What Is a GIS Viewer?

GIS (geographic information system) is a discipline developed with the development of geographic science, computer technology, remote sensing technology and information science. In the history of computer development, the emergence of computer-aided design technology (CAD) allows people to use computers to process data such as graphics. One of the signs of graphic data is that graphic elements have clear position coordinates, and there are various Topological relationship. Simply put, the topological relationship refers to the spatial position and connection relationship between graphic elements. Simple graphic elements such as points, lines, polygons, etc .; points have coordinates (x, y); lines can be seen as consisting of countless points, and the position of the line can be expressed as a series of coordinate pairs (x1, y1), (x2, y2), ... (xn, yn); the polygon on the plane can be considered as a range formed by a closed curve. There are various interrelationships between graphic elements, such as a point on a line or within a polygon, a line passing through a polygon, and so on. In practical applications, a geographic information system needs to manage very large and complex data. It may have tens of thousands of polygons, tens of thousands of lines, and tens of thousands of points. It also needs to calculate and manage various complex spaces between them. relationship.

GIS system

GIS (geographic information system) is a discipline developed with the development of geographic science, computer technology, remote sensing technology and information science. In the history of computer development, the emergence of computer-aided design technology (CAD) allows people to use computers to process data such as graphics. One of the signs of graphic data is that graphic elements have clear position coordinates, and there are various Topological relationship. Simply put, the topological relationship refers to the spatial position and connection relationship between graphic elements. Simple graphic elements such as points, lines, polygons, etc .; points have coordinates (x, y); lines can be seen as consisting of countless points, and the position of the line can be expressed as a series of coordinate pairs (x1, y1), (x2, y2), ... (xn, yn); the polygon on the plane can be considered as a range formed by closed curves. There are various interrelationships between graphic elements, such as a point on a line or within a polygon, a line passing through a polygon, and so on. In practical applications, a geographic information system needs to manage very large and complex data. It may have tens of thousands of polygons, tens of thousands of lines, and tens of thousands of points. It also needs to calculate and manage various complex spaces between them. relationship.

Chinese name

GIS system

Foreign name

Geographic Information System

Data collection

Editing is mainly used to get data

Data conversion

Guarantee the integrity of the data when it is stored

Application

Environmental monitoring

Geographic information system is an integration of computer hardware, software, geographic data and system management personnel to efficiently acquire, store, update, operate, analyze and display any form of geographic information.

The development of China's GIS is relatively late and has gone through four stages, namely the initial stage (1970-1980), preparation (1980-1985), development (1985-1995), and industrialization (after 1996). GIS has been applied in many departments and fields and has attracted great attention from government departments. From the perspective of application, geographic information systems have been used in resource development, environmental protection, urban planning and construction, land management, crop survey and production, transportation, energy, communications, map mapping, forestry, real estate development, monitoring and evaluation of natural disasters, Finance, insurance, oil and gas, military, crime analysis, transportation and navigation, 110 alarm systems, bus dispatching, etc. have been specifically applied.

There are already urban surveying and mapping geographic information systems or surveying and mapping databases at home and abroad. A batch

There are many colleges and universities offering GIS majors, but when you apply for the college entrance examination, please note that it is divided into science of cartography and geographic information system, which belongs to geography, focusing on the study of applied theory of geography; Surveying and Mapping, focusing on measurement. There is no essential difference between the two. When applying for the exam, you can choose according to your preference. Engineering courses are generally set up in science and engineering colleges, and science courses are generally in comprehensive universities or normal universities. Science, such as the Geographic Information System of Wuhan University's School of Resources and Environmental Sciences, especially the direction of cartography, has unique advantages. The Geographic Information System of Engineering, like Ji University, is more prominent, focusing on data collection and processing, and learning related knowledge of surveying and mapping, GIS and land.