What is 4D?

Apr 26, 2023

4D technology: Digital Elevation Model (DEM), Digital Orthophoto (DOM), Digital Line Drawing (DLG) and Digital Raster Map (DRG).

Digital Elevation Model (DEM)

Digital Elevation Model (DEM) describes ground elevation information and has a wide range of applications in the fields of surveying and mapping, hydrology, meteorology, geomorphology, geology, soil, engineering construction, military and other national economic and national defense construction, as well as humanities and natural sciences.

DEM (Digital Elevation Model)

Digital Orthophoto ( DOM )

Digital Orthophoto is an image data set generated by vertical projection of surface aerospace images. Referring to topographic maps, it is required to cut orthophoto data according to the scope of the map, and then modify the map outline to become a digital orthophoto map (DOM for short). DOM has the image characteristics of a photo and the map Geometric precision is one of the main components of national basic geographic digital achievements.

DOM has the advantages of high precision, rich information, intuitive and realistic, and strong current situation. It is widely used in land survey, topographic map repair and update, digital geospatial framework construction, and smart city construction. The company has the technical ability and rich production experience of 1:500, 1:1000, 1:2000 and other series of scale DOM.

Digital Line Drawing (DLG)

A digital line graph (DLG) is a geographic information vector dataset of topographical elements expressed in the form of points, lines, areas or map-specific graphic symbols.

Tengger project 1:1000 scale digital line drawing

Digital Raster Map (DRG)

Digital raster map (DRG) is a raster dataset that is consistent with topographic maps in terms of content, geometric accuracy and color after scanning, geometric correction and color correction based on existing paper and film topographic maps.