Create localtree (a quadtree index of all US block centroids) in package cache

Create localtree (a quadtree index of all US block centroids) in package cache

Usage

indexblocks()

Value

Returns the quadtree index invisibly. Side effect is it creates the index in the package cache.

Details

Note this is duplicated code in .onAttach() and also in global_defaults_*.R

.onAttach() can be edited to create this when the package loads, but then it takes time each time a developer rebuilds/installs the package or others that load EJAM.

It also has to happen in global_defaults_*.R if it has not already.