How to create a Point Map?
What is Point Map?
Point maps plot geographic latitude/longitude data to visualize the location of data on a map. The point is identified by either a value or a subject.
Follow the example below to learn how to set up a Point map.
For demonstration purposes, we will try to visualize the listings of Airbnb homestays in Asheville (North Carolina, USA). We will use real data published by Airbnb here.
We have already cleaned the data and uploaded them to a public Google Sheet link.
You can import the file from the Google Sheet link using the Data Import feature. Instruction here.
Creating a point map
To create a point map, select the Point map icon from the visualization pane
In the Viz settings, drag/type your
longtitude to Latitude and Longitude fields respectively.
If you click on Get results now, Holistics will display a plain one-color-map that has equal-sized bubbles.
To add some statistical meaning to our map, we add
Price to the Value field. Then click Get results. There are two things we observe here:
- Our bubble size changes. The greater the value it carries, the bigger it is.
- The color of each bubble changes. The greater the value it carriers, the “greener” it is.
By adding a measure to the value field, Holistics will change both the size and color of the bubbles according to the value they carry.
Our map has some meanings now, but it still doesn’t look good. Let’s go to tab Styles and edit our map with the following options:
- Color scale layout: Change how the color scale is positioned vertical or horizontal
- Map background: You have 5 options to choose from: Light, Dark, Street, Satellite, Outdoor.
- Point size: You have 10 options from 1 to 10 to change the point size in the map.
- Size scale: Change how the data is calculated (Linear or Logarithmic)
Also, we can change how the bubbles are colored by using Color Formatting.
- Set color by…: Select a field to color your map. After you have selected a field, the following options will appear.
- Style: Click on the color scale to change the color style of the map. Choose Smooth to generate a color gradient for both the map and the scale. Choosing Steps to explicitly divide the color scale into color blocks, each of which will contain a range of values. For example, if our data ranges from 0-100, and we set 5 steps, there will be 5 corresponding blocks of color: 0-20, 20-40…
- Min - Mid - Max: by default, these fields’ values will be set to Auto. However, you can select from the drop-down list to the left of the input field to change to Number or Percent. Then, you can type your own data and the changes will be applied immediately to the color scale in Style.
Note: If your input data in min, max is out of range (i.e. your data range is 1-100 but you input 101 in min), Holistics will choose the max color as the displaying color. If your input data in mid is out of range (i.e. you put 1000 in mid), Holistics will not make any change to the color scale.
With a little bit of tweaking around, here’s our final point map
Creating a Heat map
The Heat map is actually Point Map but points on the map are not visualized by concrete circles, but rather areas of color. The color reflects the concentration of data clusters in a given area.
The new Heat map will be coming soon! In the meantime, you can learn how to create our current Heat map.