[Xastir] Rtree

[Gerry Creager N5JXS]

One discussion we've been having on the Mapserver list is that use 
large, all-encompassing shapefiles becomes more efficient when you weed 
out all the layers you don't need/want, and make, oh, say, 2 or more 
shapefiles thereof.

gerry

James Ewen wrote:
>> The very first time a shapefile is drawn in a window that's smaller than
>> the full file extent, every shape in the file is read and its extents 
>> saved
>> in the rtree index for that file.  Then, any shape that's in the current
>> window is read in and drawn --- that's why the first draw of a file is 
>> slower.
> 
> 
> Sounds almost exactly like what I did by chopping the dataset up into 
> smaller bits. Xastir looks at the extent of each file and only uses the 
> ones within the viewing window. I could increase efficiency a little 
> more by chopping the files into smaller chunks again.
> 
> I did spend a couple hours chopping the file up with the program you 
> created Tom, but I think it was worth the effort! I'm saving a bit of 
> wear and tear in the hard drive too!
> 
> James
> 
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-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
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