Phil,
In theory, it might be possible to do this by extending the labelcache
code to save the clipped area size of each polygon or a clipped length
of a line and then sort the labelcache items by size and label them.
MINDISTANCE could be applied to limit the number of labels using the
existing code. This behavior would need to be triggered by a new LABEL
keyword maybe like PRIORITY [LARGEST|SMALLEST]
If you want to write an enhancement ticket for this in the bug tracker
you can add my comment above, but I suspect that you would have to fund
the development of this or provide a patch.
Best regards,
-Steve W
On 2/3/2012 8:59 AM, Anzel, Phil - NRCS, Fort Collins, CO wrote:
Hi, Jukka and Steve,
Thanks for your replies. Jukka is correct, I do not believe it is
simple. Steve, your approach sorts all areas and then filters by
those visible in the layer's extent. I'm looking for ranking by the
clipped area. For example, if the current map and layer's extent
shows the a small sliver of the mainland of California and a larger
visible part of an island that is part of California, only the island
would be labeled, as its visible area is larger than that of the
sliver.
- Phil
-----Original Message----- From: Rahkonen Jukka
[mailto:[email protected]] Sent: Thursday, February 02, 2012
4:01 PM To: Lime, Steve D (DNR); Anzel, Phil - NRCS, Fort Collins,
CO; [email protected] Subject: Re: How to label only
largest displayed areas?
Hi,
I understood that meaning was to put exactly one label per state.
Each state, even tiny ones, should be labeled. But one state should
get only one label even if the map window is splitting the state
polygon into two or more intersections. Those intersections may be
bigger than the tiny state. Not extremely simple.
-Jukka-
________________________________________ L Lime, Steve D (DNR)
wrote:
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.
Steve
-----Original Message----- From:
[email protected]
[mailto:[email protected]] On Behalf Of Anzel,
Phil - NRCS, Fort Collins, CO Sent: Thursday, February 02, 2012 1:43
PM To: [email protected] 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?
Thanks.
- Phil Anzel Vistronix Inc for USDA/NRCS/ITC
This electronic message contains information generated by the USDA
solely for the intended recipients. Any unauthorized interception of
this message or the use or disclosure of the information it contains
may violate the law and subject the violator to civil or criminal
penalties. If you believe you have received this message in error,
please notify the sender and delete the email immediately.
_______________________________________________ mapserver-users
mailing list [email protected]
http://lists.osgeo.org/mailman/listinfo/mapserver-users
_______________________________________________ mapserver-users
mailing list [email protected]
http://lists.osgeo.org/mailman/listinfo/mapserver-users
_______________________________________________ mapserver-users
mailing list [email protected]
http://lists.osgeo.org/mailman/listinfo/mapserver-users
_______________________________________________
mapserver-users mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/mapserver-users
