C # for MAPX Two development of the MAPX basic knowledge

Main technical features of MAPX

(1) Organizing information in the form of tables (table)

Each table is a set of MapInfo files that make up the map file and the database file. To use MapInfo, you need to have user data and map files that make up the table. These files can be from MapInfo or created by the user. If a user wants to work in MapInfo, he or she must open one or more tables.

MapInfo combines data with maps in the form of tables. When a user opens a data file in MapInfo, MapInfo creates a table. This table consists of at least two separate files, one containing the data structure, and the other containing the original data. A typical MapInfo table will consist mainly of *.tab, *.dat, *.wks, *.dbf, *.xls, *.map, *.id, and *.ind file formats.

(2), drawing objects

MapInfo Built-in database management system is a relational database management system, but also the use of two-dimensional table to organize data. Unlike other relational databases, the table structure includes a graphical object column (obj column) that stores graphical objects (such as lines, regions, and so on), in addition to property columns that can contain common types. MapInfo provides an operational interface for many graphical objects that can be used to generate and process the various graphics needed.

(3), map layer

MapInfo is the organization of a computer map by layer. In other words, a computer map is processed into layers of transparent layers, which are called layers. Each layer contains a different aspect of the entire map. For example, the first layer contains the provincial boundary, the second layer represents the provincial symbol, and the third layer consists of the callout text, which is stacked to form a complete map. When you create each layer, you set up a table for it, and MapInfo is the way to make a connection between the table and the map.

That is, MapInfo is managed in the form of a table, which typically contains two parts: the map section and the database (attributes) portion.

(4), thematic map

Provide a variety of data visualization of the thematic map, the information in the database can be visualized visual analysis. When using thematic rendering to display data on a map, it is possible to clearly see patterns or trends that are difficult to find in data records and provide a basis for user decisions. Thematic maps include six forms of range value, point density, histogram, rank symbol, pie chart, and independent value.

(5), built-in ODBC

MapInfo built-in ODBC, support a variety of relational databases, support SQL queries, thus ensuring the use of the original database and access to remote databases. With the function of spatial query expansion (such as buffer, superposition, etc.), using the latest technology of Data Warehouse OLAP (online analytical Processing) on-line things processing, for applications to achieve graphical query and table query provides a powerful means.

(6), supporting a variety of data formats and their conversion

MapInfo not only supports the graphics input mode of the digitizer, but also generates the vector graph directly and supports the popular graphic image format in the current market. AutoCAD can accept DWG, DXF standard file format, but also through MIF and mid file with other software to establish data interface. The MIF file is saved with graphic information, the mid file holds the attribute information of the graphic. MIF and mid files are entered and generated through MapInfo menu commands import and Export.