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Coordinate Reference Systems

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"It is vitally important to understand the difference between changing the coordinate reference system (CRS) property of a geographic dataset and converting the feature coordinates of a geographic dataset to a different CRS.  Confusing them can lead to incorrectly located data and potentially some gross errors in the position of the features in your geographic data."


Follow these links to some useful blog articles on how to manage CRS in ArcGIS courtesy of @exprodat


Tip 12: Coordinates and ArcGIS - Blogs -


Correctly Aligning Features in ArcMap: 1 - Blogs -


Correctly Aligning Features in ArcMap: 2 - Blogs -


Correctly Aligning Features in ArcMap: 3 - Blogs -




Using OGP's EPSG Area Polygons

Posted by spk578 Jul 18, 2014

The International Association of Oil and Gas Producers (OGP) released EPSG Area Polygons in 2012 as a freely available spatial dataset that accurately defines the applicable extent of the CRSs and transformations in the EPSG Geodetic Parameter Dataset (EPSG Dataset). 


Check out the @Exprodat Blog on using OGP's EPSG Area Polygons



Download the OGP's EPSG Area Polygons as Searchable Layers