Acquisition and present situation of traditional geographic information

The data sources of GIS are: map data, remote sensing data, text data, statistical data, measured data, multimedia data and existing system data. (1) Spatial data: field data collection and map digitization. For large-scale urban geographic information system, field data collection may be a major means. The methods of field data collection include flat panel survey, total station survey and GPS survey. In addition, map digitization is still the main means to obtain data in GIS. There are two working modes of map digitization: digital instrument manual tracking digitization and map scanning digitization. (2) Attribute data: generally, it is character strings and numbers, which are generally input through the keyboard, and its acquisition mainly lies in data collection.

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