Visual field analysis method and system for historical and cultural block

The invention discloses a visual range analysis method and system for a historical and cultural block, and the method comprises the steps: constructing a current three-dimensional model and a height control three-dimensional model of the historical and cultural block within a protection range of the historical and cultural block based on the obtained building contour vector data and road vector data of the historical and cultural block; a plurality of observation points are arranged on the road center line of the road observation area according to a preset interval distance and a preset viewpoint height; based on a plurality of observation points, performing sight line analysis on the current situation three-dimensional model and the height control three-dimensional model to obtain an actual visual field area and a height control visual field area of each observation point, so as to calculate the proportion of the visual field area occupied by the buildings exceeding a preset height control threshold value in