The invention discloses a port
avionics hub digital twin multi-level
simulation model construction and
visualization method, which comprises the following steps: obtaining a multi-view
RGB image of a target port area, obtaining a camera attitude of each view by using an SfM
algorithm, and reconstructing a sparse three-dimensional
point cloud; constructing an LOD2
shell model with a semantic mark; an LLO3 model with holes is constructed; the LOD0-LOD3 model is serialized into a glTF 2.0 binary format and transmitted to a
client side through HTTP / 2, the
client side calls WebGL 2.0 through a browser to complete decompression, uploading and PBR rendering, and interactive plug-in-free
visualization is achieved; constructing an eight-fork-two-fork-four-fork mixed spatial index, and performing multi-stage division and persistence on the LOD < 0 >-LOD < 3 > tiles, so that a
client locates visible tiles within constant
time based on node numbers; visual cone
cutting and
screen space error judgment are adopted to execute progressive loading on visible tiles, LOD0 is loaded at first, then LOD1-LOD3 is subjected to incremental superposition, low-level tiles in the same area are replaced with the LOD3 in a cross
fading mode at the ultra-close distance (the
Euclidean distance d from the center of a camera to the center of a target tile is smaller than or equal to 100 m), and smooth
visual experience is obtained in a browser.