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Preventive archaeology since 2001 : a complex process
that will not be detailed here
Scientific
Guidance
CNRA
Evaluations
decision by
prefect
Opinion of CIRA
CIRA appraisal
Excavations decision &
scientific specifications
By prefect
Delivered
by the operator
to the Prefect
construction
project
Research
Evaluations
Evaluations
report
Excavations
Delivery
to the Prefect
Validation choice
of the operator
+
Designation
of responsible
Transmission
To the CIRA
Excavations
report
Definition of
scientific
guidance of
archeology
Approved
operator
Preventive archaeology : In reality, two UAVs usage
contexts
construction
project
Prior knowledge: aerial surveys, etc.
Small and medium scales
Evaluations
Evaluations
report
1. Field and test
excavation data
Medium scales
Excavations
Excavations
report
2. photograph and statement
of remains
Medium and large scales
Evaluations
(trial trenching )
Areas of sometimes several dozen hectares
Interest UAV systems for:
-general topography
-mass plan
-volumetry (trench / excavated material)
-…
excavations
Areas often of the order of one hectare
Interest UAV systems for:
-topographic survey after scraping
-mass plan and detailed plans
-archaeological and natural remains
-…
Shooting with an aerostat:
An already enough
resolution to build a mass
plan
Pont-sur-Seine (Aube)
« Haut de Launoy »
Why this documentation
has rarely been exploited
for this?
Applications for Preventive archaeology : especially
photography and photogrammetry
Photography and Photogrammetry by dense
correlation are particular activities
the most obvious. But other applications
should not be neglected.
aircraft
5 m cable
-multispectral photography
-thermal camera
-LIDAR
-magnetic survey
-etc.
magnetometer
The intervention contexts are essentially
open areas,
But other situations may arise.
-dangerous ruins
-various cavities, galleries, underground
quarries,
-underwater approaches
-etc.
2011: Testing with the company Aero Kyu
Helicopter UAV "RWOP" manual control
with a Samsung WB560 camera
Airplane UAV type "Cybird"
Accuracy and resolution: which needs? what guarantees?
Visual comparison of vertical projections of 3D models for 3 different
acquisitions in false colors
We need to better control the useful precision
which essentially depends on the conditions
of photographic shot
Recording of data
Locate with a known precision
the area of each photo
Internal first experimental phase : equipment
Quadricoptère
total weight< 2kg
Cat D
current statement
"Go anywhere"
Long flights (10-25 min)
Go Pro
Hexacoptère
total weight< 4kg
Cat E
Quality Statement (architecture, etc.)
specific constraints
Short Flights (9-15 min)
APN
Réflex
preventive archaeology and Inrap
Inrap is a national structure but
organized according to the french
administrative regions
evaluations
1 784 done
2013 :
excavations
261 done
> potential of several
thousands of drone missions
per year
2 main difficulties:
-Dispersal of the actors
9 directions in region
41 archaeological research centers
-Different regional practices
What organization? What procedures?
For us, the questions are more
complex than for a small private company
organization:
-national?
-régional?
Decisions and responsibilities?
Overall monitoring?
Selection and training of pilots
(voluntary archaeologists)
What quality control?