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FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 1
Potential and limitationsof remote sensing
for cadastre and land management
Potentiel et limites de la télédétectionpour les applications foncières
Laurent PolidoriÉcole Supérieure des Géomètres et Topographes
Conservatoire National des Arts et MétiersFrance
FIG 2011Marrakech, May 2011
Traditional use of remote sensingfor land managementUsages traditionnels de la télédétectionpour les applications foncières
Technological improvementsand benefits for land managementAméliorations technologiqueset retombées pour la gestion foncière
New possibilitiesNouvelles applications possiblesde la télédétection dans le domaine foncier
Conclusion
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 2
1 Traditional use of remote sensing for land managementUsages traditionnels de la télédétection
pour les applications foncières
First aerial photograph by Nadar (Paris, 1860)
Aerial photography for land management : a long history
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 3
Applicationsof remote sensing
AgricultureUrban planningResource monitoringNatural hazard assessmentEpidemiologyArcheology
Informationprovided by remote sensing
2D / 3D geometryDescription of land coverEvidence of land use
Advantagesof using remote sensing
Survey is often faster and cheaperTraditional cadastral mapping is limited to boundariesRemote sensing provides a visual support
Human settlements generate patterns under two influences
SPOT-4, Macapa, Brazil
A. Spatial expression of a land policyB. Presence of natural constraints
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 4
US / Mexico border deforestation in the Brasilian Amazonia
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 5
Requirement 1
Definition of a 2D « geometry » on the Earth surface
- Measurement possibilities
- Topological rules
Requirement 2
Existence of suitable sensors to describe the Earth surface :
- Suitable scale
- Suitable spectral domain
2 Technological improvementsand benefits for land management
Améliorations technologiques
et retombées pour la gestion foncière
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 6
1
10
100
1000
1970 1975 1980 1985 1990 1995 2000 2005
Ré
so
luti
on
sp
ati
ale
(m
)Radar
ERS
RADARSAT
ENVISAT
Panchromatique
SPOT
IRS
IKONOS
Hyperspectral
TERRA
ORBVIEWMSS
AVHRR
SPOT
SPOT 4/5
Multispectral
SPOT4/VGT
Pléiades (© CNES)
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 7
Ground resolutionOpens new possibilities for urban planningDrawback : heterogeneous data bases
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 8
Ground resolutionOpens new possibilities for urban planningDrawback : heterogeneous data bases
Location accuracyReduces need for ground control points
Ground resolutionOpens new possibilities for urban planningDrawback : heterogeneous data bases
Location accuracyReduces need for ground control points
Stereo capabilitiesDTM available for image rectification3D location
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 9
acquisition parameters
digital elevation model
aerial photograph Orthophoto
A standard product- for permanent data bases- for one shot projects
Ground resolutionOpens new possibilities for urban planningDrawback : heterogeneous data bases
Location accuracyReduces need for ground control points
Stereo capabilitiesDTM available for image rectification3D location
Digital informationAutomated aerotriangulationAutomated image rectificationGIS has become a standard environment
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 10
A geodata base
A query language
A toolbox (computation, display etc.)
GIS = standard environment
Ground resolutionOpens new possibilities for urban planningDrawback : heterogeneous data bases
Location accuracyReduces need for ground control points
Stereo capabilitiesDTM available for image rectification3D location
Digital informationAutomated aerotriangulationAutomated image rectificationGIS has become a standard environment
InternetPublic data bases
hhh
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 11
Institut Géographique National Direction Générale des Finances Publiques
www.geoportail.fr www.cadastre.gouv.fr
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 12
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 13
3 New possibilitiesNouvelles applications possibles
de la télédétection dans le domaine foncier
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 14
1.Virtual boundary delineationDélimitation virtuelle
The boundary in defined in an rectified image
Virtual delineation will never replace a surveyor
Limitation of the legal value of an image
Legal boundaries do not always fit the visible boundaries
Technical constraints
Location accuracy
Image quality
It can provide a valuable help
To save and share the information more securely
To replace traditional delineation in specific situations :- when the boundary position is not accessible- when the boundary is curvilinear or « fractal »
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 15
2. Public communicationCommunication grand public
An ortho-image is much more friendly than a mapThe information is not « filtered »The cost per km2 is lower
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 16
Conclusion
Beijing declaration (2008) :We, members of the International Society forPhotogrammetry and Remote Sensing (ISPRS) andparticipants of the XXIst ISPRS Congress in Beijing,recognise the importance of imagery to measure andmonitor the natural and man-made features on planet Earthand to explore othr planets of the solar system, especiallyafter witnessing the important role of photogrammetry,remote sensing and spatial information systems in therescue operation and damage assessment of the recentdevastating natural disasters.
Sydney declaration (2010) :We, members of FIG and participants of the FIG XXIVInternational Congress in Sydney, 11-16 April 2010,recognise the importance of good land information and goodland governance in support of the global agenda such as theMillenium Development Goals, and as a basis for meetingthe key challenges of the 21st centurysuch as climatechange, natural disasters, environmental degradations,rapid urban growth, and poverty eradication.