This property holds a boolean value defining whether to paint assumed values in regions where no data is available. This is especially useful for value maps which are generated from a small data sets as tiles with no available data will be filled with the next available average value in the data set.

This property holds a numeric value defining the resolution reduction when producing tiles. If the coarseness is set to 0 tiles will be produced in the original resolution. A coarseness of 1 allows the renderer to render tiles at half the size and then scale the output, a coarseness of 2 allows the renderer to create tiles at a size of a quarter of the original tile size. Increasing the number dramatically increases performance but also reduces visual quality, especially when using posterization (non-interpolated colors). Values may range between 0 and 3.

This property holds an object that conforms to the interface nokia.maps.heatmap.Overlay.Colors and is used to define the colors of the heat map. The property is optional. If it is not provided, the following default color definition is used:

{
  stops: {
    "0": "#008",	// dark blue
    "0.2": "#0b0",	// medium green
    "0.5": "#ff0",	// yellow
    "0.7": "#f00"	// red
  },
  interpolate: true
}

This means that the highest "heat" value is displayed in opaque red, the lowest as opaque blue, while values in between are shown in opaque green and yellow and interpolation is used to determine them.

This property holds the opacity of the heat map overlay. Values may range from 0+ to 1, inclusive. The property is optional.

This property holds a numeric value defining the number of sampling iterations the heat map renderer will perform on the data set. Each iteration will sample the data more finely. Higher values will create more detailed maps but also cost performance. Values may range between 1 and 8.

This property specifies the type of the heat map to be generated. The property is optional.

The possible values are:

• "density"
• "value"