ITEMNQUERY - speed / thoughts

[Mike Saunt]

I hit send preamtureley!

Second question is - would it be better to have the layer in PostGIS?  If so
I'm not sure on how to query two layers agaisnt each other (unless like a
SLAYER query)

Any thoughts would be greatly appreciated.

Kind regards
Mike


On 30/01/2008, Mike Saunt <mikesaunt at gmail.com> wrote:
>
> Hi All
>
> I've got a requirement to be able to 'select' multiple features and then
> perform a query against them to find features from other layers that
> intersect.  The goal is for an interactive tool to select polygons which
> will be highlighted on every map redraw (using itemnquery) and when the user
> chooses to have a feature query (itemfeaturequery) against them all.
>
> Our issue is that our selectable layer could have in excess of 1.5 million
> features and the speed for each map refresh / feature qwould be too long.
> We're testing agaisnt MapInfo TAB but can have the layer in Shape or
> PostGIS.
>
> Questions therefore are:
> Can we have an attribute index built against the field for the layer
> somehow that MapServer can read and therefore become ALOT faster?
>
>
>
>
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