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).
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.
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".
