Add Esri Heatmap Feature Layer.
addEsriHeatmapFeatureLayer(map, url, radius = 25, gradient = NULL,
options = featureLayerOptions(), layerId = NULL, group = NULL)
The leaflet map
url of the FeatureService or MapService.
Radius for the heatmap
The gradient
options for the featurelayer
A unique ID for the layer.
The name of the group this layer should be added to.
the same parameter under addTiles
)