Combo Overlay with masking: Difference between revisions

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Created page with "This page describes a use case for implementing a combo overlay. ==Use Case Description== In an area, the locations for social and normal housing are known..."
 
 
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==Use Case Description==
==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.


In an area, the locations for social and normal housing are known. Where does severe rainfall (50cm or higher) have impact on social and normal housing?
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.
 
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.


<gallery>
<gallery>
Image:FOO-attr-avg-1.jpg|Average Overlay Clinic
Image:Rainfall_Overlay1.jpg|Rainfall overlay
Image:BAR-attr-avg-1.jpg|Average Overlay School
Image:Combo_Overlay_with_masking1a.jpg|Combo Overlay with masking
Image:BOO-attr-avg-1.jpg|Average Overlay Sports center
Image:Combo_Overlay_with_features1.jpg|Combo Overlay with features
</gallery>
</gallery>


==Formula==
==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 [[Combo Overlay#Operators|operators table]] on the combo overlay page, looks like this:
We want to only show the highest rainfall values, so we want to use all values that are greater than 49 cm (0.049m), and only of the last timeframe (index 24 in this case). Using the [[Combo Overlay#Operators|operators table]], this gives us the following formula:


<code>MIN(A, B, C)</code>
<code>MULT(GTE(A24, 0.049), A24)</code>


Where A, B and C are the average grid overlays.
Where <code>A24</code> is the last time frame of the rainfall overlay (timeframes are 0-indexed).


==How to==
==How to==


{{Editor steps|title=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}}
{{Editor steps|title=add a Combo Overlay with masking
|Add a [[Rainfall Overlay]] (give it a significant rain event).
|Add a Combo Overlay and select the rainfall overlays in [[A prequel (Combo Overlay)|Prequel A]].
|Enter the formula in the Formula field.
|Enable and adjust a custom legend as desired.
|Select 'Update Now'}}
<gallery>
<gallery>
Image:Add_Attr-1.jpg|Select Distance Sight Overlay
Image:Rainfall_Overlay1.jpg|Add a [[Rainfall Overlay]]
Image:Create_Avg_Overlay1.jpg|Select Legend tab
Image:Select_Rainfall_overlays_in_slot1.jpg|Select the Rainfall Overlay for [[A prequel (Combo Overlay)|Prequel A]].
Image:Select_AVG_overlays_in_slot1.jpg|Select "Has Custom Legend"
Image:Enter_formula_in_field2.jpg|Enter the formula in the Formula field
Image:Enter_formula_in_field1.jpg|Add new entry
image:Custom_legend_combo_with_features2.jpg|Adjust a custom legend
Image:Select_Update_Now1.jpg|Edit the name, value and color of the entry
Image:Select_Update_Now2.jpg|Select 'Update Now'
</gallery>
</gallery>
{{clear}}
 
{{article end
|seealso=*[[Combo Overlay]]
}}

Latest revision as of 08:38, 14 October 2026

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
    Rainfall overlay
  • Combo Overlay with masking
    Combo Overlay with masking

Formula

We want to only show the highest rainfall values, so we want to use all values that are greater than 49 cm (0.049m), and only of the last timeframe (index 24 in this case). Using the operators table, this gives us the following formula:

MULT(GTE(A24, 0.049), A24)

Where A24 is the last time frame of the rainfall overlay (timeframes are 0-indexed).

How to

How to add a Combo Overlay with masking:
  1. Add a Rainfall Overlay (give it a significant rain event).
  2. Add a Combo Overlay and select the rainfall overlays in Prequel A.
  3. Enter the formula in the Formula field.
  4. Enable and adjust a custom legend as desired.
  5. Select 'Update Now'
  • Add a Rainfall Overlay
    Add a Rainfall Overlay
  • Select the Rainfall Overlay for Prequel A.
    Select the Rainfall Overlay for Prequel A.
  • 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'

See also

Retrieved from "https://support.tygron.com/w/index.php?title=Combo_Overlay_with_masking&oldid=95701"