[mapserver-users] Question on rfc 86

[Josh Hevenor]

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 <mailto: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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