Calculate the Count, Sum and Average of attributes in a group - "Attribute Data > Overlays in Group"

Notes:

To learn the basics about attributes, we recommend you perform the procedure at this link: How to manually add an attribute to an overlay

In this example, we will calculate the Count, Sum and Average of the Area SQKM of overlays in a group.

Create the overlays

1. Create 2 or more overlays.

   To learn how to create the overlays, visit these links

    

   Rectangle Tool—Draw a rectangle
   

   Circle Tool—Draw a circle

   Polygon Tool—Draw a polygon
   

    

Add the overlays to a folder

2. At the top of the Layers Panel, click on the Folder Icon displaying the tooltip: "Add Group".
   You will see the folder added to the Layers Panel.
    
3. Click and drag each overlay’s row into the folder.
   The folder now holds a set of overlays, so the folder is considered a Group.

   To learn more about grouping overlays, see; Grouping markers/elements by using folders.

Create an Area SQKM attribute

4. Add the attribute.

   To learn how to create an Area SQKM Attribute, see; Enforce the type of values in a shared attribute.

Calculate the Count, Sum and Average

5. At the top of the Layers Panel, click on the Toolbox's gear and wrench icon.
   You will see a window with Core Operations and Plugin options appear. 
    
6. Under the "Aggregate" heading > "Attribute Data" subheading, click on the link: "Overlays in Group".
    
7. Under the "Select Group" heading, click the button: "Select".
    
8. Click to select the group from the list.
    
9. Under the "Sum/Average/Count" heading, locate the "Area SQKM" attribute. Then select Sum/Avg/Count from the drop-down menu.
    
10. Click the "Aggregate Data" button.
    A new window will appear, with a table of the overlays and the Area SQKM attribute. At the bottom, you will see the Count, Sum and Average of the attributes in the table.