Martin Salzmann Cadastre, Land Registry and Mapping Agency of the Netherlands (Kadaster) PCC Conference, Riga, May 12-13, 2015 Evolution of the Quality of the Cadastral Map in the Netherlands: Balancing User’s demands and process optimization

Cadastral surveying in the Netherlands

Process cadastral updating

Development of Cadastral map National coverage Separate sheets in local grid Driving force: cadastral working process Index map Main use:taxation purposes (growing share land market) Boundary information: field sheets

Development of Cadastral map National coverage Separate sheets in national grid Cadastral improvement is driving force: - cadmap is de facto base map (buildings included) - accuracy improvement by remeasurement (technology driven; process is too expensive) Main use: taxation, land market and general use as base map Boundary information: field sheets

Development of Cadastral map Slow introduction of (seamless) large scale topographic base map from 1974 onwards User demands driving force - Need for a nationwide seamless cadastral map - Digitization is more important than accuracy - Correspondance with base map at scale 1:1000 Main use: land market Boundary information: field sheets

Large scale base map of the Netherlands (lay-out )

Correspondance cadmap and basemap working procedure (reconcilliation) do not forget boundary maintain relationships declare identical reconcile graphically ditch road

Use of field sheets (example)

Development of Cadastral map 2005-future Large scale topographic map finalized 2000 (object based key-register from 2016 onwards) User demands, process integration, technology: - currency - consistency cadastral theme in combination with topomap and building and address registration - easier and direct access to boundary information - 3D - cables and pipelines (networks) - part of eGovernment information infrastructure Main use: land market and cornerstone eGovernment

Summary of development cadastral map Taxation Land market New technologies; process optimization De facto basemap User driven eGovernment

Feasibility study: “from good to better” increasing geometric quality and consistency “1 to 1 map” → reconstruction & viewer accurate & coordinates Field Sheets → reconstruction accurate & local relations Cadastral Map → overview and relations inaccurate & coordinates

Why do/could we need a better map? Better... Quality labels known Boundary reconstruction directly from map Consistency with topography/aerial imagery Surface determination directly from map Needed for... 3D & BIM networks Area current σ dist :20 cm possible σ dist : 5 cm 150 m 2 ± 5 m 2 ± 1 m 2

Creation of a new boundary when dividing a parcel 1832 σ = 50 cm 2015 σ = 2 cm 1976 σ = 10 cm 1910 σ = 20 cm ASSEN C How to deal with inhomogeneity? - duration of updating

3D Current solution: one object, several parcels right of superficies

Registration of networks correspondance with location of network provided by utilities?

Currency :Input of preliminary boundaries by professional users Notaries Housing societies Municipalities Professional users (intermediaries) become a professional crowd In future parties may survey themselves

Users’ participation Source: Land Information New Zealand, Cadastre users are connected users are accustomed to real-time access to information it seems obvious that they can also provide information

Concluding Remarks; balancing requirements user’s demands statutory obligations (law) technology process optimization cadastral map fit for purpose eGovernment networks 3D/BIM data integration currency public restrictions user interaction Efficiency € accuracy improvement