Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

1

Conception and multi-sources enrichment of significant features for

a multi-purpose cadastre

UMR ESPACE 6012 - Montpellier - France & CIRAD-TERA

• Jean-Paul CHEYLAN (Dr)

• David LEVREL (Doctoral student)

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

2

Cadastre and multi-purpose cadastre, a set of products

It ’s appear that cadastral map is useful in different ways, for different purposes leading to very different needs and specifications (Dale:http://sunspot.sli.unimelb.edu.au/research/cad_anthology/article/artic2.htm)

Asset managementconveyancingcredit securitydemographic analysisenvironmental impact assessment

Land and property ownershipland reforme, physical planningpublic communicationssite locationland market analysisetc...

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

3

Urban planningand management

Natural spacemanagement

Agriculturalspace

management

Geographicspace

Urban growthdiagnostic and

monitoring

Precision andhigh qualityagriculture

LeisureBiological diversity

Pastoralism

The main thematic and space division

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

4

• Multi-sources based(Cadastre, GPS measures, aerial photography, ortho photography,

remote sensing imagery, thematic maps data sets…)

different needs, different and overlapping specifications

• A family of products

Adapted to different uses overlaying

in space, time and content• The conception must be

context dependent in

Urban Agricultural Natural

space

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

5

• Common reconception criteria

Semantical, physionomical, functional, protocol based

• Main features specification

spatial extentconsistence of features semantic as protocol productborders ‘bodies’

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

6

Agricultural space

Cadastral parcels delineate most of the significant cultural parcels

Relationship : cadastral parcels - cultural (physionomical)Ownership VS use management

Borders ‘thickness’ Status, structure, content

As boundaries accuracy indicator

Morphological significanceShape, area, …division history

Functional significance ditch, trench, drainage structures, bank and ramp, cultural service tracks.

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

7

Infra-red colored image

shot date :

24/08/92

scale : 1/17 000

spatial resolution :

50 cm

Urban space

Agricultural space

Natural space

North

0 500 m

Lauret

Claret

Agricultural spaceOur study area : Lauret district

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

8

Cadastral layer

cadastralparcel 1

0 170 m0 170 m0 170 m

This physical border does not have any legal existence

0 170 m

vineyard

Annual crop

Agricultural spacecase 1 : the image enrich the cadastral plan

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

9

Cadastral layer

0 170 m

Cadastral parcel 2

0 170 m

This cadastral parcel edge does not have any physical reality

Agricultural spacecase 2 : the cadastral plan enrich the image

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

10

Cadastral layer

0 170 m

Cadastral parcel 3

0 170 m

Agricultural spacecase 3 : significant inscription of cadastral

parcels in the image

This set of cadastral parcels fit with cultural parcel set

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

11

Infrared colored image

shot date : 24/08/92

spatial resolution : 24 cm

Cultural service track

bank

ditch

Structure and content of border thicknessDiscrimation of significant technical features with

aerial phography

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

12

Built-up, urban, future urban spaces

Most of the borders are significantsome borders don’t have physionomical inscriptionsome observable border don’t have cadastral

counterpart

Recognise and delineate significant land cover parcels(built up area, urban vegetation spaces, body of the circulation infrastructures)

as planning features.

- Recognise different meaning of ‘parcel’ links between elementary spatial objects(buildings, open private spaces, open public spaces, yards, etc.)

- Recognise significant buildings (using inaccurate resolution) their complex relations to cadastral parcels(multi-parcels building, multi-buildings parcels)

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

13

Body of traffic infrastructures"Street bodies" : Public, non cadastral space

Streetbody

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

14

Body of traffic infrastructures"Street bodies" : Public management

Publicmanagement

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

15

Body of traffic infrastructures"Street bodies" : Functional bodies

Functionalbodies

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

16

Urban vegetation delineation

Urbanvegetation

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

17

“Natural” space(space of the spontaneous vegetation dynamics)

Cadastral parcels have few significant inscription

Cadastral parcels are used as locational source

in conjunction with aerial photographs

- able to give some part of significant features

forestery tracks(with partial cadastral concordance)

- able to give physionomical bodies hypothesis

formers land cover history

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

18

Old forest cut

Cadastral parcel

Forestery tracks

"Natural space"(Space of the spontaneous vegetation dynamics)

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

19

Quality derivation

The spatial accuracy needs:preliminary ..and unsatisfied condition !

from centimetre (facilities management)to decimetre (agricultural space)to metre and Dm. (natural space)

Availability (in France)In 70% of the spacecm. Orthophoto Not available, special orderdm. Orthophoto Not available, special precessingDm. Orthophoto Not available, special precessing2-4 Dm. Orthoimage Available

Is a progressive accuracy refinement tractable?

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

20

Perspectives

Revisions, derivation and enrichments

Revision Choice between borders perception Spatially non-monotone: i.e.

• in agricultural space, generally ditch or banks denote a cadastral boundary

• in natural space textural strong edges could inform about former valorisation of the space

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

21

Derivation

i.e. finding different parts of an urban parcel :

• compactness index• combination of adjacent elementary• objects approximating the known total area

Data fusion and separation meeting - Carnuntum, Austria, 24-26 June 2001

22

Enrichment

Enrichment of the attribute lancover, landuse,drainage and irrigation networks

Graphical and geog. side (positionning, spatial accuracy Consistency and coherence problems

Some inconsistent situations are legal

Non-destructive enrichmentseems to be more appropriated