Breaking up shapefiles Re: [Xastir] ESRI shapefiles and dbfawk

[Curt Mills]

On Sat, 18 Dec 2004, James Ewen wrote:

> The split_shape programs work great. I've been able to pull the main
> highways out, creating a much smaller file to display the province wide
> data.
>
> I also split the province into maidenhead gridsquare sized chunks of street
> level detail.
>
> This has sped up the display routines dramatically. Instead of having to
> parse a 500 MB file every time it needed to update the map, Xastir only
> needs to process a much smaller portion of the data.
>
> I've dropped from about 45 seconds down to about 2 seconds to redraw the
> screen.

Have you seen what the experimental code does that Tom added to
Xastir?  Man, after the initial read, it's FAST!

Makes me really look forward to the day when we can pre-process all
of our map data as we import it into our datastore, then pull it out
at lightning speed in the datum/coordinates we like for drawing.

-- 
Curt, WE7U.				archer at eskimo dot com
http://www.eskimo.com/~archer
  Lotto:  A tax on people who are bad at math. - unknown
Windows:  Microsoft's tax on computer illiterates. - WE7U.
The world DOES revolve around me:  I picked the coordinate system!"