I'm using QGIS 2.6.1 brighton, and I have a problem in computing the area of each layer.

I was actually working on the map of our municipality and I would like to compute the total area of the residential places etc.

The problem is, it actually just gives me 0 when I compute the areas.

I tried using the prs 92 since I'm from the Philippines, but the base map of Google Earth I'm using has a different projections.

What should I do?

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    Welcome to GIS SE! As a new user be sure to take the Tour – TsvGis Sep 9 '15 at 2:13
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    Are you working with shapefiles? Is your residential places projected? – TsvGis Sep 9 '15 at 2:18
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    I would think that WGS84 UTM Zone 51 North would be a good coordinate system, it's also more-or-less compatible with Web Mercator (Google), as for how to transform PRS 92 to WGS84 there's a page namria.gov.ph/prs92 that describes it. – Michael Stimson Sep 9 '15 at 2:39
  • When you say compute, you mean you use the area / distance tool and test the canvas, or you run a calculation and return the result in the attribute table? – BillW Sep 9 '15 at 3:05

First, you need an equal-area projection.

Like Michael Miles-Stimson said, the WGS84 UTM Zone 51 North would be a good coordinate system.

Second, to actually calculate the area, you need to go in the attribute table, add a new column, and use the field calculator with the $area expression.

Hope it helps!

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