Projecting Spatial Data from One Projection to Anotherįor this exercise, we will project the subway data that is in GCS_North_American_1983 to the NAD 1983 New York Long Island State Plane Projection FIPS 3104 Feet projection, so that it matches with the rest of the data. ArcGIS uses the projection of the first dataset that you import in the map. While these two datasets are in different Geographic Coordinate Systems, they are previewed correctly in ArcGIS. If we load another file, in this case the subway routes of New York City, we see that they are in a Geographic Coordinate System defined as GCS_North_American_1983. Here you can see information about the Projection, and we see that our datset for the boundry of New York City is in a Geographic Coordinate System defined as NAD 1983 New York Long Island State Plane Projection FIPS 3104 Feet. This is where we can determine the projection of a dataset. Right click on Properties and navigate to the Source tab. *Equidistant Projections - preserve distances to places from one or two points *Conformal Projections - preserve the shape of small features and show directions correctly (i.e.
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