List of Combo Overlay examples

Solid Buildings

The attribute SOLID generally has a value of 0 or 1. It can therefore be used directly in a Combo Overlay Formula.

• Set Combo Maplink to BUILDINGS
• Set Key A to SOLID
• Set Formula to:

  @A

Residential Buildings

The unit size category values can be used to identify and rasterize residences, in combination with a GT (Greater than) function with multiple arguments. To setup:

• Set Combo Rasterization to "Attribute:Specific Layer" (SINGLE_LAYER)
• Set Combo Maplink to Buildings
• Set Key A to SOCIAL_UNIT_SIZE_M2
• Set Key B to NORMAL_UNIT_SIZE_M2
• Set Key C to LUXE_UNIT_SIZE_M2
• Set Key D to STUDENT_UNIT_SIZE_M2
• Set Key E to SENIOR_UNIT_SIZE_M2
• Set Formula to:

  GT(@A,@B,@C,@D,@E)

Categorized Residential Buildings

The unit size category values can be used to identify and rasterize residence types, in combination with a IF and GT (Greater than) functions with multiple arguments. We will categorize the residential buildings as followed: SOCIAL (1) , NORMAL (2), LUXE (3), SENIOR (4), STUDENT (5) and everything else 0.

To setup:

• Set Combo Rasterization to "Attribute:Specific Layer" (SINGLE_LAYER)
• Set Combo Maplink to Buildings
• Set Key A to SOCIAL_UNIT_SIZE_M2
• Set Key B to NORMAL_UNIT_SIZE_M2
• Set Key C to LUXE_UNIT_SIZE_M2
• Set Key D to SENIOR_UNIT_SIZE_M2
• Set Key E to STUDENT_UNIT_SIZE_M2
• Set Formula to:

  IF(GT(@A,0),1,IF(GT(@B,0),2,IF(GT(@C,0),3, IF(GT(@D,0), 4, IF(GT(@E,0),5,0))))

Minimum infiltration among layers

An example on how the combo overlay can obtain rasterized data from multiple data layers (MapLinks); Terrains, Buildings, Neighborhoods, Areas and Zones.

• Set Combo Rasterization to "Attribute:Min value" (MIN)
• Set Combo Maplink to nothing (null)
• Set Key A to GROUND_INFILTRATION_MD
• Set Formula to:

  @A

See also

• Combo Overlay
• Combo Overlay tutorial