Combo Overlay with average overlays: Difference between revisions

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==Use Case Description==
==Use Case Description==


In an area, the locations for a clinic, a school and a sports center are known. Which area is for all three locations within a one kilometer range?
In an area, the locations for a clinic, a school and a sports center are known. Which area contains all three locations within a one-kilometer range?


For this we need to create three [[Average Overlay|average grid overlays]], one for each location. Each location needs to have an identifying attribute assigned to it. Then we need to combine these three overlays in a new combo overlay, linking all three average overlays with a logical formula.
For this we need to create three [[Average Overlay|average grid overlays]], one for each location. Each location needs to have an identifying attribute assigned to it. Then we need to combine these three overlays in a new combo overlay, linking all three average overlays with a logical formula.
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==Formula==
==Formula==
 
To identify the area within range of all three buildings, use the following formula from the [[Combo Overlay#Operators|operators table]]:
As we want to indicate the and combine the area that is within the range of all three buildings, the formula for the use case, based on the [[Combo Overlay#Operators|operators table]] on the combo overlay page, looks like this:


<code>MIN(A, B, C)</code>
<code>MIN(A, B, C)</code>

Latest revision as of 08:51, 8 July 2026

This page describes a use case for implementing a combo overlay.

Use Case Description

In an area, the locations for a clinic, a school and a sports center are known. Which area contains all three locations within a one-kilometer range?

For this we need to create three average grid overlays, one for each location. Each location needs to have an identifying attribute assigned to it. Then we need to combine these three overlays in a new combo overlay, linking all three average overlays with a logical formula.

  • Average Overlay Clinic
    Average Overlay Clinic
  • Average Overlay School
    Average Overlay School
  • Average Overlay Sports center
    Average Overlay Sports center
  • Combo Overlay with average overlays.
    Combo Overlay with average overlays.

Formula

To identify the area within range of all three buildings, use the following formula from the operators table:

MIN(A, B, C)

Where A, B and C are the average grid overlays.

How to

How to add a Combo Overlay with features:
  1. Give each building or area you want to include a specific attribute (ex: 'FOO', 'BAR', 'BOO',...)
  2. Create three Average Overlays, set the cell averaging distance to the desired range
  3. Add a Combo Overlay and select the Average overlays in each slot (A,B and C)
  4. Enter the formula in the Formula field
  5. Enable and adjust the custom legend
  6. Select 'Update Now' in case auto-update was disabled
  • Give each building or area you want to include a specific attribute
    Give each building or area you want to include a specific attribute
  • Create three Average Overlays, set the cell averaging distance to the desired range
    Create three Average Overlays, set the cell averaging distance to the desired range
  • Add a Combo Overlay and select the Average overlays in each slot
    Add a Combo Overlay and select the Average overlays in each slot
  • Enter the formula in the Formula field
    Enter the formula in the Formula field
  • Adjust a custom legend
    Adjust a custom legend
  • Select 'Update Now'
    Select 'Update Now'
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