[mapserver-users] Display performance

[Chris Jackson]

Steve

I don't have postgis, hence the fishing around for answers from helpful
people like yourself!  You are right about playing around with
generalisations, unfortunately the colouring is very specific and needs to
match other GIS outputs, so will have to still 'look' right - something I
will have a play with in due course.  Once you zoom in the data is quite
usable - ie. the spatial index is doing it's job, so not all is lost.

Thanks for the ideas

Chris

On 2 September 2010 21:36, Lime, Steve D (DNR) <Steve.Lime at state.mn.us>wrote:

>  If you have postgis already sitting around then it’s pretty quick just to
> try it and see.  I’m assuming you’re talking 20sec for everything, all 170K
> features? A spatial index doesn’t buy you anything in the ‘all’ case. That
> is a lot of features to display at once and I wonder if one can even make
> sense of that much detail. A common technique would be display reduced or
> somehow generalized versions of the data at that level and then hit the
> detailed data as a user zooms in. Without knowing the data how you’d do that
> would vary. For example, you could actually rasterize the data and display
> the pre-rendered raster version small scales. Or you might be able to thin
> the data a bit. Lots of options.
>
>
>
> Steve
>
>
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