[mapserver-users] turning on layers at a particular zoom level

[Fawcett, David]

I assume the 'M' stands for million.  

If you want the layer to be only visible when 'zoomed in' beyond 1:2M, I would set a MAXSCALEDENOM of 2000000.  

If you want the layer to be only visible when 'zoomed out' beyond 1:2M, I would set a MINSCALEDENOM of 2000000.  

If you only want the layer to be visible between resolutions of 1:100000 and 1:200000, you would set:  both MINSCALEDENOM 100000 and MAXSCALEDENOM 200000

These values go in either a LAYER or CLASS of LAYER in your MapServer map file.   


-----Original Message-----
From: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of sunny74
Sent: Friday, August 28, 2009 8:45 AM
To: mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] turning on layers at a particular zoom level



Hi,

Thanks for your reply.
I went thru the link and read about MAXSCALEDENOM/MINSCALEDENOM. So MINSCALEDENOM is the minimum scale level at which a layer will become visible. But I am a bit confused.When the map loads for the first time it has a zoom level of 7 as given in the code below.

map.setCenter(new OpenLayers.LonLat(74.25, 20.35), 7);

In terms of scale it is showing 1:3M. 
What is M? 
If I increase the zoom level i.e do zoom in, scale becomes 1:856K and 1:256K etc i.e scale decreases. So If want a layer to be visible at a scale level of 1:2M what do I write in the mapfile?

How to use TileCache or GeoWebCache?Pls give the js code.


Rahkonen Jukka wrote:
> 
> Hi,
> 
> Mapserver is somehow documented, about adjusting visibility according 
> to scale, try to find MAXSCALEDENOM/MINSCALEDENOM from 
> http://www.mapserver.org/mapfile/layer.html#index-21
> 
> Mapserver does not do caching but you can use for examply TileCache or 
> GeoWebCache between your clients and Mapserver.
> 
> -Jukka Rahkonen-
> 
> 
> 
>> -----Alkuperäinen viesti-----
>> Lähettäjä: mapserver-users-bounces at lists.osgeo.org
>> [mailto:mapserver-users-bounces at lists.osgeo.org] Puolesta sunny74
>> Lähetetty: 28. elokuuta 2009 14:53
>> Vastaanottaja: mapserver-users at lists.osgeo.org
>> Aihe: [mapserver-users] turning on layers at a particular zoom level
>> 
>> 
>> DEar Friends,
>> 
>> I have 12 layers in my map and it is taking tooooo long to
>> load.Therefore I decided to turn on only 2 layers at Page Load.
>> 
>> Rest of the layers I want to turn on  at a particular zoom
>> level.How can I check the zoom level and turn on these layers.
>> 
>> How can make the map load faster especially on page reload? Is it 
>> possible to cache the map or is there some other technique?
>> 
>> Thanks for ur reply.
>> 
>> --
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>> vel-tp3534156p3534156.html
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