National Aeronautics and Space Administration (NASA) has this great tool called G.Projector for exploring complex Map Projection not easily implemented in common cartographic or GIS tool. The software is based o Java and it is available on major operating system like Windows, macOS and Linux. G.Projector is an interactive tool for exploring map projections. It takes an input map image, typically in Equirectangular form (also called Cylindrical Equidistant), and transforms it to one of over 200 other projections.
Download and launch G.Projector from the official website, it is a simple standalone software (no installation is required), however you need to have Java 11 or higher installed on your machine.
To start using G.Projector, you need to have a basemap (source map) of the globe in one of the following projections namely: Aitoff, Cylindrical equal Area, Equirectangular, Hammer, Robinson, or Winkel Tripel. Your source map in any of the projections above can then be transformed to one of over 200 other projections. An important note is that your input map image, must not have a border or extra margins around the edges.
The steps required are as follow;-
1) Launch the G.Projector software
2) Go to "File" >> "New with import…", select your base map and choose its corresponding map projection such as "Equiretangular" as "Input projection"
3) In the "Projection" tab, select the new map projection type you want to transform the map into. As an example, here I choose "Sinusoidal" as projection mode with Interrupted: 30° Gores
4) In the "Graticule" tab, set the "Stroke" as you want
5) In the "Overlays" tab, select <None> for "Overlay 1".
6) In the "Border" tab, set "Weight" to 0%.
7) Export the current view now under "File" >> "Save Map as…"
That is it!
Happy Map Projection
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