Examples of Queries on Databases

A cadastral map can be organized in many ways. Check the examples below:

EXAMPLE 1

Cadastral Map with a single type of object (category) and each entity (point, line or polygon) associated to a single identifier (label/name). For instance, a Map of Farms where each polygon has a single identifier (F001/Santa Maria Farm) and its attributes (Owner: Antonio, Property value: $ 2.344.000, Area: 234 ha etc.);

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Notice that only the object Farms will be available for query, and the attributes of each polygon will be in a table associated to this object.


EXAMPLE 2

Cadastral Map with a single type of object (category) and each entity (point, line or polygon) is associated to many identifiers (labels/names) of this category. For instance, a map of urban blocks where each polygon has many identifiers, each one associated to a lot. In this case, the lots do not have graphic representation - we only know that they are inside a certain block.

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Notice that in the example above, only the object Lot will be available for query and the attributes of each polygon (block) will be in a single table associated to this object. When we click on the polygon, the system shows all identifiers associated to this polygon.


EXAMPLE 3

Cadastral Map with one or many types of object (categories) and each entity (point, line or polygon) is associated to a single identifier (label/name) of these categories. For instance, an urban Lots Map where each polygon has a single identifier for each kind of object, i.e., Hospital, Residence, Hotel etc. In this case, each lot has its own graphic representation.

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Notice that only one type of object (Hospital, Residence or Hotel) will be available for query at a time. The attributes of each polygon will only be available if the correspondent object category is selected.


EXAMPLE 4

Cadastral Map with many types of objects (categories) and each entity (point, line or polygon) is associated to one or more identifiers (label/names) of these categories. For instance, a map of urban lots where each polygon has a single identifier for an object Lot, and a group of polygons associated to another identifier of another type of object, Blocks or District. In this case, each Lot has its own graphic representation while one Block or District would be represented by several polygons.

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NOTE: Only one type of object (Lot, Block or District) will be available for query at a time, and the attributes of each polygon will only be available if the correspondent object category is selected.