VGI has not proved to be readily suitable to replace well-established accurate methods and
technologies such as those of full standard cadastral surveys. Even so, VGI potentialities as
relevant source of geospatial data have been widely acknowledged. As such, some authors
have defended that VGI may in fact play an important role such as at a local cadastral
jurisdiction level towards local spatial data infrastructures. As far as property cadastre is
concerned, the full extent 3D complexity inside a property is in many instances only known to
their occupants, thus making crowd sourcing perhaps the only economically feasible approach
for its capture. While the crowd cannot be expected to conduct a full cadastral survey, it may
be possible to ask them to indicate at least the location of complex 3D situations and thus to
facilitate local authorities’ understanding of the extent of some cadastral issues. As such, it
was argued in our previous work that geoinformation from the crowd might in fact be taken
into account as an interim step before a full surveyed 3D cadastre is eventually achieved. As
such, possible room for VGI in the context of 3D cadastre was discussed, and a hierarchical
framework of levels of data acquisition to be used at local cadastral jurisdiction level was
proposed. Such framework is revisited in this paper.Given context above, this paper focuses
primarily on two aspects. Firstly, to review technical requirements of the official cadastral
process in Portugal in order to identify which sorts of cadastral data are likely to be
acquirable/not acquirable through VGI. Secondly, to design and to implement the prototype of
a web-based application (IGV3Dcad) envisaged for general public usage to flag different land
and property ownership situations. Having information about the extent of the 2D/3D issue is
also fundamental to making a decision as to whether a 3D cadastral approach is actually
needed and hence to further invest resources in even more expensive 3D survey