True 3D GIS technology GIS can represent the main characteristics of urban space, and the correspondence between GIS system data and spatial geographic entities, so GIS is also the basis for the digitization of elements in digital city night lighting planning. General GIS software regards elevation as an attribute of geographic entities, so GIS software can be regarded as a virtual three-dimensional (2.5-dimensional) environment, while urban underground space, pipelines, multi-storey and high-rise buildings, interchange roads, rivers, and mountains Etc., all need true 3D GIS technology support.
GIS software has certain problems in 3D modeling and display, that is, pure GIS software also shows insufficient performance in 3D representation and graphics processing. Therefore, it is necessary to study the data structure, organization, and key technologies of spatial relationship and analysis of real 3D GIS, and perform virtual city night illumination and digital elevation model (DEM), digital line map (DLG), digital orthophoto Data fusion of image map (DOM) and digital grid map (DRG), which is the necessary data foundation for digital city night lighting planning, especially the integration of DOM, DLG and DEM, which is difficult to achieve with a variety of single software. It realizes a new mode in which 4D data expresses topography and landforms in holographic manners such as symbols, elevations and images.
S data acquisition and management technology Geographic Information System (GIS) is a computer information system for collecting, simulating, processing, retrieving, analyzing and expressing large-scale geospatial data, but should use the spatial analysis simulation function of GIS and remote sensing system ( RS) Dynamic update of information and precise spatial positioning of the Global Positioning System (GPS).
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