MAPX secondary development with VC ------ Geographic Information System Overview Writer: Bluedy Er- Huang@163.com1.1 Geographical Information System Concept Geographic Information System (GIS, is a kind Decision Support Systems. The so-called decision support system is a system that can get information from the management information system to help managers to develop decisions. As can be seen from the name of the Geographic Information System, the geographic information system can be divided into two parts, namely "geography" and "information". "Geography" represents spatial information, "information" represents attribute information, both through geocoding, forms a complete system. For example, in MapInfo, "Geographic" data is stored in the map file, "information", that is, attribute data stores in the Tab and DAT files, "Geographic" data and "information" data are connected by ID file (geocoding). Understand the concept of these two, is very beneficial to the application of GIS.
1.2 The composition of the geographic information system consists of hardware: as for hardware, a microcomputer peripheral. The configuration of the microcomputer depends on the specific system, but for mapinfo, the requirements are very low, as long as you run Windows98, it is not very slow. Peripheral is a bottomless hole, what digitalizer, analytical instrument, scanner, engineering printer, mapping instrument, aerial inspection instrument ... too much, depending on the situation. Of course, the general peripheral of the microcomputer is affirmative (keyboard mouse, etc.). Software composition: That depends on what GIS platform, we conduct MapX secondary development, of course Mapx, the compiler is VC 5.0 or more, the operating system is a Windows series (of course, Windows95 or more).
1.3 The function of the geographic information system is for the function of GIS. Do you want to listen to the function of academic? Still want to hear the function of the people, the function of academic saying, it is too much, simply putting GIS to the world. , Everything, omnipotent, you go to find relevant information. Let us listen to the features of the people ------ draw a map, write a few words, change it. Oh, is the sacred GIS look like this? "The eyes of the masses are bright", almost. The function of GIS is first showing a geographic location (drawing a map): many of our information is related to location, application is also very broad, such as where your home lives, where is there, where is the vehicle, mobile base station Where is the right, these can be easily manifested with a map. The function of the GIS is the second information related to the location (written a few words): For example, how much is your home area, how to build, what is the building materials, there are several layers, these can be recorded by the property of the land. . Another feature of GIS is also a very important feature: analysis and modeling. The resulting spatial information and attribute information are analyzed to obtain some new information to meet people's needs. Or establish a mathematical model to simulate the things in reality.
