shp2tile question

[Stephen Woodbridge]

Don Deskins wrote:
> Stephen,
>
> Thank you for your reply.
>
> what is the tile2ms command in your answer?  I do not find it on
> google or this list

Sorry, a typo, should be tile4ms

> 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
>>>
>>
>>
>
>