[ka-Map-users] layer visibility control

[Paul Spencer]

Bahi,

this is more appropriate for the mapserver-users mailing list.  In  
any case, you control layer visibility by adding minscale/maxscale to  
either layers or classes inside layers.

For information on layer objects,

http://mapserver.gis.umn.edu/docs/reference/mapfile/layer

You may also find this useful:

http://umn.mapserver.ch/index_en.php

You should note that because ka-Map uses fixed scale values for  
zooming, you can easily pick scale values (between the ka-Map ones)  
for your minscale/maxscale.

For instance, if you have 4 scales in your application:

1000000, 500000, 250000, 100000

and you want a layer to turn on for only 250000, 100000 then that  
layer would have:

maxscale 250001 #or any value up to 499999

and if you wanted a layer to turn on only for 1000000, 500000 then  
that layer would have

minscale 499999 #or any value down to 250001

and if you wanted a layer to turn on only for 500000, 250000 then  
that layer would have

maxscale 500001 #or any value up to 999999
minscale 249999 #or any value down to 250001


Cheers

Paul

On 4-Apr-06, at 5:27 AM, Bahi AL_Fkharany wrote:

> hi every body
> can one help me about how to control layer visibility
> via  the (minscale and maxscale) of layer object in
> map files not via the status attribute,
> thanks for your times.
>
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|Paul Spencer                           pspencer at dmsolutions.ca   |
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|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
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