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Same coordinate system, but look differently in map

Question asked by honglongbocconi on Feb 6, 2016
Latest reply on Feb 6, 2016 by Dan_Patterson

Dear All,

 

I am new to ArcGis family and writing to ask a basic question here.

 

I have added two layers of data (also see the attached picture):

- One is an Africa map which has a self-defined coordinate system (WGS 1984)

- The other one is imported from an excel which has long and lat coordinates.

  Therefore, I created an feature data by creating from XY table and defined its coordinate system as WGS 1984.

 

In the attached picture, I have used one country, Algeria, for example.

Apparently, the point layer of Algeria does not fit the country boundaries.

It seems that the point layer should be shifted a bit left to fit its country.This situation happens for all the other countries.

 

Did I make a mistake in defining the coordinate system or some other issues are ignored by me?

 

I look forward to hearing from you. Thank you in advance for your kind help!

 

Best regards

Long

 

2d97ce175ff3080a8bd9baef7e9bcaab.jpeg

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