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J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update ign.fr
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update ign.fr
Qualification of Pleiades stereo pairs for BD Topo® data capture and update
01. The Pleiades satellite system02. Assessment of Pleiades stereo pairs for topographic mapping03. Perspectives for Pleiades operational use at IGN France
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
01. THE PLEIADES SATELLITE SYSTEM
3/
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
01. THE PLEIADES SATELLITE SYSTEM
2 agile satellites placed on the same orbit :
Pleiades 1A launched end 2011, operational since june 2012
Pleiades 1B launched end 2012, operational since feb 2013
Image acquisition :
Heliosynchronous orbit => 10h30 UT time
North-South strips acquired with 20 km swath (300 km maximum length)
Very high on board storage capacity (up to 600 scenes per day per satellite)
Products :
B&W, R,G,B,NIR – GSD 50 cm after processing
Stereo & tri stereo
Mosaics
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
Within 13 days, all orbits are flown either by Pleiades 1A or Pleiades 1B
13 days cycle
Pleiades 1APleiades 1B
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
Every day access to any spot above 50°
latitude with 30°
maximum viewing angle
Pléiades 1A Pléiades 1BPléiades 1APléiades 1B
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
EUROPE : available catalogue at August 25th, 2013
https://geostore.astrium-geo.com/en-EMEA/449-pleiades-coverageMise à jour du 19/02/2013 – PLEIADES 1A et 1B
Scenes with clouds < 10%
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update ign.fr
© CNES Distribution Astrium services
R‐G‐B
NIR‐R‐G
50 cm GSD
The atlantic ocean shore near Bordeaux
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update ign.fr
© CNES Distribution Astrium services
Clearcuts in the Landes forest (south west France)
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update ign.fraerial BD Ortho®
‐
2011 Pleiades
Ortho
–
24th
April
2013
© CNES Distribution Astrium services
The Strasbourg city centre
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
02. ASSESSMENT OF PLEIADES IMAGES FOR TOPOGRAPHIC MAPPING AT IGN IGNSYSTEM
11/
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
02. POTENTIAL USE OF PLEIADES AT IGN
AS A COMPLEMENTARY SOURCE TO AERIAL PHOTOGRAPHY
Orthoimage (BD Ortho®) : speed up the frequency of observation
Orthoimage (BD Ortho®) : save flight hours over mountainous areas
AS A SUBSTITUTE TO AERIAL PHOTOGRAPHY
Emergency : damage assessment (floodings, forest fires, storms, land slides,…)
2D classification of forest species (BD Forêt®)
3D geographic database (BD Topo®) updating : stereo capture of features in vector mode
Height measurement : DTM generation
Change detection, mainly by comparison DEM / DEM
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
02. POTENTIAL USE OF PLEIADES AT IGN
AS A COMPLEMENTARY SOURCE TO AERIAL PHOTOGRAPHY
Orthoimage (BD Ortho®) : speed up the frequency of observation
Orthoimage (BD Ortho®) : save flight hours over mountainous areas
AS A SUBSTITUTE TO AERIAL PHOTOGRAPHY
Emergency : damage assessment (floodings, forest fires, storms, land slides,…)
2D classification of forest species (BD Forêt®)
3D geographic database (BD Topo®) updating : stereo capture of features in vector mode
Height measurement : DTM generation
Change detection, mainly by comparison DEM / DEM
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
Aerial programmeAerial programme27 districts27 districts
acquired at 25 cm GSDacquired at 25 cm GSD
Coverage : 180 000 km2Coverage : 180 000 km2
France’s 2012 national image coverage programme
Coverage : 15 000 km2Coverage : 15 000 km2
Mainland:LozLozèèrereHautesHautes‐‐AlpesAlpesMontMont‐‐Blanc Blanc
(stereo)(stereo)
Overseas :StSt‐‐Pierre et Miquelon Pierre et Miquelon
(stereo)(stereo)MartiniqueMartiniqueGuyane (partly)Guyane (partly)
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
SUMMER 2012 : 6000 KM2 HAUTES-ALPES COVERED WITHIN 2 MONTHS
Specifications :angles < 10°cloudfree
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
BD Ortho® : are hybrid orthoimage (aerial / satellite)feasible and acceptable over mountainous areas ?
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
BD Ortho® : hybrid orthoimage over mountains
Purpose : generate aerial / Pleiades orthomosaics
Test area : Mont-Blanc (the French Alps)
Image data acquired in good conditionsPleiades 50cm: 19th august / angle < 10°Aerial 25cm : 8-11 august / good homogeneity
Results :
the seam line is geometrically non visible
radiometric balance is acceptable
general rendering is correct
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
Results
BD Ortho® : Hybrid orthoimage over mountains
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
POTENTIAL USE OF PLEIADES AT IGN
AS A COMPLEMENTARY SOURCE TO AERIAL PHOTOGRAPHY
Orthoimage (BD Ortho®) : speed up the frequency of observation
Orthoimage (BD Ortho®) : save costly flight hours over high mountains
AS A SUBSTITUTE TO AERIAL PHOTOGRAPHY
Emergency : damage assessment (floodings, forest fires, storms, land slides,…)
2D classification of forest species (BD Forêt)
3D geographic database (BD Topo®) updating : stereo capture of features in vector mode
Height measurement : DTM generation
Change detection, mainly by comparison DEM / DEM
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
POTENTIAL USE OF PLEIADES AT IGN
AS A COMPLEMENTARY SOURCE TO AERIAL PHOTOGRAPHY
Orthoimage (BD Ortho®) : speed up the frequency of observation
Orthoimage (BD Ortho®) : save costly flight hours over high mountains
AS A SUBSTITUTE TO AERIAL PHOTOGRAPHY
Emergency : damage assessment (floodings, forest fires, storms, land slides,…)
2D classification of forest species (BD Forest)
3D geographic database (BD Topo®) updating : stereo capture of network and built up features
Height measurement : DTM generation
Change detection, mainly by comparison DEM / DEM
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
St‐Pierre‐et‐Miquelon Pleiades stereopair May 1st 2012
BD Topo® : are retrieved 3D vector data from Pleiades stereo compliant with data base specifications ?
© CNES Distribution Astrium services
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
Railway NANCY-STRASBOURG
"ribbon" of 100 km x 5 km to be acquired in stereoscopy
5 Pleiades stereo pairs obtained at 4 dates in 2012 and 2013
22/
BD Topo® updating along a High Speed Railway under construction
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update 23/
© CNES Distribution Astrium services
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
Control points
BD Topo® updating along a High Speed Railway under construction
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
Processing and data capture from IGN’s GEOVIEW® software
Pleiades stereo pairs : B/H ratio from 1.3 to 2
Features retrieved in 3D : railway axis, secondary network, hydrography
Results:
Processing duration correct
XYZ accuracy assessed against ground control and geodetic points : better than one meter, matching BD Topo® specifications
Visual comfort is suitable, with slight preference for colour to B&W
Drawback : no possibility to see the objets from several angles of view
Advantage : a large coverage (up to 20x21 km) which reduces switches between several pairs
Vectors obtained have been integrated into the BD Topo® data base
27/06/2013 25/
BD Topo® updating along a High Speed Railway under construction
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update/ 34 26/
Purpose of the study
Generate DTM in montainous area where existing BD Alti® data base is less accurate
Test area Corsica (Bavella) :
3 pairs were acquired on the same area :
2 with 20° roll angle but with 26 days interval
One with low roll angle later
Methodology
Geometric modelling of images
DSM production
Transformation DSM => DTM (existing production line)
Comparison with :
BD ALTI® accuracy > 6 m
INTERMAP (radar data) accuracy about 7 m
Qualified points xyz (geodetic, networks) submetric accuracy
Ground height retrieving by DTM generation
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
Visual rendering
Ground height retrieving by DTM generation
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
Pleiades results are better than existing BD ALTI® and aerial radar
27/06/2013 28/
Ground height retrieving by DTM generation
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
03. PERSPECTIVES FOR PLEIADES OPERATIONAL USE AT IGN FRANCE
29/
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
Progressively update the orthoimage coverage of French Guyana
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
GUADELOUPE : 2035 KM2
30/01/13(Angles 6,8° et
11,8°)
16/01/13(Angles 20° et
17,1°)
23/03/13(Angles 6° et 10,7°)
02/06/13(Angles 118° et
8,1°)
30/01/13(Angles 11,5° et
9,2°)
11/04/13(Angles 11,4° et
7,9°)
11/02/13(Angles 13,8° et
15,7°)
Cover overseas regions in stereoscopy a programme was launched early 2013 over the French West Indies
16/03/13(Angles 13,2° et 13,7°
08/05/13(Angles 11,9° et 11°)
11/03/13(Angles 14,1° et 13,1°
02/05/13(Angles 15,3° et 14,6°
03/03/13(Angles 16,4° et 15,7°
29/03/13(Angles 14,9° et 14,2°
MARTINIQUE : 1895 KM2
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update ign.fr
Monoscopy Stereoscopy
Tasked Covered Geocoded
Assess Pleiades coverage capacity over the mainland in 2013
Tasked Covered Geocoded
status at mid August
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
PLEIADES AT IGN : PERSPECTIVES FOR 2014
33/
Main technical issues are now under control
Other studies to be explored : forest mapping and monitoring
Towards a IGN’s multi year image coverage programme ? the strategy « Pleiades vs airborne » is presently worked
out, taking into account economic and operational aspects
2014 event :
« Pleiades days » in Toulouse 1-3 April 2014
J.Ph. Cantou (IGN France) : Qualification of Pleiades stereo pairs for BD Topo® data capture and update
Pleiades image distribution to French public bodies : IGN will be the national focal point
CNESCNES
Astrium / Spot ImageAstrium / Spot Image
IGNtechnical and contractual support to public bodies
IGNtechnical and contractual support to public bodies
Public services and authorities
Public services and authorities
Coverage
requirements
Academic usersAcademic users
Geocodingdownload facility
archiving
Image taskingValidationPurchase
User requests
filteringTasking
programme optimizing
Monitoring public service delegation
www.ign.frwww.astrium‐geo.frwww.cnes.fr