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SGIS How-To: Calculate Polygon Area in GIS

How to calculate the total area of a polygon layer?

The calculation of polygon areas stands as a pivotal technique, enabling us to quantify the vastness of spatial features.

The Concept

At the heart of polygon area calculation lies the essence of spatial analysis. Polygons, defined as closed shapes with interconnected vertices, encapsulate diverse features such as land parcels, water bodies, administrative boundaries, and more. We don’t need to further explain Why the quest to measure the area of these complex shapes is so prominent!….

The process may seem daunting to some, but fear not, we got you covered!

Introducing 'Sum Of Areas' Function!

SGIS offers a user-friendly and efficient method to calculate the total area of polygons, be it for selected features or an entire polygon layer. This function calculates the total area of polygons. It can only be activated when the active layer consists of polygon elements.

Step-by-Step Guide for Polygon Area Calculation:

Here’s a step-by-step guide to help you effortlessly navigate this process:

  • Begin by selecting and adding your desired polygon layer to the project.
  • Activate the “Select” function, which allows you to choose specific polygons for area calculation. To select multiple polygons, you can use the “Add to selection” function. Simply click on the desired polygons to highlight them.
  • Once your desired polygons are selected, access the “Sum of areas” function. This tool can be found in the “Advanced Tools” toolbar, located in the main toolbar, as well as in the “Element Data” panel section. A single click on this function will prompt a new pop-up notification window, displaying the calculated area. The units used for the area calculation are based on the coordinate reference system (CRS) of the added layer.
area displayed

Calculating Area for the Entire Polygon Layer:

  • Navigate to the “Selection Toolbar” and select “Select All” to choose all the polygons within the layer.
all polygons selected
  • Click on the “Sum Of Areas” function to initiate the calculation process.
Total sum

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