Combo Overlay with masking: Difference between revisions
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==Use Case Description== | ==Use Case Description== | ||
In | How can I 'mask' (filter out) all values of a rainfall overlay that is not of the highest range? In this case we use the default highest range of 50 cm or more. | ||
For this we | For this we need to add a [[Rainfall Overlay|rainfall overlay]] and a formula we can use to mask the values that are too low. | ||
<gallery> | <gallery> | ||
Image:Rainfall_Overlay1.jpg|Rainfall overlay | Image:Rainfall_Overlay1.jpg|Rainfall overlay | ||
</gallery> | </gallery> | ||
Revision as of 15:41, 8 December 2020
This page describes a use case for implementing a combo overlay.
Use Case Description
How can I 'mask' (filter out) all values of a rainfall overlay that is not of the highest range? In this case we use the default highest range of 50 cm or more.
For this we need to add a rainfall overlay and a formula we can use to mask the values that are too low.
Rainfall overlay
Formula
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 operators table on the combo overlay page, looks like this:
MIN(A, B, C)
Where A, B and C are the average grid overlays.
How to
How to add a Combo Overlay with features:
- Give each building or area you want to include a specific attribute (ex: 'FOO', 'BAR', 'BOO',...)
- 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 (A,B and C)
- Enter the formula in the Formula field
- Select 'Update Now' in case auto-update was disabled
Select Distance Sight Overlay
Select Legend tab
Select "Has Custom Legend"
Add new entry
Edit the name, value and color of the entry
