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I have some building data (polygons) as a shapefile in QGIS 2.18. I'm trying to add a location coordinates (the polygons rough center) and an array of the polygons coordinates (its points). I've been able to do the first one using vector --> analysis tools --> mean coordinates which generates a new layer. I can't work out how to get the polygons coordinates though? The end goal is to extract this all to a spreadsheet if that makes a difference.

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  • Welcome to GIS:SE @qu1ckdry! Are you wanting the coordinates of the polygon vertices? Commented Aug 16, 2017 at 12:49
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    If your end goal is to extract it to a spreadsheet, you can right-click your layer, select Save As..., change the Format to csv and change the GEOMETRY to AS_WKT. This will create a csv file with a field containing the coordinates of all vertices for each polygon feature :) Commented Aug 16, 2017 at 12:58
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    Yes this does what I need! Thanks! If you add it as an answer I'll accept it Commented Aug 16, 2017 at 13:32
  • Most welcome, glad it helped! I suggest accepting @artwork21's answer as he describes the steps to bring the csv back into QGIS. Also, I think a very similar question was already asked here: How to export Polygons to CSV with coordinates? Commented Aug 16, 2017 at 13:38

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If you have a common id in the centroid layer and vertice table using Joseph's comment/method you could bring both layer and table in QGIS and perform a join on the common id field and export that joined layer to a .csv.

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  • Thanks for your response artwork21. There is a common ID but I've decided to join everything together in excel as it's easier for me to work with! Commented Aug 16, 2017 at 13:33

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