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Urban Heat Island (UHI) Analysis

Max Anjos

November 19, 2024

Source: vignettes/local_func_uhi.Rmd
local_func_uhi.Rmd

Introduction

The lcz_uhi_intensity() function is designed to calculate the Urban Heat Island (UHI) intensity based on air temperature measurements and Local Climate Zones (LCZ).

This guide demonstrates how to use the lcz_uhi_intensity() function to calculate and analyze UHI intensity using LCZ classes. The function supports two calculation methods:

    1. LCZ Method: Automatically identifies the LCZ build types, starting from LCZ 1 and progressing to LCZ 10, to represent the urban temperature, whilst it starts from LCZ natural LCZ (11-16) to represent the rural temperature
    1. Manual Method: Allows users have the freedom to select stations as references for the urban and rural areas.
# Get the LCZ map for your city
lcz_map <- lcz_get_map_euro(city="Berlin")

# Load sample data from LCZ4r
data("lcz_data")

UHI time series 


#Calculate hourly UHI intensity by months of 2019
lcz_uhi_intensity(lcz_map, data_frame = lcz_data, 
       var = "airT", station_id = "station",
       time.freq = "hour", 
       method = "LCZ",
       year = 2019,
       by = "month")

UHI seasonality 


#Calculate hourly UHI intensity by season of 2019, including the urban and rural temperatures
lcz_uhi_intensity(lcz_map, data_frame = lcz_data, 
       var = "airT", station_id = "station",
       time.freq = "hour", 
       method = "LCZ",
       year = 2019,
       by = "season",
       group = TRUE)

UHI daytime and nighttime 


#Calculate diurnal cycle of UHI intensity
lcz_uhi_intensity(lcz_map, data_frame = lcz_data, 
       var = "airT", station_id = "station",
       time.freq = "hour", 
       method = "LCZ",
       year = 2019, month = 2, day = 6,
       by = "daylight",
       group = TRUE)

Using the manual method to calculate the UHI intensity


#Calculate diurnal cycle of UHI intensity by Feb and Jul of 2019 using the manual method
lcz_uhi_intensity(lcz_map, data_frame = lcz_data, 
       var = "airT", station_id = "station",
       time.freq = "hour", 
       year = 2019, month = c(2, 7), day = 6,
       method = "manual",
       Turban = "bamberger",
       Trural = "airporttxl",
       by = c("daylight", "month"),
       group = TRUE)

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