Landmark data collection method and landmark building modeling method

A landmark data collection method, comprising:

• determining a first basic collection point, a second basic collection point, and a third basic collection point sequentially in an observation area of a landmark building;
• and
• collecting photos of the landmark building based on each of the first basic collection point, the second basic collection point, and the third basic collection point to obtain landmark data of the landmark building, wherein
• when a photo of the landmark building is taken by a camera at the first basic collection point, in a camera picture, at least one of a first ratio, of a size of imaging of the landmark building in a first direction to a size of the camera picture in the first direction, or a second ratio, of a size of the imaging of the landmark building in a second direction to a size of the camera picture in the second direction, is greater than or equal to 85%,
• when a photo of the landmark building is taken by the camera at the second basic collection point, in the camera picture, a ratio of a size of imaging of the landmark building in the first direction to the size of the camera picture in the first direction is approximately 45% to 55% of the first ratio, and
• the third basic collection point is approximately a midpoint between the first basic collection point and the second basic collection point,
• wherein said collecting the photos of the landmark building based on the i-th basic collection point comprises:
• taking a photo of the landmark building by the camera at the i-th basic collection point;
• and
• moving the camera in at least one of a counterclockwise direction or a clockwise direction in the observation area, with the i-th basic collection point being a starting point;
• and determining a collection point at every predetermined distance interval, and taking a photo of the landmark building by the camera at the collection point, until the camera is moved out of the observation area, wherein during the movement of the camera, the camera faces the landmark building, and in the camera picture, a ratio of a size of imaging of the landmark building in the first direction to the size of the camera picture in the first direction remains substantially unchanged, where i=1, 2, 3.