[mapserver-users] LABELS - changing from single map to tiles and overlays - HOW?

[thomas bonfort]

If you're using mapcache, turn *off* any openlayers gutter. In your
mapcache.xml config file, set a tileset->metabuffer to a few pixels,
and set your mapfile's labelcache_map_egde_buffer to exactly that same
value. Any other configuration may result in labels appearing
truncated in the openlayer tile'd map.

--
thomas

On 20 March 2013 18:10, Worth Lutz <wal3 at mindspring.com> wrote:
> Ok, I'm beginning to understand all the many variables. I have a mapcache
> which is turned off at the moment as I was trying to work on styling. For
> example, change one thing and redraw. Change it again to figure out what is
> going on.
>
> I plan on using mapcache, so if I use metatiles I then use a "gutter/buffer"
> around the metatile and that eliminates the clipping on the edges of the
> metatile?
>
> I think I'm putting the pieces together now!
>
> Worth
>
> -----Original Message-----
> From: thomas bonfort [mailto:thomas.bonfort at gmail.com]
> Sent: Wednesday, March 20, 2013 12:59 PM
> To: Worth Lutz
> Cc: mapserver-users at lists.osgeo.org
> Subject: Re: [mapserver-users] LABELS - changing from single map to tiles
> and overlays - HOW?
>
> On 20 March 2013 17:49, Worth Lutz <wal3 at mindspring.com> wrote:
>> I've now got labels on my maps when zoomed out but my polygons have no
>> labels if I zoom in away from the label location.
>>
>> I'm using:
>>
>>     PROCESSING "LABEL_NO_CLIP=True"
>>
>> Is this a fixable problem?
> That's the aim of LABEL_NO_CLIP, i.e. only label a polygon at a single
> geographical location to prevent the label from a single polygon
> appearing on every tile if that polygon spans multiple tiles.
>
> YMMV, but you might want to remove LABEL_NO_CLIP and use metatiles on
> your tile cache (e,g: with a 2x2 metatile, your label would only be
> rendered in one of every 4 tiles). If you aren't using a tile cache,
> then there's no easy solution I know of.
>>
>>
>>
>> Are there any examples of getting labels with mapserver and openlayers
> using
>> tiles and multiple overlay layers?
> If you're using multiple label overlays, there's no way to control
> collision between the labels from different layers.
>>
>>
>>
>> I'm still experimenting but still confused.  Any help would be
> appreciated.
>>
>>
>>
>> Thanks,
>>
>> Worth
>>
>>
>>
>> ________________________________
>>
>> From: Worth Lutz [mailto:wal3 at mindspring.com]
>> Sent: Tuesday, March 19, 2013 3:39 PM
>> To: 'Donald Kerr'; 'mapserver-users at lists.osgeo.org'
>> Subject: RE: [mapserver-users] LABELS - changing from single map to tiles
>> and overlays - HOW?
>>
>>
>>
>> Donald,
>>
>>
>>
>> How does the change to "TYPE POINT" work for polygon shapes or do you just
>> change that to "TYPE POLYGON" and only have a label in the "CLASS" block?
>>
>>
>>
>> I'm still confused on how to manage labels on multiple overlay layers.
> That
>> may be a long term project for my application. I was hoping for a simple
>> solution.
>>
>>
>>
>> I did figure out that putting
>>
>>     PROCESSING "LABEL_NO_CLIP=True"
>>
>> in my layer fixed some of my problems of multiple labels with many
> clipped.
>>
>>
>>
>> Thanks for your help,
>>
>> Worth
>>
>>
>>
>>
>>
>> ________________________________
>>
>> From: Donald Kerr [mailto:donald.kerr at dkerr.co.uk]
>>
>> Sent: Tuesday, March 19, 2013 3:29 PM
>> To: 'Worth Lutz'; mapserver-users at lists.osgeo.org
>> Subject: RE: [mapserver-users] LABELS - changing from single map to tiles
>> and overlays - HOW?
>>
>>
>>
>> Worth,
>>
>>
>>
>> I have replaced "TYPE ANNOTATION" with "TYPE POINT" and all is working
> well.
>>
>>
>>
>> As for tiling and labels, I have not found a satisfactory solution at all
>> and have accepted that I am getting partial labels or no labels it the
> label
>> starts in another tile - See here:
>> https://github.com/mapserver/mapserver/issues/4284
>>
>>
>>
>> What I have done is offered an option of "Single Tile" for users so that
>> they can switch between tiled and not. The tiled option gives a better
>> OpenLayers slippy map experience but the single tile option allows for
>> accurate and complete labelling.
>>
>>
>>
>> Regards,
>>
>>
>>
>> Donald
>>
>>
>>
>>
>>
>>
>>
>> From: mapserver-users-bounces at lists.osgeo.org
>> [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Worth Lutz
>> Sent: 19 March 2013 14:52
>> To: mapserver-users at lists.osgeo.org
>> Subject: [mapserver-users] LABELS - changing from single map to tiles and
>> overlays - HOW?
>>
>>
>>
>> Hi all,
>>
>>
>>
>> I'm changing my usage of mapserver from a single map image to using
>> OpenLayers and having MapServer work as a WMS server.
>>
>>
>>
>> My problem is labels. There seem to be too many variables (in MapServer
> and
>> OpenLayers) and I cannot figure out which to set to keep from having
> partial
>> labels, too many labels or overlapping labels.
>>
>>
>>
>> What is the best way to approach labels in a tiled / overlay environment.
>>
>>
>>
>> I noticed that in MapServer 6.0 the "annotation" layer type is deprecated.
>> What is the method for replacing this?
>>
>>
>>
>> In summary, I'm LOST.  Anyone with a map, please point me in the right
>> direction. J
>>
>>
>>
>> Thanks,
>>
>> Worth
>>
>> ________________________________
>>
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