# Functions
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NewKdNode creates a new node with a properly initialized bbox.
NewNearestNeighborIterator creates an iterator that returns the neighboring points in descending
order.
# Variables
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# Structs
KdNode structure contains the nodes within the tree.
KdTree is an index for 2 dimensional point data.
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# Type aliases
DistanceFunc specifies how to calculate the distance from a point to the extent.