I have creat a Grid layer by Vector grid on QGIS 2.18. Then I saved this project and reopen it, the Grid layer just cannot be shown and its attribute table becomes empty.

May I know what is going wrong here?

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  • îs your grid layer a temporary layer? – LaughU May 22 '18 at 5:40
  • @LaughU. I am new to QGIS, what is a temporary layer, and how to convert it to permanent layer? – mengyu May 22 '18 at 5:42

The Vector grid output is a temporary layer, unless you specified a filename and folder on your disk in the tool's dialogue form.

You can use Save As BEFORE exiting QGIS to turn a temporary to a permanent layer, again specifying filename and folder.

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