3D GIS

3D Data Resources

The main 3d modeling methods include the following aspects.
1.  2D Data: Terrain image, Vector (parameterization, symbolization) 
2.  Man-made Modeling: Max/Sketchup/Maya/..., BIM: Revit/Microstation/Catia
3.  Using Equipment: Oblique Photogrammetry, Laser cloud point, Street view, video
4.  Others: Special effect data,бн

1.Man-made Modeling Method

CAD Models
Using modeling software to generate 3D models; Using satellite image or planning map as base map, photos acquired by cameras as tiling, data or estimations as building height
 
Figure 1 CAD models
 
Building Information Modeling(BIM)
BIM data is an important data source for 3D GIS, allowing 3D GIS changing from macro to micro, realizing detailed management. Also, merging with BIM data allows 3D GIS extending from outdoor to indoor, realizing indoor & outdoor integration management.

2.Using Equipment

Oblique Photogrammetry
By carrying multiple sensors on the same flight platform. Capture images from one vertical, four tilt angles at the same time, and rapidly generate 3D model data with the automation software.
 
 
Figure 2 3D Oblique Photo Models in SuperMap iDesktop
 
Laser Scanning Modeling
Obtain accurate position and outline of objects by point cloud. The texture of models are from oblique images.  
 

 
Figure 3 Point Cloud

3.Use of Existing 2D Data

Stretch Polygons
Stretch polygons in accordance with existing 2D vector polygon, height, texture.
 
 
 
Figure 4  Stretch Polygons in SuperMap iDesktop
 
Modeling by Symbols
Dynamically establish 3D models by vector data, using 3d markers, 3d line symbols, 3d fill symbols to render the vector data.
 
 
Figure 5 Modeling by Symbols in SuperMap iDesktop
Modeling by Parameters
By entering original data (vector and attributes) and following pre-defined rules, build up 3D models
 
 
Figure 5 Modeling by parameters

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