The criterion of multiplicity in the cadastre is very questionable, the reason is not its usefulness but also the sustainability of the data. If we did an extreme exercise (As well as the capon cock :)), it could be that "all" data is useful sooner or later, but for practical purposes, many of those data are a weight to sustainability, in the medium term it would be ruled out its capture or update. When someone wants to do a cadastre "Multipurpose", You should ask yourself things like:
Who will consult the data?
What level of accuracy is expected?
Who will update the data?
How often will it be updated?
It is possible to identify that not all the data of the cadastral file are "necessary" in the immediate one, but some of general use that "others" (not the cadastre) could consult but never update. We could call these data multipurpose general purpose. There are also data that the cadastre could not update, not because it can not but because they become unsustainable or there is another institution with better conditions (or interests), although these data are necessary, since their updating does not depend on the cadastre, they must considered secondary or of specific use. To the extent that "unnecessary" data is minimized and one of the principles that the INSPIRE initiative has recovered is followed, which says that the information must be captured only once in the field, the data management will be more sustainable.
An interesting way to separate the data is based on its relationship with the institutions involved, such as the Municipal Cadastre Department, the National Cadastre, the Land Registry, Planning Offices, etc. Much of this changes according to the legislation of each country, but it is important to remember that the cadastre registers "the facts" and any aspect that is not "done" could be the responsibility of another instance, also to separate the data that is captured in field, and those that will be of later process.
Lemmen separates information, from the three main figures of the Cadastre: Subject, Subject and Law. For educational purposes we have called Affections and Transactions To relationship figures, (usually composed of data obtained by post-capture analysis) so that the exercise is also easy to remember:
DErecho (The relation between the subject and the object)
AFectations (Relations between object and law)
TRansactions (Relations between subject and law)
OBjeto (The property)
S(Individuals, natural or legal)
Purpose, this is the representation of the recordable reality at the level of maps or documents. Here they appear:
- The plot, which may well be sub-plot, multiple plot, registered plot and service plot (shared in condominium) but which as a rule has a geometry linked to data. Accuracy is a question of the relevance of the cadastre and long-term vision.
- The building, which may include construction, fixed installations, improvements and even non-geo-referenced assets. In the rural case, it will also be permanent improvements such as crops.
- Also at this level the goods may be in the status of a non-georeferenced document (such as a sworn statement), as a point (such as the punctual cadastre or plot text), such as spaghetti (such as CAD maps without geodatabase integration).
Subject, This is the representation of people, and can be natural, not natural (as legal) people and may also have groupings.
Law, this is the relationship between people (subjects) and goods (objects). Here may be included not only the legally registered real rights but also those in fact, but that reflect a link of possession, possession or right of transfer.
Concerns, are actions that affect attributive or restrictive the right to use, domain, habitation, usufruct or transfer of the object. It is quite similar to the law, but it is an extension of this that the registration systems end up giving many names (as a marginal note) because they are not their competence, or at least not Its accuracy. This can be a documentary reference, but in general they start from a spatial coincidence that affects the plot, either by public or private law; for example:
- A high voltage line, which restricts the use or room, but not the domain
- An underground train, which passes under many buildings, also applied to the 3D cadastre, when a property is on a public highway.
- A ditch control system, which restricts underground use for water extraction purposes.
- An area subject to flood, a protected area, an easement of passage etc.
Generally affectations are transient or may change over time its effect; for example:
A parcel may be within an ejidal legal nature; For purposes of titling, the ejido defines who issues the certificate of ownership, but once registered can be treated as private despite being within an ejidal nature. It did not change the region of affectation but the effect.
Also affectations do not oblige to make partitions ex officio, if it is not necessary; for example:
A parcel may be partially affected by an urban boundary, which restricts its partial use, but does not require segregation; Unless the urban boundary affects who should title it inside or outside.
And also affectations are "facts" as long as they are not within a special mandatory regime; for example:
A parcel that is partially within a road easement or protected area. The cadastre says "it is like this", but it is pertinent for another institution to decide the action for regularization purposes.
Transactions, are actions performed on the acquired right. This can be: the measurement, construction, update, transfer or appraisal.
The transactions must be captured and updated by the corresponding entities by law. To put a
The valuation It is not a fact, but a transaction on a property, which is done at a certain time, with a method and which will be valid until there is an update of that appraisal. But it is not pertinence of the cadastre (as a general fact) the appraisal, but a transaction for commercial or tax purposes. It means, that it is a data, of fiscal use or for studies of surplus value; its updating should be the responsibility of another department, even with consignment to the cadastre.
To partially close the issue on which we will return later, we can define that the "multipurpose general purpose" data should be reduced to the minimum under the jurisdiction of the cadastre, and should be sought to be separated from the "multipurpose of specific use". As long as the minimum requirements of the Basic approaches Of the cadastre: Fiscal, socioeconomic, legal and land use.