Combined Equal-Area Projection
for World Maps, Hungarian Cartographical Studies.
Mollweide (muhl-VIDE-uh): This is an equal-area projection
, which means the sizes of the continents are shown in correct relationship to each other.
Then, in 1946, Bradley published a cylindrical equal-area projection
on the icosahedron, which made him the first to publish an equal-area projection
for polyhedral globes.
in the standard Albers equal-area projection
, with inset projections customized for Hawaii and Alaska insets, in a variety of layouts.
Our analysis of global raster datasets of 1-degree vegetation, 1/2-degree life zone, and 30-arc-second land cover indicates that the equal-area projection
of data in spherical coordinates with standard point-based transformations is only appropriate for high-resolution equal-angle grids.
This, however, is true of any equal-area projection
of rectangular shape.
Applying the DLDM to the Cylindrical Equal-Area Projection
In Figure 5, the Lambert azimuthal equal-area projection
is superimposed on the stereographic projection at the same scale and with the same origin at 0 degrees latitude and 72.
If a global GIS database is built using the vector data structure, an equal-area projection
will preserve the size of individual areas, but research indicates that even these equivalent projections may distort original information when the database is built using the raster GIS data structure (Snyder 1983; 1987; Steinwand 1994; Steinwand et al.
Equations 14 and 15 are two sets of partial differential equations, and with proper boundary conditions their solutions are either a conformal or an equal-area projection
On equal-area projections
, all areas on the map are represented in their correct proportion, which is an essential criterion for the mapping of thematic variables (Hsu 1981 ; Delmelle 9001).
Kimerling (2002) also developed data loss and duplication maps using this method and quantified latitudinal and longitudinal data losses caused by reprojections from the Plate Carree to the equal-area cylindrical, sinusoidal and Lambert azimuthal equal-area projections