Generates a Euclidean distance tile RDD from a small collection of points.
The standard EuclideanDistance object apply method is meant to build
Euclidean distance tiles from a very large, dense set of points where the
generation of the triangulation itself is a significant performance
bottleneck (i.e., when the point set is 10s or 100s of millions strong or
more). In the event that one wishes to generate a set of Euclidean
distance tiles over a large area from a small or sparse set of points which
would exhibit artifacts under the assumptions employed by the dense
EuclideanDistance operator, this apply method will accomplish the desired
end. Be aware, however, that if there are many points, this operation will
have a lengthy runtime.