![]() You can download and install the ArcGIS Pro Coordinate System Data files from My Esri. Some transformations that require files are not installed with ArcGIS Pro. In ArcGIS Pro, the best transformation for your map is suggested based on the data and the extent, but you can specify a different one. The best geographic coordinate system to use depends on where and how much of the earth's geography you are mapping. This real-time translation is sometimes referred to as projecting on the fly. The data is not changed by a transformation. The transformation is a calculation to convert the geographic coordinate system of the layers to match the geographic coordinate system of the map as the map draws so that everything is aligned. This is necessary because the earth is actually a lumpy and slightly squashed sphere. ![]() There is more than one geographic coordinate system because each is meant to best fit certain portions of the earth. They use angular units, such as degrees, to assign locations to coordinates on a reference spheroid. Geographic coordinate systems describe how locations on the earth are placed on a hypothetical reference spheroid. ![]() Project data to a new coordinate systemĪ geographic datum transformation is a calculation used to convert between two geographic coordinate systems to ensure that data is properly aligned within a map.
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