[MapServer-dev] More precise WMS GetFeatureInfo for point symbols: ask for opinions

[Even Rouault]

Le 08/09/2025 à 23:13, Steve Lime a écrit :
> I could also see this enhancement being useful for native point-based 
> queries too (e.g. mode=query or mode=nquery).

I guess they could be enhanced to use that functionality.  The would 
need to populate the new query->getFeatureInfo->x_pixel and 
query->getFeatureInfo->y_pixel fields, so a new X_PIXEL and Y_PIXEL 
variable should be added

> If that's feasible, then I wouldn't tie the configuration to WMS 
> explicitly. What about just using TOLERANCE AUTO? I mean, it seems 
> that this is trying to address the limitations of that configuration 
> parameter.

This isn't exclusive of the TOLERANCE value. The TOLERANCE value can be 
used to add an extra buffer around the filled areas of the symbol

so you can have something like:

IDENTIFICATION
         TOLERANCE 5
         CLASSAUTO
END

>
> On Mon, Sep 8, 2025 at 7:36 AM Even Rouault via MapServer-dev 
> <mapserver-dev at lists.osgeo.org> wrote:
>
>     Hi,
>
>     In https://github.com/MapServer/MapServer/pull/7318 I've
>     introduced an
>     enhancement to be able to identify with WMS GetFeatureInfo point
>     features through their symbols, rather than just a square centered
>     around their position. This helps for symbols that are not centered
>     (offset), or whose shape is not square.
>
>     I've extende MapServer syntax to be able to enable that mode, and
>     configure how it works. If you read the PR, you'll see there is a
>     bit of
>     a debate on how to best express that conffiguration. Either through a
>     new IDENTIFICATION block as a child of a LAYER block, or using
>     PROCESSION directive or wms_ METADATA items. Are there thoughts
>     about that?
>
>     Thanks,
>
>     Even
>
>     -- 
>     http://www.spatialys.com
>     My software is free, but my time generally not.
>
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-- 
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