What is the difference between land surveying and mapping in 2004 and coordinate surveying and mapping now?

1, different technologies. The advantages of modern surveying and mapping technology are increasingly prominent, and more and more surveyors are beginning to realize the importance of modern surveying and mapping technology. The application of total station dynamic GPS technology can ensure the accuracy of measurement data. In 2004, the commonly used instruments for measuring land: level, theodolite and total station. Level can measure the height difference between ground points according to the principle of leveling. The principle is to establish a horizontal line of sight and measure the height difference between two points on the ground.

2. Different methods. In 2004, the traditional photoelectric surveying and mapping method was adopted in land surveying and mapping, and the methods of angle measurement and distance measurement were suitable, so it should not be eliminated immediately. GPS survey has become the main method of land surveying and mapping, and aerial photography technology and satellite images are widely used.