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WGS 84 (that spelling) is the name of an ellipsoid (EPSG::7030), the name of a geodetic coordinate reference system (EPSG::4326), and the alias of a datum (EPSG::6326), official name World Geodetic System 1984. WGS84 (no space) is the alias of the ellipsoid (EPSG::7030). WGS 84 is most commonly used to describe the coordinate reference system.

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Account for cell size differences in WGS 84 rasters

Using an equal-area projection will help you equalize the weight of different raster cells since the cells will have... well, equal area. However, doing so will necessarily introduce potentially much …
Jan Šimbera's user avatar
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Difference between converting a projection into WGS84 first before converting it to a intend...

might very well be (I'm not familiar with the systems you mention) that your source and target system have a well-defined and accurate shift while the transformation used by your GIS software to and from WGS84
Jan Šimbera's user avatar
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