[mapserver-users] Question on rfc 86

[Rahkonen Jukka]

Hi,
 
Have you tried GROUP?
 
LAYER
      GROUP "group_layer" 
      NAME "level_1"
      STATUS ON
      TILEINDEX "d:/data/...."
      MAXSCALEDENOM 14000
......      
  LAYER
        GROUP "group_layer"
        NAME "level_2"
        STATUS ON
        TILEINDEX "d:/data/....."
        MINSCALEDENOM 14000
        MAXSCALEDENOM 100000
        
WMS clients will show all the layers in a tree with level_1 and level_2 as members of group_layer.  However, all your users need to do is to add group_layer into their WMS client.
 
-Jukka Rahkonen-
 
________________________________

Lähettäjä: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-bounces at lists.osgeo.org] Puolesta Josh Hevenor
Lähetetty: 15. toukokuuta 2011 5:02
Vastaanottaja: Tamas Szekeres
Kopio: mapserver-users at lists.osgeo.org
Aihe: Re: [mapserver-users] Question on rfc 86


Thanks Tamas, 

The legend is custom build by mapscript and it's a feature of the app that it shows the out of scale layers. I could customize it to group layers that are essentially the same thing if there was a need for it, but I figured I'd see if this new feature would do that for me for free when I upgrade to ms6. 

If the UNION layer respected the source layers {min|max}scaledenom settings that would work for me. Are there any other ways to have a single layer provide more detail when zoomed in? Just curious. 

Josh

On 5/14/2011 3:21 PM, Tamas Szekeres wrote: 

	Josh,
	
	The union layer always retrieve all features from the source layers regardless of their visibility. This is because the source layers are hidden in most cases (STATUS OFF) to avoid the duplication of the features drawn.
	However the desired scale range (MINSCALEDENOM, MAXSCALEDENOM) could indeed be taken into account when accessing the source layers, by using a minor change.
	
	BTW: How the legend is drawn in your case? As far as I know mapserver draws only the layers in the scale range by default.
	
	Best regards,
	
	Tamas
	
	
	
	
	2011/5/14 Josh Hevenor <jhevenor at rogers.com>
	

		This may or may not be relevant but reading RFC 68 got me wondering.
		
		I have an application that has shape file data for lakes. There are
		different shapefiles for data with higher accuracy that are used with
		scale ranges so that only one is drawn at a time.  Specifically
		something like lakes_1_1m, lakes_1_250k, lakes_1_50k.
		
		I'm really looking for a way to show one LAKES layer in the application
		legend instead of 3 layers, two of which are always out of scale. Can or
		should I use a UNION layer to connect these layers? What other approach
		should I consider?
		
		Thanks for the advice,
		
		Josh
		
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