[Xastir] rtree speeds up shapefiles

[Jason Winningham]

On Feb 10, 2005, at 5:09 PM, Tom Russo wrote:

>> What is the reason for the index expiration?
>
> To free up memory that is being wasted by storing indices that aren't 
> being
> used.

So, for the case of my USA-wide shapefiles, the index would initially 
be built for the entire shapefile.  As I view my little area of north 
Alabama, with occasional scrolls into TN, AL, GA, MS, the indices for 
the parts of the shapfile I'm _not_ viewing regularly will be freed, 
but the stuff I'm looking at remains indexed as long as I keep using it 
within that hour time limit ?

-Jason
kg4wsv