[Mapserver-users] Label mindistance not working for me

[Matthew Haines]

That seems to have done it.  I removed the POSTLABELCACHE and now the
streetnames are drawing.  I can change around BUFFER and MINDISTANCE and see
that they are having an effect.  I was not able to duplicate the problem of
all of the labels disappearing.

Thanks a million!

Matthew
----- Original Message -----
From: "Steve Lime" <steve.lime at dnr.state.mn.us>
To: <mhaines94108 at hotmail.com>; <MAPserver-users at lists.gis.umn.edu>
Sent: Monday, January 26, 2004 4:58 PM
Subject: Re: [Mapserver-users] Label mindistance not working for me


Drawing post labelcache should generally be avoided. The only reason it even
exists as an option is for embedded scalebars and legends which are treated
as annotation. With anything drawn after the main labelcache collision
avoidance is not done. That's why you see the overlaps. The question then
becomes why no labels draw when using the cache. Try removing all the xtras,
something like this.

LAYER
NAME "Lion Streets"
CONNECTIONTYPE postgis
CONNECTION "user=postgres dbname=nycpr"
DATA "the_geom from bklion1"
MAXSCALE 6000
STATUS DEFAULT
TYPE LINE
LABELITEM 'street'
CLASS # everything
COLOR 255 255 255
LABEL
ANGLE AUTO
COLOR 132 31 31
SIZE 12
TYPE TRUETYPE
FONT arial
END
END
END

What does this produce? Your value for buffer was quite high and may have
been the problem.

Steve

>>> "Matthew Haines" <mhaines94108 at hotmail.com> 1/26/2004 3:04:20 PM >>>
Steve,

Here's another example of labels colliding.  As you can see, neither
MINDISTANCE nor BUFFER is having any effect.  I tried removing
POSTLABELCACHE TRUE, but when I do that all the labels disappear.  I also
tried adding a CLASSITEM "street" and then EXPRESSION /./, but that didn't
have any effect, either.

Does anyone have any idea what could be causing MINDISTANCE and BUFFER to
generate a map with so many label collisions like this?

Matthew

LAYER
NAME "Lion Streets"
CONNECTIONTYPE postgis
CONNECTION "user=postgres dbname=nycpr"
DATA "the_geom from bklion1"
MAXSCALE 6000
STATUS DEFAULT
FORCE TRUE
TYPE LINE
LABELCACHE ON
POSTLABELCACHE TRUE
LABELITEM 'street'
CLASS # everything
COLOR 255 255 255
LABEL
ANGLE AUTO
BUFFER 100
FORCE FALSE
COLOR 132 31 31
SIZE 12
TYPE TRUETYPE
FONT arial
MINDISTANCE 50
END
END
END



>From: "Steve Lime" <steve.lime at dnr.state.mn.us>
>To: <mhaines94108 at hotmail.com>,<MAPserver-users at lists.gis.umn.edu>
>Subject: Re: [Mapserver-users] Label mindistance not working for me
>Date: Mon, 26 Jan 2004 12:20:25 -0600
>
>The criteria is text comparison of labels within the same layer and same
>class. Presumably you could have a interstate 35 and a state highway 35
>that should be allowed to be close.
>
>Why are you setting LABELCACHE ON and POSTLABELCACHE TRUE?
>
>Steve
>
> >>> "Matthew Haines" <mhaines94108 at hotmail.com> 1/25/2004 8:15:31 PM
> >>>
>I'm having trouble with label mindistance.  I have set it, but my
>labels
>still collide.  What exactly is the equality comparison used?  Is it a
>text
>comparison of the label names?  My data file has a different line
>segment
>for each block on the street.  If the map is zoomed to show eight
>blocks, I
>get eight labels.  A few extra labels is okay, but not when they are
>all on
>top of each other.
>
>Adding or removing BUFFER, MINDISTANCE, and MINFEATURESIZE all don't
>seem to
>change the output map, which has identical labels stacked to the point
>of
>illegibility.
>
>Matthew
>
>LAYER
> NAME "bk_streets"
> CONNECTIONTYPE OGR
> CONNECTION "data/streets/lion03C/bklion.tab"
> MAXSCALE 6000
> STATUS DEFAULT
> FORCE TRUE
> TYPE LINE
> LABELITEM 'Street'
> LABELCACHE ON
> POSTLABELCACHE TRUE
> CLASS
> COLOR 255 255 255
> LABEL
> ANGLE AUTO
> COLOR 31 231 31
> BUFFER 100
> FORCE FALSE
> MINFEATURESIZE AUTO
> SIZE 12
> TYPE TRUETYPE
> FONT arial
> MINDISTANCE 50
> END
> END
>END
>
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