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NAD83, Web Mercator, and World Mercator - how to align these projections in ArcMap?

FrancesBiles

Hello -

I have a large (equivalent to size of Ireland) line feature class (fc) depicting a shoreline, which I am editing. The shoreline is in Alaska State Plane Zone 1 (meters), NAD83. The NAD83 realization is closest to NAD83(1986) or NAD83(CORS96). The shoreline is in an ArcMap document. The dataframe is set to Alaska State Plane Zone 1 NAD83 [EPSG26931]. I am using ArcMap v. 10.1 on Windows 7.

I have two DigitalGlobe (DG) map services in the ArcMap document:

1) DigitalGlobe Web Map Service:Imagery, which is served in WGS84 [EPSG: 4326], and comes with an option to alternatively receive the image in WGS84 Web Mercator (auxiliary sphere) [EPSG: 3857].

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