When all inputs are in the same coordinate system, you will avoid possible performance and functional issues caused by projecting data on the fly. It is recommended that all inputs for a project be projected to the same coordinate system prior to performing analysis. These can be deleted using the Repair Geometry tool. Features that fall completely outside the horizon will be written to the output with a null shape. The exception is participating stand-alone tables.ĭepending on the input feature's coordinates and the horizon (valid extent) of the output coordinate system, multipoints, lines, and polygons may be clipped or split into more than one part when projecting them. If the input participates in relationship classes (as with feature-linked annotation), the relationship class will be transferred to the output. A feature dataset containing a topology: the topology should be validated again.A feature dataset containing a network dataset: the network dataset must be rebuilt.When projecting the complex data types listed below, certain operations must be performed on the resulting data: The memory workspace is not supported as a location to write the output dataset. For a list of transformations and their area of use, see the knowledge base article How To: Select the correct geographic (datum) transformation when projecting between datums.For example, if you're converting data from WGS 1984 to NAD 1927, you can choose a transformation called NAD_1927_to_WGS_1984_3, and the tool will apply it correctly. However, projecting from GCS_North_American_1983 to WGS_1984_UTM_Zone_12N requires a geographic transformation because the input coordinate system uses the NAD_1983 datum, while the output coordinate system uses the WGS_1984 datum.
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