Malcolm, review this Procedure to project from NAD 1983 State Plane feet to WGS 1984 Web Mercator Auxiliary Sphere (Los Angeles County, CA): When using the PROJECT utility, make sure to select the Geographic Transformation necessary to convert data between two geographic coordinate systems or datums. Select the Geographic Transformation NAD_1983_to_WGS_1984_5 or a more recent NAD_1983_to_WGS_1984_# 1. Map Projection of Source Feature Class: NAD_1983_StatePlane_California_V_FIPS_0405_Feet WKID: 2229 Authority: EPSG Projection: Lambert_Conformal_Conic False_Easting: 6561666.666666666 False_Northing: 1640416.666666667 Central_Meridian: -118.0 Standard_Parallel_1: 34.03333333333333 Standard_Parallel_2: 35.46666666666667 Latitude_Of_Origin: 33.5 Linear Unit: Foot_US (0.3048006096012192) Geographic Coordinate System: GCS_North_American_1983 Angular Unit: Degree (0.0174532925199433) Prime Meridian: Greenwich (0.0) Datum: D_North_American_1983 Spheroid: GRS_1980 Semimajor Axis: 6378137.0 Semiminor Axis: 6356752.314140356 Inverse Flattening: 298.257222101 2. Map Projection of Target Feature Class: WGS_1984_Web_Mercator_Auxiliary_Sphere WKID: 3857 Authority: EPSG Projection: Mercator_Auxiliary_Sphere False_Easting: 0.0 False_Northing: 0.0 Central_Meridian: 0.0 Standard_Parallel_1: 0.0 Auxiliary_Sphere_Type: 0.0 Linear Unit: Meter (1.0) Geographic Coordinate System: GCS_WGS_1984 Angular Unit: Degree (0.0174532925199433) Prime Meridian: Greenwich (0.0) Datum: D_WGS_1984 Spheroid: WGS_1984 Semimajor Axis: 6378137.0 Semiminor Axis: 6356752.314245179 Inverse Flattening: 298.257223563 >> Geographic Transformation: NAD_1983_to_WGS_1984_5 RESULTS
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