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Problem Define Project of XY data

Question asked by macqent on May 29, 2014
Latest reply on Jun 4, 2014 by macqent

I have a problem to define the projection of my XY data :
Here bellow are my XY data of location in Scotland


On arcgis I : add data => display XY data => Projected Coordinate System:   Name: British_National_Grid Geographic Coordinate System:   Name: GCS_OSGB_1936


then I Export data and I get this


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


I think the problem come from the part in bold. Have you an idea ? Thank you.

I use ArcMap 10, Windows 7, Excel 2010