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Well, technically, NAD83 is not a subset of WGS84. If you mine further in the SpatialReference.org projetion definitions, you can see the difference between the two projections. PROJ.4 definiton of NAD83: +proj=longlat +ellps=GRS80 +datum=NAD83 +no_defs PROJ.4 definition of WGS84: +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs As you can see, the ...

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