Tim,
Well in that case you should be able to set CLASSITEM to your position
attribute. And then set up a CLASS for each position. This is UGLY in
the mapfile, but you should be able to do it now without code changes.
-Steve
Tim Urwin wrote:
Hi Steve,
Unfortunatly not, it is a single digit 1-9 in an attribute field which
we mapped to the two letter characters used by mapserver for text
position, eg ll cc etc. We would just like to be able to look this up
for each feature rather than apply a blanket approach for the layer. We
would prefer not to edit the data as it changes get updated on a regular
basis (we get updates every 6 to 8 weeks from ordnance suervey) and the
database table has just under 22 and a half million entries.
Thanks
Tim
Stephen Woodbridge wrote:
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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