What is spherical panorama, cylindrical panorama and cubic panorama?

1. Spherical panorama is to take the latitude and longitude coordinates of the sphere directly to a grid with abscissa and ordinate, and the height of this grid is about twice the width. Therefore, from the equator to the poles, the lateral stretching intensifies, and the north and south poles stretch into a flat grid throughout the upper and lower edges. Spherical panorama can realize horizontal and vertical 360 panorama.

2. Cylindrical panorama is similar to spherical panorama, except that as the target approaches the north and south poles, it will also stretch longitudinally, and the two poles will stretch longitudinally indefinitely (so there are no horizontal lines at the top and bottom of this plane grid). Therefore, cylindrical projection is not suitable for images with very large vertical viewing angle. Cylindrical projection is a standard projection method provided by traditional swing lens panoramic film camera. It keeps the size of the target more accurately than linear projection, but it renders the straight line parallel to the observer's line of sight into a curve.

3. Cube panorama is to divide the panorama into six faces, front, back, left, right and top. When browsing, the six faces are combined into a closed space to realize the overall horizontal and vertical 360 panorama.