Geoserver heatmap not rendered correctly - google-maps

Question

I am displaying a heatmap generated with geoserver on my google map.
It work pretty fine but the heatmap is tiled, even if the call to the wms is specifically "tiled=false".
Geoserver doc say "Rendering transformations may not work correctly in tiled mode, unless they have been specifically written to accomodate it."
The style to create heatmap in geoserver is copied from https://docs.geoserver.org/stable/en/user/styling/sld/extensions/rendering-transform.html#heatmap-generation
The overlap in my js script is something like
var url = "http://localhost:8080/geoserver/test/wms?";
url += "&service=WMS"; //WMS service
url += "&version=1.1.0"; //WMS version
url += "&request=GetMap"; //WMS operation
url += "&layers=test%3Aglobal_points"; //WMS layers to draw
url += "&styles=heatmap"; //use default style
url += "&format=image/png"; //image format
url += "&TRANSPARENT=TRUE"; //only draw areas where we have data
url += "&srs=EPSG:4326"; //projection WGS84
url += "&bbox=" + bbox; //set bounding box for tile
url += "&width=256"; //tile size used by google
url += "&height=256";
url += "&tiled=false";
So, there's a way to fix it?

Answer 1

You are requesting tiles:
url += "&bbox=" + bbox; //set bounding box for tile
url += "&width=256"; //tile size used by google
url += "&height=256";
even if you set tiled=false - make a request for the whole map and with width and height set to the size of the window.
Even then your heat map will change on each move of the map as more or less points come into view, if you must use a heat map then calculate it once for the whole data set and serve it as a raster layer.
Here is your obligatory XKCD on heatmaps: