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I have imported a csv into ArcGIS, then displayed xy data. For some unknown reason to me, the point are plotting incorrectly. I am using an ESRI base map in WGS 84 web mercator aux sphere and the display is set to decimal degrees. When I mouse over the correct position in ArcGIS the bottom right coordinates of the mouse match the imported csv properties. enter image description here

If I search using the coordinates in Find locations in ArcGIS, it plots indicates correctly, but the same point imported in via a csv does not as shown in the below image:

enter image description here

Anyone have any suggestions?

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    Looks like it is plotting on "Null Island", suggesting that coordinates are being interpreted as 0,0
    – Leigh Bettenay
    Commented May 26, 2021 at 10:33
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    When you created your event layer did you set the coordinate system to be WGS84?
    – Hornbydd
    Commented May 26, 2021 at 10:40
  • I opened the base map so the workspace took on the WGS_1984_Web_Mercator_Auxiliary_Sphere. I then brought in the csv and in the display xy data it indicated WGS_1984_Web_Mercator_Auxiliary_Sphere in the description.
    – Aed
    Commented May 26, 2021 at 10:50
  • Just to add to the confusion, I have brought the same csv into QGIS and it plots correctly. I then exported the points from QGIS as a shp file and this plots correctly in ArcGIS, but still not the csv when brought in directly to ArcGIS.
    – Aed
    Commented May 26, 2021 at 11:44

1 Answer 1

Reset to default
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Follow the workflow below:

  1. Launch a new blank map document
  2. Follow this to add the X, Y data in ArcMap
  3. Make sure that the Lat and Long are set correctly, and as the values(-0.425, 51.47) are in a geographic coordinate system, specify WGS 1984 as the coordinate system
  4. Once the data is added, add the Basemap to confirm the location
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