How can I ask respondents follow-up questions on the locations that they mark on the map?
You can add pop-ups to all three types map questions (map point, line or polygon/area). It's an excellent way of combining precise GIS data with more qualitative information.
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Click Create pop-up.
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Add the questions that you want to ask from the element library.
Edit or delete an existing pop-up feature
If you want to return to edit the pop-up window, or want to delete it without deleting the entire element, simply access the element drop-down menu as you did when creating the pop-up window and choose accordingly.