Found what I wanted, thought I would share here...
I was checking geocaching.com and their map and came across a reference to
UTFGrid on their source code. Some Google searches after that's exactly
what I was looking for.
Geoserver already supports outputting UTFGrid via WMS (and WMTS as well).
Leaflet and OL already have plugins ready to integrate it into the map. I
built a prototype and it works just perfectly out of the box!
UTFGrid would be a difficult term for me to associate with this feature so
I feel I was lucky since I found this by looking at someone else's source
code. Anyway, happy story.
Cheers,
JD
On Mon, Feb 19, 2018 at 5:46 PM, João Duarte <jddua...@gmail.com> wrote:
> Hi,
>
> I tried searching the archives for this but I might not be using the right
> keywords so here it goes...
>
> I'm using Geoserver to expose a WMS layer containing some point data. I
> can use OL/Leaflet/GMaps to display my tiles and it all works perfectly.
>
> Now I wanted some way to know where point features are inside each tile so
> I could change the mouse cursor when hovering them. I came across an
> implementation of such functionality at http://mapas.sapo.pt. Here's a
> sample request:
>
> http://mapas.sapo.pt/map4.mapas.sapo.pt/wms_mapas?LAYERS=
> MapPOIs&SRS=EPSG%3A900913&FORMAT=application%2Fjson&
> TRANSPARENT=TRUE&PROPERTYNAME=POIId&SERVICE=WMS&VERSION=1.1.
> 1&REQUEST=GetFeatureBounds&STYLES=&BBOX=-1018446.9682783,
> 4681767.9780394,-1017988.3461086,4682226.600209&WIDTH=768&HEIGHT=768
>
>
> <http://mapas.sapo.pt/map4.mapas.sapo.pt/wms_mapas?LAYERS=MapPOIs&SRS=EPSG%3A900913&FORMAT=application%2Fjson&TRANSPARENT=TRUE&PROPERTYNAME=POIId&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetFeatureBounds&STYLES=&BBOX=-1018446.9682783,4681767.9780394,-1017988.3461086,4682226.600209&WIDTH=768&HEIGHT=768>They
> seem to have implemented a custom WMS operation called GetFeatureBounds and
> then have some custom JS on top of OL to listen for mousemove events and
> constantly checking if the cursor is hovering one of the point's bboxes.
>
> I know I could achieve something similar by querying for points via WFS
> and then creating Markers on the frontend code and adding them to the map
> but I believe that for a certain number of points, the other strategy could
> have performance advantages over having lots of DOM elements (representing
> the markers) on the map.
>
> I think there's no solution out-of-the-box but am curious as to if anyone
> ever tried developing something similar? A starting point I think could be
> trying to hack the ImageMap plugin to change it's output to something
> similar to what the above URL gives.
>
> Would be interested in hearing your thoughts on this.
>
> Thank you
>
> --
> JD
>
--
João
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