Hello, I have a problem to define the projection of my XY data : Here bellow are my XY data of location in Scotland [ATTACH=CONFIG]34173[/ATTACH] On arcgis I : add data => display XY data => Projected Coordinate System: Name: British_National_Grid Geographic Coordinate System: Name: GCS_OSGB_1936 [ATTACH=CONFIG]34174[/ATTACH] then I Export data and I get this [ATTACH=CONFIG]34175[/ATTACH] This layer have this Data Source : Projection: Transverse_Mercator False_Easting: 400000.000000 False_Northing: -100000.000000 Central_Meridian: -2.000000 Scale_Factor: 0.999601 Latitude_Of_Origin: 49.000000 Linear Unit: Meter (1.000000) Geographic Coordinate System: GCS_OSGB_1936 Angular Unit: Degree (0.017453292519943299) Prime Meridian: Greenwich (0.000000000000000000) Datum: D_OSGB_1936 Spheroid: Airy_1830 And then I would like to add a polygon layer of Scotland : Data Type: Shapefile Feature Class Shapefile: C:\Users\77780575\Desktop\Arcgis\Scotland Country Boundary\Scotland boundary.shp Geometry Type: Polygon Projected Coordinate System: British_National_Grid Projection: Transverse_Mercator False_Easting: 400000.00000000 False_Northing: -100000.00000000 Central_Meridian: -2.00000000 Scale_Factor: 0.99960127 Latitude_Of_Origin: 49.00000000 Linear Unit: Meter Geographic Coordinate System: GCS_OSGB_1936 Datum: D_OSGB_1936 Prime Meridian: Greenwich Angular Unit: Degree My XY data are not matching with the polygon layer as you can see here bellow [ATTACH=CONFIG]34176[/ATTACH] I think the problem come from the part in bold. Have you an idea ? Thank you. I use ArcMap 10, Windows 7, Excel 2010
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