Visualize two numeric attributes with the Bivariate Renderer
You can visualize numeric fields with any of SpatialKey’s map renderers, which consist of the Heatmap, Heat Grid, and Graduated Circle renderers. The Bivariate Renderer is a more advanced renderer and visualizes two numeric attributes at the same time, instead of just one. The map renderer will show the relationship between the two attributes you specify. To get started you can select “Bivariate Heat Grid” from the list of renderers, just like you would to switch between the Heatmap and Heat Grid renderers.
Once you select the Bivariate Heat Grid you’ll be able to select two numeric attributes. In this example we’ve selected Average Sale Price and Average Square Feet. This will show us the relationship between the price of a home and the size.
The renderer will show the relationship between these attributes in different geographic areas. The tooltip on the map will now show you both statistics when you roll over the geographic areas.
The color on the map is created based on a continuous legend that goes from red to blue. This legend highlights outliers, which will be rendered as brighter shades of red and blue. The legend also shows the distribution of the areas on the map. In this example we can see that most of the areas fall within a fairly linear distribution, which means that price and size of homes are correlated. We can, however, see some areas that fall outside the normal distribution. If an area shows up as red that means that the price is higher than normal for the size of the house. Areas that show up in blue indicate the size is larger than normal based on the price.
Also note that as you mouse over the legend the corresponding geographic area in the map is highlighted so you can clearly see which areas are mapped to the items on the legend.
To see the Bivariate Renderer in action you can watch the video demonstration:
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