[mapserver-users] RE: How to label only largest displayed areas?

Lime, Steve D (DNR) Steve.Lime at state.mn.us
Thu Feb 2 16:55:26 EST 2012

I'd do this by sorting features based on area (ascending order). This would draw the smallest polygons first, but would put the labels for the shapes with the largest area into the label cache last (where they would be placed and drawn first). I've done this with labeling lakes and it works fine.


-----Original Message-----
From: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Anzel, Phil - NRCS, Fort Collins, CO
Sent: Thursday, February 02, 2012 1:43 PM
To: mapserver-users at lists.osgeo.org
Cc: Anzel, Phil - NRCS, Fort Collins, CO
Subject: [mapserver-users] How to label only largest displayed areas?

Hi, All,

How can I label only the largest displayed areas within an extent? For example, if I'm labeling states of the United States and my extent covers a small region around the Maine, New Hampshire and Massachusetts junction, I only want a single label for each state, chosen by the largest displayed area (within the current map extent) in each state. 

I'm using spatial data stored in Microsoft's SQL Server 2008.

I've created an enhancement request ticket (#4173: Define a current layer extent's WKT string for use in Data statement) as one possible approach, but this approach requires a change to MapServer.

Is there a better way?


- Phil Anzel 
  Vistronix Inc for USDA/NRCS/ITC

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