What is the technical realization of Baidu 3D Earth?

The three-dimensional city models of electronic maps are all mixed modeling technologies. For example, the physical model of the building is obtained by photogrammetry, and the texture obtained by other sensors is automatically pasted. We will refer to the most effective modeling technology to realize different data volumes.

Generally speaking, three-dimensional city modeling is divided into two steps. First of all, aiming at the appearance, scale measurement and texture mapping collection of the real world, based on photos and texture data, the modeling technology is feasible and realistic 3D effects can be achieved. According to the measurement range, we can divide different areas into different areas in batches according to different situations according to ① automatic photography modeling technology, ② traditional manual modeling, ③ laser point cloud data modeling and ④ parametric batch modeling.

① Large amount of data, mainly using laser point cloud data modeling technology, mostly used for visual elevation modeling of strip terrain such as roads and buildings on both sides;

(2) Medium data volume, mainly using automatic photography modeling technology and traditional manual modeling technology, which can model large-scale urban landforms. ThingJS supports city-level and park-level scene modeling, and is one of the partners of Gaode Map, providing 3D visualization technical cooperation. Now the 3D source code is free and open, and registration is also free.

③ The amount of data is small, mainly parametric batch modeling.

All the above modeling techniques can use 3DSMAX, CAD, Sketch Master, Revit and ThingJS, which are emerging 3D frameworks in recent two years. They are particularly friendly to front-end developers, and can quickly model without learning advanced modeling or 3D expertise.

In order to develop 3D projects quickly, ThingJS provides an extension of model base, and100000 scenes can be selected at will, with good results.