Arguments
label	type	description
xlo	number	west longitude
ylo	number	south latitude
xhi	number	east longitude
yhi	number	north latitude
Returns
rectangle	variable	a lat/lon rectangle as a geometry variable

Description

georect defines a rectangular region from user-defined latitude/longitude coordinates within an input variable that depends upon latitude and longitude, creating a geometry variable "rectangle" as a result. To define the rectangle, the user provides four arguments in the following order: xlo (the western-most longitude), ylo (the southern-most latitude), xhi (the eastern-most longitude), and yhi (the northern-most latitude).

Example

In the following example, georect is used in conjunction with the Reynolds and Smith Version 2 SSTA data set and the weighted-average function to calculate the Niño3.4 Index in the central Pacific. The Niño3.4 region is defined by the western-most longitude "-170°", the southern-most latitude "-5°", the eastern-most longitude "-120°", and the northern-most latitude "5°". "[X Y] weighted-average" calculates the spatial average of the SSTA values over the Niño3.4 region defined by georect. The use of georect also ensures that area weighting using the cosine of latitude is applied in the "weighted average" calculation.

SOURCES .NOAA .NCEP .EMC .CMB .GLOBAL .Reyn_SmithOIv2 .monthly .ssta
-170 -5 -120 5 georect
[X Y]weighted-average

Live Example Link