  We demonstrate a method for using arrays of point sources that emulate --
when measured from a standoff of at least several meters -- distributed
gamma-ray sources, and present results using this method from outdoor aerial
measurements of several planar arrays each comprising up to $100$ ${\sim}7$ mCi
Cu-64 sealed sources. The method relies on the Poisson deviance to
statistically test whether the array source ''looks like'' its continuous
analogue to a particular gamma-ray detector given the counts recorded as the
detector moves about 3D space. We use this deviance metric to design eight
different mock distributed sources, ranging in complexity from a $36\times36$ m
uniform square grid of sources to a configuration where regions of higher and
zero activity are superimposed on a uniform baseline. We then detail the
design, manufacture, and testing of the ${\sim} 7$ mCi Cu-64 sealed sources at
the Washington State University research reactor, and their deployment during
the aerial measurement campaign. We show the results of two such measurements,
in which approximate source shapes and qualitative source intensities can be
seen. Operationally, we find that the point-source array technique provides
high source placement accuracy and ease of quantifying the true source
configuration, scalability to source dimensions of ${\lesssim}100$ m, ease of
reconfiguration and removal, and relatively low dose to personnel. Finally, we
consider potential improvements and generalizations of the point-source array
technique for future measurement campaigns.
