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I'm using QGIS to attempt to calculate the area enclosed by a set of points that I have capture used a GPS device.

I have imported the coordinates from a CSV but when trying to open the field calculator from the layer's attribute table the button is greyed out and cannot be clicked. Here is a screenshot of what I am seeing Calculator not available

Any ideas?

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2 Answers 2

up vote 5 down vote accepted

First save the CSV points to a shapefile. Then try the Points2One plugin to convert the points to a polygon. Then you'll be able to use the Field calculator to get the area of the polygon.

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Thanks. I converted the points to a shape but the field calculator is still not available. Do you know why this might be? cl.ly/image/1D1K3F0m1S0e –  Willburt Jun 17 '13 at 10:11
    
CSVs are read only. That's why it's not possible to edit CSV-based layers. –  underdark Jun 17 '13 at 17:02

First save the CSV points to a shapefile and then you have to toggle the Editing mode to on.

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