question about shp2tile

[Blammo]

The number parameter is telling the slicer/chopper to stop adding to a 
particular tile one that number is reached.

The -q paramter stands for Quad-tree tiling, which uses a overlapping 
unequal tiling scheme that's based on the number of elements in the 
tile.  This works very well for point datasets for example, where there 
are concentration of points in cerain areas and sparsly populated areas 
in other locations. if the data is more os less even spaced over the 
coverage area you can use a gridded tiling system instead with 
essentially the same results.

As far as what number to use, that's a trial and error matter, try one, 
build the tiles, do a query, then try another  . . . .

I've got some datasets with millions of points in them where I went down 
to 10000 points per tile with good results.   If you know what the 
number of average results a particular view is likely to have in it, you 
could use that number for the tiling to get you started.

The benefits of tiling the data go down the more tiles you need to look 
at at query time.

bobb


Zhonghai Wang wrote:

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>Hi folks,
>
>I have a large shapefile, now I am trying to use shp2tile command to slice
>it into pieces, with -r and -c is ok, but I do not fully understand the -q
>parameter, what does it actually mean? and what number should a use for thi=
>s
>parameter normally?
>
>or something like this? -- >shp2tile -q 10000 input_shapefile
>output_shapefile
>
>any clues?
>
>zhonghai
>
>18.05.2006
>
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>Content-Type: text/html; charset=ISO-8859-1
>Content-Transfer-Encoding: quoted-printable
>Content-Disposition: inline
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>Hi folks,<br><br>I have a large shapefile, now I am trying to use shp2tile =
>command to slice it into pieces, with -r and -c is ok, but I do not fully u=
>nderstand the -q parameter, what does it actually mean? and what number sho=
>uld a use for this parameter normally?
><br><br>or something like this? -- >shp2tile -q 10000 input_shapefile ou=
>tput_shapefile<br><br>any clues?<br><br>zhonghai<br><br>18.05.2006<br>
>
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>
>  
>