Tree map: tree view - draw covid-19 array diagram

Tree Map Tree view , visualization

Pie chart is used to show the proportion of each data in the total , But when the number of data individuals is large , When the scale difference is large , The pie chart cannot be well displayed .  The tree view is a visual way to show the data ratio through the space filling proportion . It can well reflect the evaluation of data ,  Visually display the proportion of data with different properties .

19 Accumulated in countries COVID-19 epidemic situation

end 2020-4-4 Japan 16 when

Illustration :

• tree map The area of the rectangular card shows the COVID-19 condition .

• The size and order of the rectangle are calculated .

• According to the size of the data , The largest rectangle almost occupies a separate area .

• There are many different algorithms for calculating matrix shapes , To reflect different data evaluation perspectives .

The usual way is :

• Treat the largest data as 1, Other data calculate the matrix size through ratio .

• Due to the relatively small amount of other data , Therefore, the data structure can be displayed through such a tree view . The sub matrix graph created , It can also be used as a new subset attribute .

• Color is only used to distinguish different data

Code implementation

1

Data sources

Data sources :

4 month 4 Japan 16 when People's daily new media

2

Data import

Import the sorted data into