Combo Overlay

A combo overlay, combining a Rainfall Overlay with two average grid overlays (NORMAL and SOCIAL), using only the highest values in the last time frame.

The combo overlay is a grid overlay which can combine up to three grid overlays with boolean operators and use these overlays as input arguments functions and operators. The list of available functions and operators is given in the chapter below. Combo overlays can also take other combo overlays as input. Another powerful combination is the use of combo overlays with average overlays (with or without an average distance).

Operators

In the table below are the operators displayed that are supported by the combo overlay. The term argument refers to a grid overlay configured as input, a numerical value or a global name.

Name	Arguments	Type	Displays
SIN	Single		Sine function
COS	Single		Cosine function
TAN	Single		Tangent function
ASIN	Single		Arc sine function
ACOS	Single		Arc cosine function
ATAN	Single		Arc tangent function
ROUND	Single		Round function
FLOOR	Single		Floor function
CEIL	Single		Ceil function
ABS	Single		Absolute function
EXP	Single		Exponential function
LN	Single		The natural logarithm (base e) function
LOG	Single		The natural logarithm (base 10) function
SQRT	Single		The square root function
RANDOM	Single		The random function, which returns a number greater than or equal to 0.0 and less than the provided argument
ADD	Multi		Add one or more argument
MULT	Multi		Multiply one or more arguments
SUB	Multi		Subtract one or more arguments from the first argument
DIV	Multi		Divide the first argument with one or more other arguments
MIN	Multi		Returns the smallest of the provided arguments. That is, the result is the argument closest to negative infinity.
MAX	Multi		Returns the largest of the provided arguments. That is, the result is the argument closest to positive infinity.
POW	Multi		Raises the first argument to the power of the consecutive arguments. For example 2 to the power 3 to the power 4.
OR	Multi		Returns 1.0 if any argument is not equal to 0.0.
AND	Multi		Returns 1.0 if all arguments are not equal to 0.0.
GTE	Pair		Returns 1.0 if the first argument is larger than or equal to the second argument, else returns 0.0.
GT	Pair		Returns 1.0 if the first argument is larger than the second argument, else returns 0.0.
LTE	Pair		Returns 1.0 if the first argument is smaller than or equal to the second argument, else returns 0.0.
LT	Pair		Returns 1.0 if the first argument is smaller than the second argument, else returns 0.0.
NEQ	Pair		Returns 1.0 if the first argument is not equal to the second argument, else returns 0.0.
EQ	Pair		Returns 1.0 if the first argument is equal to second argument, else returns 0.0.
IF	Multi		Takes 3 arguments. If first argument is exactly 1, returns the second argument, else return the third argument.
ERF	Single		The gauss error function, for probability calculations.

Input overlays and timeframes

• Up to three overlays can be configured as input for the combo overlay. They are referenced as A, B and C.
• To query a specific timeframe add its number. E.g. A2 queries timeframe 2 from Input Overlay A.
• To query multiple timeframes add start:end numbers. E.g. A1:5 is identical to "A1 A2 A3 A4 A5".
• When selecting an overlay as just "A" the last timeframe is selected by default
• You can use Globals in a formula

How-to's

• How to add and remove an Overlay
• How to edit a Combo Overlay's formula
• How to edit an overlay legend
• How to add and remove an Attribute

Examples

• Combo Overlay with average overlays
• Combo Overlay with masking
• Combo Overlay with distance filtering

See also

Example of the Combo overlay in the Tygron Platform (Dutch only)

Een parametrisch ontwerp aan milieu-criteria toetsen in het Tygron Platform. (Dutch only)

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Overlays

Categorization

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