O que é um mapa coroplético?

Visualizando dados geoespaciais em Python

Mary van Valkenburg

Data Science Program Manager, Nashville Software School

Definição de mapa coroplético

coroplético da idade média de residentes por LSOAs em Milton Keynes

coroplético do PIB per capita PPP mundial

Densidade

schools_in_districts.head(2)

district  geometry                  name               lat    lng
1         (POLYGON ((-86.77 36.38... Nashville Prep    36.16 -86.85
1         (POLYGON ((-86.77 36.38... Rocketship Prep   36.17 -86.79

Obter contagens

school_counts = schools_in_districts.groupby(['district']).size()
print(school_counts)

district
1    30
2    11
3    19
4    18
5    36
6    21
7    13
8    10
9    12
dtype: int64

Adicionar contagens

school_counts_df = school_counts.to_frame()
school_counts_df = school_counts_df.reset_index()
school_counts_df.columns = ['district', 'school_count']

districts_with_counts = pd.merge(school_districts, school_counts_df, 
                                 on = 'district')
districts_with_counts.head(2)

district geometry           school_count
1        (POLYGON ((-86.77 36.38...  30
3        (POLYGON ((-86.75 36.40...  19

Dividir contagens por áreas

districts_with_counts['area'] = districts_with_counts.area

districts_with_counts['school_density'] = districts_with_counts.apply(
    lambda row: row.school_count/row.area, axis = 1)

districts_with_counts.head(2)

district geometry           school_count   area    school_density
1        (POLYGON ((-86.77 36.38...    30    0.036641    818.745403
3        (POLYGON ((-86.75 36.40...    19    0.014205    1337.594495

Vamos praticar!

Visualizando dados geoespaciais em Python