The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XLII-4/W15, 2019
14th 3D GeoInfo Conference, 24–27 September 2019, Singapore
CONSIDERATIONS FOR A CONTEMPORARY 3D CADASTRE FOR OUR TIMES
Jantien Stoter 1, Serene Ho 2, Filip Biljecki 3
1
3D Geoinformation, Delft University of Technology, Delft, Netherlands – j.e.stoter@tudelft.nl
2
School of Science, RMIT University, Melbourne, VIC, Australia – serene.ho2@rmit.edu.au
3
School of Design and Environment, National University of Singapore, Singapore – filip@nus.edu.sg
KEY WORDS: 3D Cadastre, 3D Land Administration, The Netherlands, Singapore, Victoria (Australia)
ABSTRACT:
A significant number of studies has been carried out to establish 3D cadastre solutions to improve the registration of multi-level
property. Since the inception of research on 3D cadastres (about 20 years ago), the world around us has changed significantly and this
also partly changes the context regarding 3D cadastre: technology (e.g. visualisation of 3D information), acquisition techniques and
BIM data availability, and policy and organisational structures. This paper aims to explore the implications of these changes on 3D
cadastre research with a view to discussing considerations for a contemporary 3D cadastre for our times. The paper draws on social
and technical trends, challenges, and gaps around 3D cadastre practices from three jurisdictions: the Australian state of Victoria, the
Netherlands, and Singapore. The cases have been selected as examples of well-functioning and highly trusted cadastres and land
registries committed to innovation in this area, and whose practitioners and researchers are leading the research in this domain. This
set provides a breadth of insight that informs our discussion. However, we acknowledge the limitations of the findings as the research
undertaken in these jurisdictions is not complicated by other issues with registration or cadastres as they may occur in other countries.
1. INTRODUCTION
Increasing structural complexity and a growing trend towards
using high-rise buildings for residential or mixed-use purposes
has impacted on the design and layout of private and common
property RRRs. Bugden (2005) paints a scenario, which although
located in Sydney, is likely to mirror development in any number
of cities around the world:
“This project (King Street Wharf at Darling Harbour in
Sydney) is a mixed use staged development comprising
nine tower buildings, the majority of which are built over
a common basement that houses shared parking, facilities
and equipment. Most, but not all the tower buildings are
strata subdivided and most, but not all, are under
leasehold strata title. One large building is under
freehold strata title. Part of the Sydney public road
network passes over the basements and a bus interchange
facility and large commercial marina facility interfaces
with the complex. The uses comprise retail, commercial
offices, serviced apartments, residential apartments,
restaurants, entertainment venues and charter boat
operations” (p. 5).
These are the types of complex high-rise structures that are the
mainstream model in urban environments – and set to become
ever more complex.
Up till today, in most jurisdictions, a 2D parcel is the main entity
of property registration. To be able to establish the legal status of
multi-level (i.e. 3D) property rights, limited real rights are
established on the concerning land parcels, such as easement,
right of superficies and right of ground lease. Although instances
of such legislation appear to exist from as early as 200 years ago
(a condominium law was passed in 1804 in France) (Le Goix &
Webster, 2008), modern legislation in this area is attributed to the
Australian model of strata titling, introduced in the 1960s
(Christudason, 1996). In addition, the increasing use of strata
titling in more developed countries, like Australia, has been
driven by a dominant culture of owner occupancy (National
Housing Supply Council 2008). Likewise, in The Netherlands
multi-level property have been in existence since long before the
start of the Dutch cadastre (1832). Historical examples are cellars
under the public street leading from canals to houses in the city
of Utrecht. As in many countries, these multi-level property
situations are established via limited rights on 2D parcels.
The range of public, private and common property RRRs
associated with modern high-rise buildings represent an
increasingly complex information challenge for the urban land
development process in terms of conceptualising, planning,
building and registering, with consequences for its ongoing
management. As shown in many studies, while this way of
registration absolutely meets regulatory prescriptions, it does not
always provide proper insight into the legal situation and instead
relies on relative expertise within cadastral and land registration
organizations to interpret these scenarios and provide
information to public stakeholders. This is often not a problem at
the moment the legal situation is created as there are multiple
checks via regulatory planning, subdivision and registration
processes. In fact, the system more likely than not incentives
agreement, collaboration and problem resolution amongst
stakeholders, e.g. through mandated processing timelines. At that
moment, all stakeholders have to agree on the registration and
therefore, for them, the legal situation – as represented on the
plan – is clear. The main challenges arise in future transactions.
This can be the transfer of multi-level property rights when the
involved parties (buyer, seller, and others, such as a mortgage
bank) need to reconstruct the existing 3D property situation (and
its associated rights) from both the 2D cadastral map and the
deeds or titles registered in the land register. But there are also
significant challenges arising from the ongoing management of a
building that requires a clear overview of the division of the
building, which cannot always be provided by a parcel-based
registration. In conclusion, many jurisdictions provide a way to
register the legal status of multi-level property situations, but
solutions to provide information in an unambiguous manner, also
for future queries, hardly exist.
There are several hurdles that make it hard for cadastres to move
forward towards real 3D registrations - here we speak of
registrations using 3D digital data. Firstly, cadastral
organizations cannot make the move themselves, since the nature
of their task is reactive rather than proactive. For example, in the
Netherlands the Kadaster must register any registration prepared
by notaries that they submit for registration as long as it fulfils
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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XLII-4/W15, 2019
14th 3D GeoInfo Conference, 24–27 September 2019, Singapore
the registration requirements. Therefore, as long as it is not
legally enforced, Kadaster cannot require 3D registration even if
it would improve the clarity of the registration. This would
arguably be the case for many other countries contemplating this
issue. Consequently, the development towards 3D cadastre needs
involvement and agreement of stakeholders.
A second hurdle for progress in 3D cadastre is that costs are
easier to identify than the benefits, especially in terms of
costs/benefits accruing to land registries. So there will never be a
closed business case for shifting to wholly digital 3D cadastre
registration, i.e. it is difficult express the value of better
represented legal property situations when so much of the benefit
is in generating public value downstream and therefore not
directly accruable to land registries (Ho et al., 2018).
Thirdly, it is often assumed that progress will be pushed by
technical developments and most studies on 3D cadastres show
the technical possibilities of a 3D cadastre for which the legal
impact is often still unclear. Therefore, 3D cadastre solutions
require simultaneous investigation of both legal and technical
aspects. The legal mandate of cadastres and land registers is to
record and register ownership boundaries and hold information
on these, which is not easy to translate one-to-one into technical
solutions and is challenging with the uncertainties involved. The
cadastres and land registers usually do not operate in such unclear
situations, especially in jurisdictions where the state provides a
guarantee of title. Therefore, remaining at a stage in which
procedures are certain and legally solid is more appealing and
risk-averse.
A significant number of studies have been carried out to establish
3D cadastre solutions to improve the registration of multi-level
property for example, in the case of a tunnel or an underground
parking garage. The research and need for 3D cadastres have
mainly been studied within traditional tasks of cadastres and land
registers, i.e. securing rights, restrictions and responsibilities
(RRRs) by maintaining information on these RRRs established
on land and providing clear information whenever needed. With
drivers such as open public sector information and greater
transparency in government dealings, there is now a need to
consider how cadastral data can be used to meet broader public
interests that go beyond the statutory and legal mandate of these
organizations. This makes it necessary and relevant to consider
the future of 3D cadastres in a wider context.
In this paper we investigate three jurisdictions - the Australian
state of Victoria, the Netherlands, and Singapore (respectively
Sections 2, 3 and 4) - to identify trends (social and technical),
challenges and gaps around 3D cadastre practices (Section 5)
with a view to discussing considerations for a contemporary 3D
cadastre (Section 6). The cases have been selected as examples
of well-functioning and highly trusted cadastres and land
registries committed to innovation in this area, and whose
practitioners and researchers are leading the research in this
domain. This set of cases provides a breadth of insight that
informs our discussion. However, we acknowledge the
limitations of the findings as the research undertaken in these
jurisdictions is not complicated by other fundamental
institutional issues that tend to be associated with registration or
cadastres - as is the case in many other countries.
2. 3D CADASTRE IN VICTORIA, AUSTRALIA
2.1 Current Status of 3D Cadastre
Since strata titling was introduced in the 1960s, 3D land and
property rights (3D RRRs) (both freehold, e.g. apartments,
carparks, etc., and non-freehold, e.g. infrastructure) have always
been successfully registered in Australia with 3D cadastral spatial
data represented using paper-based plans (with cross sections and
enlargements used to clarify the situation) and held in a 2D
spatial information environment. Australia employs the Torrens
titling system, the success of which is underpinned by the
maintenance of an accurate and up-to-date cadastre.
Echoing trends around the world, there has been a growing push
to develop a 3D digital cadastre in Australia since the early
2000s, with high level national support being made explicit in the
‘Cadastre 2034’ strategy document published by the
Intergovernmental Committee on Surveying and Mapping
(ICSM, 2015). The strategy identifies its vision for a
contemporary – and future-proof – cadastre predicated on the
following goals (p. 6):
•
fundamental to land and property ownership and is
sustainably managed
•
truly accessible, easily visualized, and readily understood
and used
•
fully integrated with broader legal and social interests on
land
•
provides a digital representation of the real world that is
survey accurate, 3-dimensional and dynamic
•
is a federated cadastral system based on common
standards.
At a state level, the push for 3D innovation in Victoria rests on
two main arguments. The first argument is efficiency, recognizing
that digital survey data conveys many benefits around validation,
analysis, sharing and reuse of data within the land development
process (Aien, Rajabifard, Kalantari, & Wiliamson, 2011).
Survey data is also used to construct the state’s property map
(otherwise known as the digital cadastral database (DCDB)), a
tool that provides the public with an entry point to querying
property information in detail, and a lack of digital data impedes
the ability to update the map automatically (Olfat, Shojaei, &
Briffa, 2016). Another argument for 3D innovation is
effectiveness, since the representation of 3D ownership spaces
(e.g. in large apartment blocks) are notoriously difficult to
visualize and comprehend (Rajabifard et al., 2014).
Recent state government policies such as the Victorian Digital
Asset Strategy (VDAS) are also driving whole-of-government
innovation that assumes 3D information and information
technologies (e.g. Building Information Models) as mainstream,
serving to provide platforms to realize connected information
environments for asset management (Office of Projects Victoria,
2019).
Efforts to realise a 3D digital cadastre in Victoria are interlinked
with a larger initiative to transition cadastral data from paperbased to digital formats. The main platform for doing this is the
ePlan initiative. This is an electronic cadastral survey plan
lodgement and validation system based on the use of a digital
data file containing surveying and administrative information
related to a land subdivision (building subdivisions are not
currently supported) (DELWP, 2018). Therefore, Victoria’s
vision to realize a 3D digital cadastre requires providing the
necessary ePlan infrastructure in the short term and implementing
ePlan for all Victorian cadastral plans and surveys by 2025,
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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XLII-4/W15, 2019
14th 3D GeoInfo Conference, 24–27 September 2019, Singapore
including building subdivisions (Olfat, Shojaei, Briffa, Maley, &
Rajabifard, 2018). A recent assessment by Shojaei, Olfat,
Rajabifard, Darvill, & Briffa (2016) of the ePlan protocol (a
digital data file related to subdivisions that contain surveying and
administrative information) indicated that while 3D RRRs could
broadly be supported by using a referencing approach, it
currently resulted in a high level of manual intervention. The
authors argue several issues still need to be resolved:
•
Data workflow issues: since dimensions of 3D RRRs are
not typically included in building subdivisions, the current
workflow needs to change to require architects to submit
the requisite information to create the 3D objects.
Subsequently, further steps are required (and corollary data
formats) to convert the architectural information into a
valid ePlan file.
•
CAD software limitations: current available software for
CAD drafting is not designed for cadastral purposes and is
limited in their ability to define cadastral spatial units, e.g.
common properties, unbounded objects and intersecting
RRRs.
•
Geometric modelling limitations: unbounded objects and
curved objects are still not handled adequately, if at all.
2.2 Lessons learned and questions for further research
Over the last ten years, the state’s key land administration
agency, Land Use Victoria (LUV), has been actively targeting
research and development. This has been both within the agency,
and in collaboration with academia, mainly focused on technical
aspects such as data modelling (Aien, Kalantari, Rajabifard,
Williamson, & Wallace, 2013; Atazadeh, Kalantari, Rajabifard,
Ho, & Ngo, 2017), visualisation (Shojaei, Rajabifard, Kalantari,
Bishop, & Aien, 2014), data sourcing (Jazayeri, Rajabifard, &
Kalantari, 2014) and more recently, validation of geometric
cadastral data (Shojaei et al., 2017). To date, these efforts have
mostly focused on adapting the Industry Foundation Class used
in Building Information Models to model building subdivisions,
since in Victoria, legal spaces in buildings are defined by their
physical structures (walls, floors, ceilings, etc.) to offer better
potential with integrating with broader 3D data innovations in the
architectural, engineering and construction industries critical to
land development.
While technical issues still remain despite numerous studies,
non-technical issues have received less attention (Ho &
Rajabifard, 2016; Ho, Rajabifard, & Kalantari, 2015). However,
as technical knowledge has advanced, it has led to an emergence
and/or clarification of a range of legal and institutional issues, as
well as raising new questions. Some of the more salient issues are
outlined below.
•
Dealing with easements, especially as part of common
property. Legislation in Victoria enables certain easements
to be created without definition of spatial extent and
location. There are two ways this can be done: as implied
easements, where their location and function are not
specified on the plan of subdivision; or as prescriptive
easements (though rarely used nowadays), acquired
through long use (State Government of Victoria, 2018,
2019). In buildings, implied easements are commonly used
to describe 3D RRRs over passage or provision of utilities
and services (e.g. water, gas, electricity, data, etc.) and
rights of way which typically fall within common property
(although other functions are also described in section
12(2)(b) of the Subdivision Act 1988). Implied easements
save time and energy in terms of onerous drafting, but the
discoverability of such easements (and their RRRs) are
•
•
•
only through textual annotations on plan, which can be
difficult to interpret.
Legal framework to ensure 3D data produced as part of the
land development process can be used for 3D modelling of
cadastral objects and RRRs. If current registration
processes do not demand building dimensions, how can 3D
geometries be derived as part of the land development
process? Would this require amendments to planning,
subdivision or registration regulations?
The authoritativeness of 3D models (Shojaei, Olfat,
Rajabifard, Darvill, & Briffa, 2016). Currently, the 2D plan
of subdivision is the document with legal status and digital
representations of RRRs, e.g. in the property map (DCDB),
while based on the plan, has no legal status. Should 3D
models be used for registration purposes (i.e. the model is
a legal object) or simply be considered in the same vein as
the property map, i.e. serving public value purposes?
Lack of a coherent strategy around innovation and change
– are land registries leaders or followers? There are now
broader multi-industry changes driving developments in
3D and virtual environments such as ‘digital twins’. In
Victoria, a voluntary working group around digital built
environments was established last year to align interests
and innovation efforts across a range of industries
including law, information technology, and built
environment. However, there is no clear indication as yet
as to how the land registry might interact with this
grassroots initiative.
Despite the significant knowledge developed and lessons, and
pilots and prototypes that show how 3D RRRs can be described
and visualized (based on IFC), there is still no practical example
of a 3D registration conducted using digital data in Victoria.
Given that the system is essentially perceived as not being
‘broken’, it is questionable as to how likely this will occur
anytime soon.
3. DESCRIPTION OF 3D CADASTRE IN NL
3.1 Current status of 3D cadastre
After 15 years of research on 3D cadastre in the Netherlands (e.g.
Stoter and Ploeger, 2003; Stoter and Salzmann, 2003; Stoter et
al., 2013), the Dutch cadastre, land registry and mapping agency
– in short Kadaster – registered a first 3D registration in the land
registration in 2016 (Stoter et al., 2016; Stoter et al., 2017). Until
then different studies and pilots have been carried out and one of
the main challenges identified was (and still is) getting legal,
organizational and technical experts to agree on a common view
on a 3D cadastral solution. The solution of a real 3D cadastre
registration was therefore sought within the current cadastral,
organizational, and technical frameworks to obtain knowledge
and insights on the optimal way of implementing 3D registration.
The obtained knowledge and experience could help further
developing the 3D registration in the Netherlands.
The 3D registration as legal deed in the 3D PDF format became
possible, in 2007, when electronic deeds in PDF format were
accepted as legal documents (Kadaster, 2007). The 3D
registration, realized in 2016, works as follows: limited rights are
established on 2D parcels to establish the legal status of the multilevel properties, as used to be done in the past for the registration
of multi-level property. However, the 3D cadastral registration is
different from traditional registrations of multi-level properties.
In the former, parcels need to be divided into smaller parcels in
order to reflect the projected multi-level property on the 2D
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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XLII-4/W15, 2019
14th 3D GeoInfo Conference, 24–27 September 2019, Singapore
cadastral map. But in the 3D registration, the 3D ‘complex’ can
be registered on one ground parcel and refers to a 3D document
that shows how the different properties relate to each other in
vertical and horizontal dimensions. Therefore, a further division
of ground parcels is no longer necessary. The document that is
registered as deed in the land registers, is a 3D pdf that provides
the functionality to interactively query a 3D visualization
containing 3D representations of the 3D property units (Figure
1).
Figure 1: 3D PDF, official document that visualized the multilevel property rights in 3D (case Delft Station) (Stoter et al.,
2017).
Other characteristics of the 3D registration are:
•
A 3D complex consists of several 3D property units that
can have been established by different limited real rights as
chosen by the notary and involved stakeholders, i.e. right
of superficies, easements, etc.
•
A 3D complex gets an own ID. A link between the cadastral
map and the 3D complex is established.
•
Per 3D complex, there is one deed that establishes the
complex as a whole
•
To manage future situations, the 3D complex should
contain only 3D property units that have some kind of a
relationship with each other. If one of the properties
involved will be changed in the future, the owners of the
other property units of the 3D complex will be involved as
well. If these properties are not relevant for such changes,
then the 3D complex need to be further divided into more
than one 3D complex.
•
To manage rights of owners that depend on each other, the
underlying ground parcel is part of the 3D complex. This is
for example for access and construction stability purposes;
but also civil code still defines property in relation to land.
3.2 Lessons learned and questions for further research
The 3D registration provides the possibility to make clear in a
simple manner how the different properties in the vertical and
horizontal dimensions relate to each other. This is a fundamental
improvement compared to the 2D based registrations and can be
a first step towards more fundamental 3D cadastre solutions (in
which for example also 3D property boundaries are maintained).
Alternatively, 3D insight has to be reconstructed via (many)
cross-sections and verbal descriptions.
From the experiences with the first 3D cadastral registration in
reality and its stakeholders, there are some other lessons learned
(see also Stoter et al., 2017).
First, users are not per se interested in an interactive viewing
environment as often is assumed in technical studies on 3D
cadastre. Especially, non-expert users may be better served by
simplified versions of the 3D PDF, for example by preparing
(2D) visualizations from several perspectives, in which property
units are alternately made invisible (the 3D data can still be the
best base for such view). Also, an exploded view of the multilevel property situations supports the understanding of the
situation, specifically if properties are occluded from a certain
perspective. Exploded views are used in graphical visualizations
applications to show the relation or order of assembly if various
parts, see Figure 2.
Figure 2: Exploded view to clarify 3D property situation (Stoter
et al., 2017).
Another lesson learned is that stakeholders, and specifically
stakeholders from the legal domain, are not interested in accurate
3D drawings from which measurements can be made since this
is a source of uncertainty and therefore possible disputes.
A question that arose, similar to the 3D cadastre discussion in
Victoria, is about the authoritativeness of 3D models. In the
Netherlands, technical studies often assume that there is a need
to register multi-level properties with accurate 3D data. However,
notaries are even reluctant to register the situation with an
accurate 3D visualisation if the visualization gets a legal status
over the 2D description. They rather see the visualization as mean
to clarify the situation additionally to the verbal descriptions. In
that sense, the 3D visualization can easily identify spaces that
would otherwise be ignored, i.e. it enforces the assignment of
ownership to every space. Our experiences indeed showed that
specific spaces may be easily overlooked in the 2D+ cross
sections approach.
Another issue that relates to the authoritativeness of 3D models
is related to BIM models that will often be used as a source to
derive legal boundaries from. The link to BIM and how it can
provide information to represent legal spaces in a building
complex has often been studied, see for example Atazadeh et al
(2017) and Oldfield et al (2017). However, from our experience,
we observed that a juridical expert should always be involved in
identifying the legal spaces. While the CAD technician or
architect/designer can offer the source data for the 3D
visualization of legal spaces, the legal boundaries need to be
derived from these physical boundaries in close interaction with
the juridical expert who has the knowledge how to transfer
physical boundaries into legal boundaries. It should be noted that
in the Netherlands, physical boundaries do not need to coincide
with the legal boundaries, e.g. when the legal boundary is the
centre of a wall.
In addition, Kadaster needs to request additional information to
validate the legal volumes, for example, visualizations that show
that the physical objects are consistent with the legal volumes and
how these (spatially) relate to each other. This is related to the
data workflow issues mentioned in Victoria (i.e. that the current
workflow needs to change to require architects to submit the
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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XLII-4/W15, 2019
14th 3D GeoInfo Conference, 24–27 September 2019, Singapore
requisite information (i.e. 3D dimension) to transfer the 3D
objects into a valid ePlan file).
Another issue is related to the lack of a coherent strategy around
innovation and change as observed in Victoria – are land
registries leaders or followers? In the Netherlands, the notaries
are the ones who have to prepare the 3D visualization. After a
few years of informing them about the possibility of a 3D
registration, we still observe that notaries are reluctant to take the
initiative for a 3D visualization. Therefore, the Kadaster has to
organize some sort of support to reduce or remove hurdles to
realize future-proof registrations in multi-level property
situations, or indeed additional regulations are needed to enforce
such a registration in case of multi-level property.
Consequently, for situations that clearly benefit from a 3D
registration as described above, we will formulate guidelines and
rules to increase awareness on the specific situations that would
benefit from a 3D registration including the process and
workflow to realize such registrations. This is to ease the work
needed to prepare the 3D drawing. Registration of multi-level
property is increasingly part of other processes and therefore the
Dutch Kadaster studies 3D cadastre developments within other
developments, such as a 3D building registration; maintaining a
registration for 3D large -scale topography; and maintaining a
register with data on new constructions (buildings) covering
important information for (future) applications, such as
monitoring energy transition (e.g. materials used for the
building).
Another lesson learnt relates to the “speciality principle”
followed by Dutch land administration (which is also applicable
in many another countries). This principle prescribes that the
original parcel needs to be subdivided if a limited right is only
established on part of a parcel, in order to assure that parcels that
do not intersect with (the projection of) other properties are not
affected by a limited right. The costs and complexity of this
practice may be significant in cases of multi-level property rights
where boundaries are not exactly on top of each other when
projected on a 2D plane. It requires a change of the
Kadasterbesluit (Cadastre Decree) stating that surveying within
a building complex is not needed, if all rights within the complex
are represented in 3D (Stoter et al., 2017).
Finally, as in Victoria, legal rules should be formulated to
improve registration of multi-level property, since for current
multi-level property a parcel-based registration is sufficient and
there is no drive to use nowadays technologies to improve
registration of such cases. As described above, this does not give
problems at the moment the multi-level property is registered, but
it may cause problems in future transactions when the involved
parties (buyer, seller, mortgage bank) need to reconstruct the
existing 3D property situation from both the 2D cadastral map
and the deeds registered in the land register.
4. SINGAPORE
motivated and started a long time ago. These developments have
been continuously documented in the standard outlets and venues
of the international 3D cadastre community, e.g. see Khoo (2011)
and Soon et al. (2016), and this section briefly summarizes their
key points. A notable source valuable for understanding the state
of the art of (3D) cadastre in Singapore is the publicly available
result of the questionnaire of the FIG 3D Cadastres platform
(Soon, 2014; Soon, 2019), in which also the expectations for the
foreseeable future have been discussed.
At the moment no 3D parcels in Singapore are yet available, but
certain 3D information (e.g. denoting height values on 2D plans)
can be recorded. The legislation framework leading to the
establishment of 3D cadastre is being revisited, while the
technological aspect follows developments similar to other
jurisdictions, e.g. cadastral submissions are enabled in LandXML
and its elevation to 3D is being investigated (Thompson et al.,
2017; Soon, 2012).
An important recent technological development is the design of
the Cadastral Survey Management System (CSMS), a new
cadastral system which among other goals such as increasing data
interoperability and communication, is in place to foster the
adoption of 3D. In parallel to that, SG LandXML – the Singapore
profile of LandXML, which is tailored to the country’s context,
has been rolled out. Its design is based on ePlan (Soon et al.,
2016).
Registered surveyors are able to prepare their submissions in SG
LandXML. An important distinction from Australia and New
Zealand, to which Singapore’s developments have been partially
aligned to, is that the submissions are covered through various
stages of development and not only at the final stage: they include
the entire lifecycle from the moment of the inception of the
parcel. In the context of 3D, it may be relevant to note that the
extended schema of SG LandXML enables storing occupational
details and indicating their intrusion with legal boundaries (Soon
et al., 2016).
The cadastral developments in Singapore are accompanied by
other GIS and digital twinning initiatives (Soon and Khoo, 2017),
such as the Virtual Singapore (a collaborative governmental
platform including a nation-wide semantic 3D city model), and
discussions on how to integrate these developments are
undergoing.
4.2 Challenges and future developments
According to the latest version of the questionnaire on 3D
cadastres, the expectation in a few years is to have 3D parcel
representations (formats that are mentioned are 3D PDF and 3D
LandXML) and a revised legislation to enable 3D.
Currently the top priorities and challenges are the legal aspect
(revisions to support 3D cadastre are ongoing), software
development (adoption of software to support 3D is a risk), and
organizational aspect (surveyors will need to migrate their
workflows to 3D submissions) (Soon, 2019).
4.1 Current status of 3D cadastre
Cadastral developments in Singapore are largely led and
coordinated by the Singapore Land Authority (SLA), the citystate’s national mapping agency and the statutory board
responsible for recording cadastral transactions and titles
information. Given Singapore’s high population density,
complex 3D situations and architecture, large share of high-rises,
and limited land area, developments in 3D cadastre are clearly
A notable contribution in discussions related to 3D registration is
the alignment of different types of parcels (e.g. 2D lot, multivalued stepped lot) to the concept of level of detail (LoD) where
the different types of parcels are categorized according to the
geometric complexity, akin to the definition of the CityGML
LoDs (see (Soon et al., 2016) for more details). This topic is
important not only in the context of the modelling complexity,
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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XLII-4/W15, 2019
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but also the computational performance and demonstrating the
2D/3D support in SG LandXML for enabling 3D cadastre.
It is expected that future developments will be related to BIM, as
it is mandated by the government for compliance checking and
regulatory approval (Ho & Rajabifard, 2016). This fact also led
to exploring the possibility of updating the national 3D city
model from BIM data (Stouffs et al., 2018), and possibly leading
to a cohesive platform comprising 3D cadastre.
While the developments are in many ways in line with those of
other countries, there appears to be a particular focus on
underground space which in Singapore is being heavily used for
transportation, malls, utilities, and underground caverns; and
recent research developments hint at the development of a data
model for utilities (Yan et al., 2018; Yan et al., 2019).
Finally, validation of data is an important future development. At
the moment 3D parcels are not checked for spatial validity, but
there are plans to establish validation procedures.
interestingly, there is less interest in a 3D model with absolute
accuracy and more interest in one with relative accuracy as this
is sufficient for owners to understand how their property and
RRRs impact others – which meets the public interest test.
In contrast, in VIC, the focus has been on digital data which has
raised related challenges in terms of software, modelling and
validation. There has also been an emphasis on pursuing BIMbased solutions because of how the definition of legal spaces in
buildings rely on physical structures and not on dimensions
whereas this is not so much the focus in NL where legal
boundaries do not need to be related to physical structures (also
not in 2D).
Despite these differences, the three cases highlight organizational
challenges on how to institutionalize a workflow that enables 3D
data created about physical spaces to be leveraged for creating
3D data on legal spaces and to what extent legitimacy should be
ascribed to such a model, e.g. in terms of authoritativeness.
Trends
5. DISCUSSION
This paper aimed to use the experiences of three jurisdictions the Netherlands, Singapore, and the Australian state of Victoria to identify trends (social and technical), challenges and gaps
around 3D cadastre practices with a view to discussing
considerations for a contemporary 3D cadastre for our times. The
table below overviews the trends, challenges and gaps raised in
our three brief cases.
Trends. All three jurisdictions - the Netherlands (NL), Victoria
(VIC), and Singapore (SG), recognise the need for evolving
current practices in line with broader shifts in land development
and infrastructure development that is normalizing the need for
3D land and property data. This reflects a growing awareness by
land administration agencies of the increasing public benefit role
that cadastral data fulfils. The jurisdictions have been pursuing
research in this area for similar periods; however, in NL, the
Dutch Kadaster successfully undertook a 3D registration with a
legal deed represented in 3D PDF format while in VIC, despite
significant research activities and prototypes of how 3D RRRs
can be visualized, there has been no attempt made yet to
undertake a 3D registration using digital data. This could perhaps
be attributed to the Dutch pursuing an applications-based
approach (i.e. registration), while in Victoria, it has very much
been a data-driven approach.
All three jurisdictions are trying to advance the practice of 3D
cadastres and whether intentional or otherwise, the format of 3D
is demanding greater engagement with other stakeholders in the
land development process. However, this throws up the need for
regulatory revisions to ensure a structured workflow and
conformity to data standards. VIC, SG and the Dutch are all keen
to leverage BIM-based data, however in the Netherlands more
research is planned how to transfer (BIM) data about the physical
construction acquired in the design and construction phase into
(validated, as-built BIM-based) data about legal boundaries as
required in the cadastral registration.
Challenges. The three jurisdictions face similar challenges;
indeed, these are the challenges that are recurrent in the literature
as well. In NL, the application-based approach has helped to
illuminate difficulties in establishing a common view across
different stakeholder groups in what a 3D cadastre solution might
look like. There is reticence in innovation being too radical and
NL
Possible to
undertake 3D
registration as
legal deed in 3D
PDF format.
Kadaster studies
3D cadastre
developments
within other
developments as
registration of
multi-level
property is
increasingly part
of other
processes.
Challenges
Getting legal,
organisational
and technical
consensus
regarding a
common view of
a 3D cadastral
solution.
Stakeholders
(especially from
the legal
domain), are not
interested in
accurate 3D
drawings from
which
measurements
can be made.
BIM models are
a source to
derive legal
boundaries from;
but they cannot
be considered as
legal data.
Workflow to
produce 3D
VIC
High level
recognition of
the need for a
digital
representation of
the real-world
that is survey
accurate, 3D and
dynamic.
Recognition of
the public
interest role that
land registry and
cadastral data
fulfils.
Acknowledged
need for more
efficient and
effective use of
survey data.
3D RRRs can be
successfully
registered, i.e.
current system
supporting
registration of
3D RRRs not
perceived as
being ‘broken’
3D cadastre
reliant on
transitioning to
3D digital survey
data
SG
The legislative
framework is
being revisited to
support 3D.
Active
technological
developments to
support 3D
cadastre.
Focus also on
underground
utilities.
Legal aspect
should be
revised to enable
3D.
Migration from
2D to 3D in
workflows and
management of
land surveyors.
Software should
be updated to
support 3D
submissions.
Technical issues:
software,
modelling,
validation
Validation of
data is not
established.
Non-technical
issues: workflow
to produce data
for modelling 3D
RRRs, 3D RRRs
without spatial
dimensions,
authoritativeness
of model.
Integration with
other
government
initiatives in 3D
GIS and digital
twinning such as
the Virtual
Singapore.
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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XLII-4/W15, 2019
14th 3D GeoInfo Conference, 24–27 September 2019, Singapore
representation of
properties from
BIM sources: 3D
legal boundaries
needs to be
derived from
physical
boundaries in
close interaction
with the juridical
expert. Kadaster
needs to request
additional
information to
validate the legal
volumes.
Gaps
Notaries are
reluctant to take
the initiative for
3D registration.
Formulation of
legal rules to
improve
registration of
multi-level
property.
Lack of
technical
knowledge to
prepare 3D
registration by
legal experts
limits a wide
use of 3D
registration in
case of multilevel properties.
Supporting tools
and workflows
may help to take
away these
hurdles.
•
•
From this changing context for 3D cadastre as identified in the
three jurisdictions of our study, we have formulated
considerations for a contemporary 3D cadastre for our times.
Reconciling the
cost and labour
around
producing a
survey accurate
3D
representation.
No legislation
supporting 3D.
Access to 3D
information
(dissemination
aspect).
Lack of coherent
strategy to
integrate 3D
legal and
physical data.
No working
example of
registration of
3D RRRs using
digital data.
6. CONCLUSION: CONSIDERATIONS FOR A
CONTEMPORARY 3D CADASTRE FOR OUR TIMES
In this paper, we studied considerations for a contemporary 3D
cadastre for our times, based on experiences in 3 different
jurisdictions. We acknowledge the limitations of the findings as
the research undertaken in this paper only considers three
countries. However, we identified considerations common for all
three jurisdictions that need attention in the near future.
Since the start of research on 3D cadastre (about 20 years ago)
the world around us has changed significantly and this also partly
changes the context regarding 3D cadastre. These changes can be
summarized as:
•
•
•
Policy and organizational structures have been developed
that focus on public value creation.
3D information about the environment is increasingly
considered as the backbone of the so called “Smart Cities”
movement. They provide the spatial information
infrastructure for integrating data on, for instance, noise,
energy, air pollution, mobility, and temperature, and they
help practitioners make the best decisions related to
sustainable city design, management and planning. 3D
property information is one type of information within
these 3D spatial data infrastructures.
Nowadays the public use and expectations of 3D
information is bigger than the legal mandate which makes
it relevant to look at the future of 3D cadastre in a wider
context.
Technologies to collect, maintain, publish and visualise 3D
information have matured and become mainstream
With advanced 3D acquisition techniques and detailed
Building Information Models (BIM) available, the link
between 3D models of the physical world and 3D models
of legal entities has become much more apparent.
First consideration is the authoritativeness of the 3D data, for a
long time (surveyed) boundaries and deeds/titles have been used
to register parcel boundaries and multi-level property. Should 3D
models be used for registration purposes (i.e. the model is a legal
object) or simply be considered in the same vein as the property
map, i.e. serving public value purposes?
Another consideration is to translate technical developments into
legal rules in order to increase 3D registrations in practice. With
a current lack of rules, notaries (and other stakeholders involved)
seem to miss a driver (and awareness) to register multi-level
property with a 3D registration, even if it would be more efficient
and affective. This would also serve as an institutionalizing
mechanism to create new norms and routines.
Nowadays, there are broader changes driving developments in
3D and 3D property information is just one type of 3D
information. Therefore, 3D cadastres developments need a
structured approach to cross-sectoral collaboration with regards
to integrating 3D legal and physical data, particularly if the
delivery of smart cities are a key governmental objective.
Lastly, since new techniques provide new ways to provide
geospatial data for cadastral registration, the workflow to
produce 3D data for modelling 3D representations of multi-level
properties will need further considerations (beyond pilots). 3D
property information will often be produced in the design and
construction phase. This data production process from the design
to the construction phase is significantly different from the
traditional process where boundaries are surveyed; therefore
further attention on how this data can be used for 3D cadastral
registration, taking both technical and legal aspects into account,
is needed.
ACKNOWLEDGEMENTS
The author Jantien Stoter is funded by the European Research
Council under the European Union’s Horizon 2020 ERC
Agreement no. 677312 UMnD: Urban modelling in higher
dimensions.
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