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Table 3 Summary of the principal components analysis results by planning zones

From: Investigating important urban characteristics in the formation of urban heat islands: a machine learning approach

Planning zone Principal components Variables % Variance explained
CBD PC 1 Demographic characteristics POP_OV_65, female, NON_WT, mobile 36.7
PC 2 Household level economic status MedHsValue, MEDHHINC 18.0
PC 3 Urban vertical characteristics Height_Avr, Height_Max 11.4
  Total % variance explained = 66.1
Commercial PC 1 Demographic characteristics POP_UR_18, female, TOT_HSUNT 24.8
PC 2 Household level economic status MedHsValue, MEDHHINC 12.6
PC 3 Urban vertical characteristics Height_Avr, Height_Max 11.9
  Total % variance explained = 49.2
Urban dwelling PC 1 Demographic characteristics POP_UR_18, female, TOT_HSUNT 22.7
PC 2 Household level economic status MedHsValue, MEDHHINC 15.8
PC 3 Urban vertical characteristics Height_Avr, Height_Max 11.6
  Total % variance explained = 50.1
Suburban dwelling PC 1 Demographic characteristics POP_UR_18, female, NON_WT, RENT 24.4
PC 2 Urban physical characteristics Imperv, Height_Avr, Height_Max, Bldg_Ftpr 14.5
PC 3 Household level economic status MedHsValue, MEDHHINC 12.5
  Total % variance explained = 51.3
Agricultural dwelling PC 1 Demographic characteristics POP_UR_18, female, TOT_HSUNT 28.0
PC 2 Household level economic status MedHsValue, MEDHHINC 14.1
PC 3 Urban vertical characteristics Height_Avr, Height_Max 12.9
  Total % variance explained = 55.0
Industrial urban PC 1 Demographic characteristics Female, TOT_HSUNT, Rent 25.4
PC 2 Urban biophysical characteristics NDVI, Imperv 16.1
PC 3 Urban vertical characteristics Height_Avr, Height_Max 12.9
  Total % variance explained = 54.4
Industrial suburban PC 1 Demographic characteristics POP_UR_18, female, TOT_HSUNT 30.0
PC 2 Urban vertical characteristics Height_Avr, Height_Max 13.6
PC 3 Household level economic status MedHsValue, MEDHHINC 11.2
  Total % variance explained = 54.8
SE PC 1 Demographic characteristics POP_UR_18, female, TOT_HSUNT 31.6
PC 2 Urban vertical characteristics Height_Avr, Height_Max 13.1
  Total % variance explained = 44.7