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I have a layer of point that I convert to a line with the plugin Point2One to be able to do apply a smoothing with the generalizer tool. It works well! then I convert my layer back to points using the vector tool extract vertices and when I look at the attribute table everything looks good except that all my points number became 201. The thing is I need the point numbers.

My point number is the field 6 in the image

enter image description here

I tried to duplicate them, add some letter before, add an other row of point number starting from 1 (mine does't), change the field type. Nothing worked I get 201 in all of these cases...

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    Welcome to GIS.SE Maud! Have you tried join attributes by location between your old and your new pointlayer? – Erik Oct 25 '18 at 13:37

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