Texture data acquisition of building surface

Texture data has no effect on the data management and spatial analysis of GIS, but the real texture image is pasted on the surface of terrain model and the surface of building model, which can highlight the visual landscape information and produce a realistic three-dimensional landscape map. The main sources of texture are the texture data and the close-range photographic images of the surface and buildings extracted from aerial imagery. Currently, texture data for buildings is obtained in the following ways:

(1) Direct extraction of photographic photographs of the ground. This method requires the camera to take a large number of building side photos, the advantage is that the building model can be real strong, the disadvantage is that the acquisition speed is slow, and the amount of data is large, the subsequent workload is also large. Building groups with similar textures can model buildings in batches, which reduces the amount of texture gain and the amount of subsequent processing.

(2) by the computer to do a simple simulation drawing. This method adopts vector texture, its advantage is that the data quantity is small, the model browsing speed is fast, but the lack of realism.

(3) obtained by aerial photography. This method mainly obtains the ground image, but the aerial image also contains the side textures of some buildings. The texture obtained by this method is large and the realism is relatively poor, but the acquisition speed is fast.

Texture data acquisition of building surface