NetLogo 7.0.0-beta2:

gis:envelope-union-of

gis:envelope-union-of envelope1 envelope2 gis:envelope-union-of envelope1...

Reports an envelope (bounding rectangle) that entirely contains the given envelopes. An envelope consists of a four-element list of the form

[minimum-x maximum-x minimum-y maximum-y]

No assumption is made about the coordinate system of the arguments, though if they are not in the same coordinate system, results will be unpredictable.

Take me to the full GIS Extension Dictionary