making efficient map layers

[Jeff Portwine]

> - Is there any speed reason to split types of roads, based on the CFCC
> type, into different shapefiles or is it just as good to use shp2tile
> and then a tileindex?

If you're showing roads for a large area, you should split them up... I've
had a thread going called "making efficient layers" because I had an issue
just recently where I was killing my web server and some other random
processes because I tried to show a tiger road tile of a large area and it
sucked up all the available RAM in trying to process it... a few people gave
some good advice on splitting things up to improve the speed and
performance.

>On a side not, is it possible to throw a wildcard
> at ogr2ogr, where by you can specify something likek ogr2ogr dst.shp
> src.shp -where CFCC=A1*?  I couldn't figure out if it could take
> wildcards or not.  I suppose you could go through and run it for each
> A1* type and append it to the shapefile, but this could be a long process.

That is a great question... I tried everything I could think of to make the
ogr2ogr command accept a range of options... I tried using regular
expressions like CFCC=A1[0-8] (and variations of this), I tried CFCC=A*, I
tried CFCC=A%... and I tried a few other things and in the end I ended up
doing   CFCC=10, then appending CFCC=11, CFCC=12, etc.    Like you said it
was slow but it did work.

-Jeff


>
> I'm working on familiarizing myself with the National Map offerings and
> will probably have some more questions for you.
>
> Thanks!
>
> Mark
>