Decimal degree units

[imap at chesapeake.net]

Brent, Hi... Along these lines, have you tried to index shapefiles
under WinNT?   I have never been able to get shpindex to work
while compiled with MSC6.0.  No errors or anything, but when I
index a shapefile, that layer no longer displays at all.
I was just wondering if you had actually gotten this to work.

Thanks,

-Chris (imap at chesapeake.net)


Brent Fraser wrote:
> 
>   I've made mapserv a memory resident component  using Windows NT,
> ActiveX and Active Server Pages.  And I use PROJ4 to project on the
> fly.  But as Steve pointed out in a previous email, the most significant
> tuning thing you can do is shapefile indexing.  Tile the shapefiles (if
> they aren't already) and make an index shapefile for them.
> 
>   Also, selectively display shapefiles based on scale if you've got a
> couple of different scales of data (eg 1:1m DCW, and Tiger).
> 
> Brent Fraser
> 
> ----- Original Message -----
> From: Rob Atkinson <rob at socialchange.net>
> To: <cshorte2 at csc.com>
> Cc: <mapserver-users at lists.gis.umn.edu>
> Sent: Thursday, August 26, 1999 6:20 PM
> Subject: Re: Decimal degree units
> 
> >
> >
> > cshorte2 at csc.com wrote:
> >
> > > > I'll try the PROJ.4 support, but I'm guessing that the performance hit
> will
> > > > kill me. Some of my maps have thousands of shapes on several layers.
> > >
> > > Rob Atkinson did some work on performance of PROJ.4 and reckoned it
> added 20% to
> > > 30% to the total processing time.
> > >
> > > Cameron.
> >
> > FYI: This was on a shapefile about 20Mb in size, with highly detailed
> polys. Maybe
> > the fixed overheads of file IO are significant.
> > Having a memory resident server rather than a CGI would be the single
> biggest
> > performance boost I think.
> >
> > --
> > --------------------------------------------------------------------------
> ------
> > Rob Atkinson
> rob at socialchange.net
> > Director                                                        Mob 0419
> 202 973
> > Social Change Online Pty Ltd                                Ph  +61
> (2)9557 6500
> > http://online.socialchange.net                              Fax +61
> (2)9519 8940
> >
> >
> >