Tim,
When you say "OS has determined the best position for the label", what
form is this attribute in? Is the x-y position attribute columns? or
some offset x-y attribute? or what?
If it is an x-y position that you would rather use that the default
the_geom geometry position of the feature then it would probably be
possible to create a view that makes that x-y appear as
setsrid(makepoint(x_col,y_col),27700) as the_geom in the view and then
add a record to the geometry_columns table for this view. for
performance you might want to add this column to the orginal table and
index it.
Then you should be able to renter the annotation using the view or the
alternate column in the table.
-Steve W
Tim Urwin wrote:
Hi all,
This is a questuion about label attribute bindings.
We are about to migrate some of our Ordnance Survey MasterMap data from
a propriety system to using mapserver serving the data from a PostGIS
database for screen maps. We are currently using Mapserver 5.02 and are
very happy with the results we have achieved so far, however, due to
only being able to set a single value for the position of a label has
caused much of the text to be badly misaligned with the underlying
features.
OS has determined the best position for the label and provide this as
attribute data for each text label point and we would like to be able to
utilise it. Is there anyway to make the position label attribute accept
a binding as some of the other values do, e.g. angle which we also use.
The problem we have is that no single value works with the data to
provide a good map result, therefore we would like to be able to use
each feature's value as opposed to a global value.
Any help or insights in how to achieve this will be gratefully received.
At the moment our applications access Mapserver via CGI mode directly
without the use of mapscript although we could investigate that option.
The following is an example of one of the entries in the mapfile for a
label layer.
LAYER
NAME "Heritage labels"
METADATA
"wms_title" "Heritage labels"
"wms_srs" "EPSG:27700"
"wms_extent" "0.0 0.0 700000.0 1300000.0"
END
STATUS OFF
CONNECTIONTYPE postgis
CONNECTION "user=XXXX password=XXXX dbname=XXXX host=XXXX port=XXXX"
DATA '"anchorpoint" from "cartographictext" using unique "fid" using
SRID=27700'
PROCESSING "CLOSE_CONNECTION=DEFER"
TYPE Annotation
LABELITEM 'textstring'
FILTER ("layer" = '59')
CLASS
NAME 'Antiquity Text (82)'
LABEL
COLOR 0 0 0
OUTLINECOLOR 255 255 255
TYPE TRUETYPE
FONT arial-italic
SIZE 8
ANGLE [angle]
ANTIALIAS TRUE
POSITION CC
PARTIALS TRUE
ENCODING 'UTF-8'
END
END
MINSCALEDENOM 100.0
MAXSCALEDENOM 5500.0
PROJECTION
"init=epsg:27700"
END
END
many thanks
Tim
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