What are the characteristics of dem compared with traditional terrain?

Compared with the traditional topographic map, DEM, as a digital expression of topographic surface, has the following characteristics: it is convenient to display topographic information in various forms.

1) is convenient for displaying terrain information in various forms. After the topographic data are processed by computer software, topographic maps, vertical and horizontal cross-sectional maps and three-dimensional maps of various scales are generated. After processing, topographic maps, vertical and horizontal cross-sectional maps and three-dimensional maps of various scales are produced. However, once the conventional topographic map is made, the scale is not easy to change or needs manual processing. Not easy to change or need manual processing. Once the topographic map is made, the scale is not easy to change or needs manual processing.

2) accuracy will not be lost. Over time, the drawing method of conventional maps will be deformed and the accuracy will not be lost. With the passage of time, conventional maps will be deformed and lose their original accuracy. DEM adopts digital media, which can keep the accuracy unchanged. Lose the original accuracy. DEM uses digital media, so it can keep its accuracy unchanged. In addition, other kinds of maps are hand-made by traditional maps. In addition, the accuracy of other kinds of maps made by hand by conventional maps will be lost, but the accuracy can be controlled by directly outputting DEM. If you use DEM to output directly, the accuracy can be controlled. Easy to realize automation and real-time. General maps must be added and modified.

3) easy to realize automation and real-time. Conventional maps must be added and modified through the same process, which is a labor-intensive and time-consuming work. DEM is digital, the process is the same, the labor intensity is high, and the period is long, while DEM is digital, so you can add and modify topographic information only by inputting the modification information directly into the computer.