accurate flood hazard mapping and hydrologic simulations to improve flood risk management and assessment in the Romanian Danube Plain region.

1. Global Risk Forum – IDRC - DAVOS 2008
LIDAR Based High Resolution Numerical Terrain Model
Basic Tool for Major Flood Risk Assessment
Romanian Danube Plain
PUBLIC PRIVATE
I. Balin, I. Nichersu, M.
Memier , R. Stiuca, E.
Marin , L. Galisson, N.
Libralesso, M. Mierla,
A. Covasnianu, M.M.
Cazacu, D. Constantin ,
Contact EnviroScopY SA
D Balin,
IN
ioan.balin@enviroscopy.com
…………………..
CD
Phone +41 21 693 9000
DD
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2. PROBLEM ???
• Floods Spring 2006 - extreme event?
• Humans and $$$ dimensions
• MMDD (RO) - new defense dams&lines
SOLUTION !!!
• RE consideration of Danube Flood Plain
– Risk Management and Assessment
• DTM – Digital Terrain Modeling
– LIDAR airborne technique
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3. Environmental Ministry and Sustainable development
of Romanian government :research study :
23.11.2006 for 15.12.2007
Danube Delta National Institute of Research and
Development Tulcea – Romania
Collaborators:
PUBLIC INHGA – Bucharest (RO)
ISPIF – Bucharest (RO)
EnviroScopY SRL (ESY- RO)
EnviroScopY SA ( ESY- CH)
PRIVATE
-SINTEGRA ( FR)
Co-Sponsor Communications : Vodafone S.A.
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4. GP al t sate
GPS double frequency
re
S ime llite
REAL TIME
co
rr fro s
ec m
GPS BASED
tio th
ns e
in
Inertial device
Navigation System
Laser
scanning
GPS double frequency
reference station
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5. REELD (Economical and Ecological
Reconstruction of the Danube Flood Plain )
EMERGENCY of Field Campaign
• Surface Requested: 7000.000 ha
• Surface Wide is variable: 1 to 80 km
• Length 1075 km (Danube in Romania)
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6. The principle of LIDAR technique
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7. Airborne
LIDAR
PartenAvia (APEI SA)
DTM-LIDAR flight parameters Value
Flight alltitude 450 m
Speed flight 45 m/s
Band width 520 m
20%
Lateral coverage bands/Overlapping
Distance between bands 415 m
Laser emmision frequency 65 kHz
60 (+/- 100)
0
Scanning angle
Scanning frequency 75 Hz
(Standard deviation) total planimetric precision 20 cm 4-5
of the measured laser points pts/m2
2
Medium density of laser points 3-5 pts / m
Medium distance between laser points (flight direction and 0,6 m
perpendicular)
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8. Flight tracks along the Danube river-Romanian section of the river
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9. ©ESY2008 Copyright

10. s
ng
GALATI SHIPYARD i
ild
Bu
e
ub Digital Terrain Model (DTM)
n
Da GROUND (no vegetation)
plan
ted f
o rest
m
Da
se
en
f
De
TULCEA
AREA
es
e
Tr
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11. TOPOGRAPHICAL PROFILES
-SAMPLES-
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12. QUANTITATIVE
DATA
Profile - Channel
(transversal)
Profile Danube
(transversal)
Profile Channel
(longitudinal)
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13. Bands from LIDAR: length of
15 km and width of 500 meters
each
The intensity of LIDAR signal’s
echo („albedo”). Danube - black
color in the left, that means lack
of LIDAR signal.
Altitude- Danube in black color,
the higher areas – green to
red.
Altitude class i.e. low vegetation
Ground DTM: see clearly the
Danube, the hills
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14. 3D Area : Mehedinti Sample
View of the Western section of Danube Plain : “Portile de Fier” to Maglavid
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15. FLOOD HYDROLOGIC SIMULATION
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16. Conclusion (s)
Done 650.000 ha
• Delta Z = 5 cm
• Delta X/Y = 3-5 points/m2
• 1 point for each inhabitant of the EARTH !
To be done:
(1) Absolute Z – RO calibration STEREO 70 ?!
(2) Danube Delta extension !!!
Contact EnviroScopY SA
ioan.balin@enviroscopy.com
Phone +41 21 693 9000
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