Mapfile - 50 Layers Maximum ?

[Ken Lord]

Would it be possible to make the max layers value a parameter that is
set at the top of your map file? ... compiled with a default value,
but settable to a higher value when needed?  Or would that introduce
inefficencies into the memory management?

I think those of us who live in the Windows world and are 'compile
challenged'  tend to bump into this problem ... in a less trivial way,
and this seems to pop up on the list every few months.

Cheers,
Ken Lord
Vancouver BC


On 1/13/06, Stephen Woodbridge <woodbri at swoodbridge.com> wrote:
> James Net wrote:
> > Sorry to butt in, but does changing the max limit in "map.h" (to say
> > 1000) and then recompiling have any effect on the speed / efficiency of
> > mapserver if you have have a map file wth only 1 - 5 layers?
>
> I should not effect speed, but it does effect memory consumed as the
> number of layers is staticly allocated. This might indirectly effect
> speed but making less memory available for system buffers, but probably not.
>
> -Steve W.
>
> >> From: Stephen Woodbridge <woodbri at SWOODBRIDGE.COM>
> >> Reply-To: Stephen Woodbridge <woodbri at SWOODBRIDGE.COM>
> >> To: MAPSERVER-USERS at LISTS.UMN.EDU
> >> Subject: Re: [UMN_MAPSERVER-USERS] Mapfile - 50 Layers Maximum ?
> >> Date: Fri, 13 Jan 2006 13:09:51 -0500
> >>
> >> Randy,
> >>
> >> The limit is set in map.h
> >> You can change the limit and recompile
> >> More resent version have a higher limit I think, but I'm not sure what
> >>
> >> -Steve W.
> >>
> >> Randy How wrote:
> >>
> >>>  Greetings,
> >>>  I've come across this rumor/fact, that there is a maximum of 50
> >>> layers in a
> >>> map file.  Unknowingly  I was experimenting the use of MapServer for
> >>> QC'ing
> >>> a project, that I put in 2,500 layers into a mapfile.  Yes, not
> >>> surprisingly
> >>> MapServer baucked about this.  Then the first question is what is the
> >>> limit,
> >>> then I found out that it was 50!
> >>>  I looked in to an existing mapfile that we have and it has 45
> >>> layers.  These
> >>> layers are represented at different scales, and/or by spatial reference
> >>> (i.e. Indices for different UTM zones), then a watermark.
> >>>  We are moving into more global datasets which may be represented the
> >>> same
> >>> way.  There's 60 UTM zones.  So the 50 layer limit is going to be a
> >>> problem
> >>> in the short term.
> >>>  Can anyone verify this fact?  And is there a work around in place to
> >>> accomplish these needs?
> >>>  Thanks, Randy  ________________________________________________
> >>> Randy How
> >>>
> >>> Geospatial Applications Developer
> >>> Voice: +1-970-482-4400
> >>> Fax: +1-970-482-4499
> >>> Web: http://www.i3.com/
> >>>
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> >>> Fort Collins, CO 80524
> >>>
> >
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