I'm currently working with OS data and have just tried to import a table of google maps coordinates/point data into ARC. The data frame (& layer) coordinate system is as follows:
British_National_Grid WKID: 27700 Authority: EPSG
Projection: Transverse_Mercator False_Easting: 400000.0 False_Northing: -100000.0 Central_Meridian: -2.0 Scale_Factor: 0.9996012717 Latitude_Of_Origin: 49.0 Linear Unit: Meter (1.0)
Geographic Coordinate System: GCS_OSGB_1936 Angular Unit: Degree (0.0174532925199433) Prime Meridian: Greenwich (0.0) Datum: D_OSGB_1936 Spheroid: Airy_1830 Semimajor Axis: 6377563.396 Semiminor Axis: 6356256.909237285 Inverse Flattening: 299.3249646
I've imported the coordinates from google maps as a table, exported it as a shapefile defining the coordinate system to Spherical Mercator (ESPG 3857). I've then imported the data, transformed it to the above projection, in the hope that the two would align. The area of interest is London, and the points appear far further south than they should be - several lengths of the UK further south (but approximately at the right longitude).
Can anyone suggest what I might be doing wrong? I'm at a loss after having followed various online tutorials and how-tos. Sorry if this seems obvious - I'm a beginner.