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The Albers Equal-Area Conic Projection is an area-preserving conic projection widely used in geographic information systems (GIS) and cartography.

Miller Cylindrical Projection is a map projection method that projects the earth’s surface onto a two-dimensional plane. Its characteristic is that it emphasizes the left-right symmetry (mirror effect) of geographic information. This method is mainly used in scenes that value visual balance and overall grasp. It does not focus on the distance or shape from a specific center point, but focuses more on overall visibility and comparability.

Mollweide Projection is an equal-area pseudocylindrical projection proposed by German mathematician Karl Brandan Mollweide in 1805. The projection maps the earth’s surface onto a flat surface through mathematical transformation, aiming to maintain the accuracy of area ratio while minimizing the distortion of shape and direction. The central meridian of the Mollweide projection is a straight line, the other meridians are symmetrical elliptical arcs, the parallels are parallel straight lines, and the length of the equator is twice the length of the central meridian.

Sinusoidal projection is a pseudo-cylindrical equal-area projection created by French cartographer Samson in 1650. It is also called the Samson projection or the Samson-Flamsteed projection. Its core features are that the latitudes are equidistant parallel straight lines, the meridians are sinusoidal curves symmetrical to the central meridian, the central meridian is a straight line with a length ratio of 1, and the equator is a non-deformed line, which can effectively maintain the accurate area ratio. After projection, the length of the equator is twice that of the central meridian, the poles are projected as points and form protruding edges, and the graticule is symmetrically distributed along the equator and the central meridian.

The polar stereographic projection is a method of projecting the earth’s surface onto a plane. With the pole as the center, the points on the earth’s surface are projected onto a plane tangent to the pole through rays. The core principle is to regard the earth as a sphere, with the pole as the viewpoint, the projection surface as a plane tangent to the pole, the meridians projected as radial straight lines, the latitudes projected as concentric circles, and the meridians and latitudes intersecting at right angles, presenting a spider web shape. This projection method can keep the local angles and shapes unchanged, with less deformation in polar regions, and can accurately maintain the relative distance relationship between points on the earth’s surface, ensuring that the direction on the map is consistent with the actual geographical direction.

Goode Homolosine Projection is a map projection method proposed by John Paul Goode, an American geographer in the early 20th century. This projection combines the characteristics of the Mollweide Projection and the Sinusoidal Projection. It is an equal-area projection and can accurately represent the area of regions around the world.

Van der Grinten projection is a world map projection developed by American geographer Alphons J. van der Grinten in 1898. The notable features of this projection are that it can represent the entire earth in a circle and present a visually balanced and elegant world map by depicting the meridians and parallels as curves.

Stereographic projection is a method of projecting points on the surface of the earth or sphere from a certain point (usually a pole) of the sphere onto a plane. This projection method distributes points on the sphere and projects them from a certain point to the projection plane opposite it, and finally presents them in the form of a circular map. This method was invented by ancient Greek mathematicians and is widely used in many fields such as astronomy, crystallography and map making.