General information

The geo database ArcSDE has a certain structure. Spatial data are located in the database tables. Each table is designed to store certain types of objects. Tables are logically combined into layers. Joining tables in layers in the notification ArcGIS is called a relationship «domain-subdomain».

The composition for the fields of the tables is different – depending on the attributes for the type of objects for which the table is intended to be stored. However, each table has a minimum set of fields common to all tables:

-  OBJECTID – integer unique record identifier;

-  SHAPE – the spatial description of the object;

-  MADOITUONG – classification code of the object (code of the conventional sign (symbol)).

In addition to these fields, there may be other fields common to all tables (for example, MANHANDANG, TENMANH, SOPHIENHIEUMANHBANDO and others). But for the processes of importing and exporting data, the presence of the specified fields – OBJECTID, SHAPE and MADOITUONG – is of fundamental importance.

One entry in the geo database table is one object on the map.