shp2tile question

[Don Deskins]

Stephen,

Thank you for your reply.

what is the tile2ms command in your answer?  I do not find it on
google or this list

Thanks again.

On Apr 11, 2005 1:01 PM, Stephen Woodbridge <woodbri at swoodbridge.com> wrote:
> Don Deskins wrote:
> > hello, another newbie question.
> >
> > My project has large shp files (2 are greater than 1 gig).  My obvious
> > solution to the speed problem was to tile the shp files.
> >
> > After (finally) getting shp2tile compiled, I tried several different option
> > combinations and got what were to me unexpected results.  What I expected
> > was some kind of world file for each tile and then use shptree to index the
> > files.  What I got of course was a series of shp files.
>
> If you just want to index your shapefile then use shptree shapefile.shp
>
> > My questions are as follows:
> >
> > 1.  How do I figure out how many rows and colums to use in the shp2tile
> > program?  The shp file contains approx 54000 shapes.
>
> There is no magic number. If you data is spread evenly over the area
> then you can expect row*col tile or about 54000/(row*col) in each tile.
> You might have to try some different sizes to get something you are
> happy with.
>
> > 2.  If i use the quadtree option, how do I know what value to use?
>
> Pick the number so that is is as large as possible and that you are
> displaying most of the records for each map draw. That way you open the
> least number of files and you use most all of the objects in each file
> you open. Sorry, no magic number.
>
> > 3.  Is there a way to create an index on the shp files that are produced
> > with the shp2tile program, so that I do not have to create a layer for each
> > shp file?
>
> After you run shp2tile also run:
>
> find /path/to/files -name "*.shp" -exec shptree {} \;
> find /path/to/files -name "*.shp" > tileindex.in
> tile2ms tileindex.in tileindex
> shptree tileindex
>
> and now you can reference you files in a single layer using:
> TILEINDEX "tileindex"
>
> -Steve
>
> > 4.  What else am I missing?
> >
> > Thanks,
> >
> > Don
> >
>
>


--
Don Deskins