scholarly journals Advances of Local Climate Zone Mapping and Its Practice Using Object-Based Image Analysis

Atmosphere ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1146
Author(s):  
Lei Ma ◽  
Xiaoxiang Zhu ◽  
Chunping Qiu ◽  
Thomas Blaschke ◽  
Manchun Li
Keyword(s):  
Image Analysis ◽  
Urban Heat Islands ◽  
Local Climate ◽  
Heat Islands ◽  
Object Based Image Analysis ◽  
Object Based ◽  
Local Climate Zones ◽  
Urban Heat ◽  
Future Object ◽  
Local Climate Zone

In the context of climate change and urban heat islands, the concept of local climate zones (LCZ) aims for consistent and comparable mapping of urban surface structure and cover across cities. This study provides a timely survey of remote sensing-based applications of LCZ mapping considering the recent increase in publications. We analyze and evaluate several aspects that affect the performance of LCZ mapping, including mapping units/scale, transferability, sample dataset, low accuracy, and classification schemes. Since current LCZ analysis and mapping are based on per-pixel approaches, this study implements an object-based image analysis (OBIA) method and tests it for two cities in Germany using Sentinel 2 data. A comparison with a per-pixel method yields promising results. This study shall serve as a blueprint for future object-based remotely sensed LCZ mapping approaches.

Use of Local Climate Zones to investigate surface urban heat islands in Texas

2020 ◽  
Vol 57 (8) ◽  
pp. 1083-1101 ◽  
Author(s):  
Chunhong Zhao ◽  
Jennifer L. R. Jensen ◽  
Qihao Weng ◽  
Nathan Currit ◽  
Russell Weaver
Keyword(s):  
Urban Heat Islands ◽  
Climate Zones ◽  
Local Climate ◽  
Heat Islands ◽  
Local Climate Zones ◽  
Urban Heat

scholarly journals Local Climate Zones for Urban Temperature Studies

2012 ◽  
Vol 93 (12) ◽  
pp. 1879-1900 ◽  
Author(s):  
I. D. Stewart ◽  
T. R. Oke
Keyword(s):  
Surface Characterization ◽  
Global Climate ◽  
Urban Heat Islands ◽  
Local Climate ◽  
Heat Islands ◽  
Local Climate Zones ◽  
Thermal Climate ◽  
Urban Rural ◽  
Urban Heat

The effect of urban development on local thermal climate is widely documented in scientific literature. Observations of urban–rural air temperature differences—or urban heat islands (UHIs)—have been reported for cities and regions worldwide, often with local field sites that are extremely diverse in their physical and climatological characteristics. These sites are usually described only as “urban” or “rural,” leaving much uncertainty about the actual exposure and land cover of the sites. To address the inadequacies of urban–rural description, the “local climate zone” (LCZ) classification system has been developed. The LCZ system comprises 17 zone types at the local scale (102 to 104 m). Each type is unique in its combination of surface structure, cover, and human activity. Classification of sites into appropriate LCZs requires basic metadata and surface characterization. The zone definitions provide a standard framework for reporting and comparing field sites and their temperature observations. The LCZ system is designed primarily for urban heat island researchers, but it has derivative uses for city planners, landscape ecologists, and global climate change investigators.

scholarly journals Using “Local Climate Zones” to Detect Urban Heat Island on Two Small Cities in Alabama

2018 ◽  
Vol 22 (16) ◽  
pp. 1-22 ◽  
Author(s):  
Jeff Chieppa ◽  
Austin Bush ◽  
Chandana Mitra
Keyword(s):  
Classification System ◽  
Urban Climate ◽  
Urban Heat Islands ◽  
Small Cities ◽  
Local Climate ◽  
Heat Islands ◽  
Hourly Temperature ◽  
Rural Environments ◽  
Local Climate Zones ◽  
Urban Heat

Abstract Classifying “urban” and “rural” environments is a challenge in understanding urban climate, specifically urban heat islands (UHIs). Stewart and Oke developed the “local climate zone” (LCZ) classification system to clarify these distinctions using 17 unique groups. This system has been applied to many areas around the world, but few studies have attempted to utilize them to detect UHI effects in smaller cities. Our aim was to use the LCZ classification system 1) to detect UHI in two small cities in Alabama and 2) to determine whether similar zones experienced similar intensity or magnitude of UHIs. For 1 week, we monitored hourly temperature in two cities, in four zones: compact low-rise, open low-rise, dense forests, and water. We found that urban zones were often warmer for overall, daytime, and nighttime temperatures relative to rural zones (from −0.1° to 2.8°C). In addition, we found that temperatures between cities in similar zones were not very similar, indicating that the LCZ system does not predict UHI intensity equally in places with similar background climates. We found that the LCZ classification system was easy to use, and we recognize its potential as a tool for urban ecologists and urban planners.

scholarly journals Multi-Temporal Effects of Urban Forms and Functions on Urban Heat Islands Based on Local Climate Zone Classification

2019 ◽  
Vol 16 (12) ◽  
pp. 2140 ◽  
Author(s):  
Jinling Quan
Keyword(s):  
Time Scales ◽  
Land Surface ◽  
Urban Heat Islands ◽  
Climate Zone ◽  
Local Climate ◽  
Urban Forms ◽  
Heat Islands ◽  
Multi Temporal ◽  
Urban Heat ◽  
Local Climate Zone

Urban forms and functions have critical impacts on urban heat islands (UHIs). The concept of a “local climate zone” (LCZ) provides a standard and objective protocol for characterizing urban forms and functions, which has been used to link urban settings with UHIs. However, only a few structure types and surface cover properties are included under the same climate background or only one or two time scales are considered with a high spatial resolution. This study assesses multi-temporal land surface temperature (LST) characteristics across 18 different LCZ types in Beijing, China, from July 2017 to June 2018. A geographic information system-based method is employed to classify LCZs based on five morphological and coverage indicators derived from a city street map and Landsat images, and a spatiotemporal fusion model is adopted to generate hourly 100-m LSTs by blending Landsat, Moderate Resolution Imaging Spectroradiometer (MODIS), and FengYun-2F LSTs. Then, annual and diurnal cycle parameters and heat island and cool island (HI or CI) frequency are linked to LCZs at annual, seasonal, monthly, and diurnal scales. Results indicate that: (1) the warmest zones are compact and mid and low-rise built-up areas, while the coolest zones are water and vegetated types; (2) compact and open high-rise built-up areas and vegetated types have seasonal thermal patterns but with different causes; (3) diurnal temperature ranges are the highest for compact and large low-rise settings but the lowest for water and dense or scattered trees; and (4) HIs are the most frequent summertime and daytime events, while CIs occur primarily during winter days, making them more or less frequent for open or compact and high- or low-rise built-up areas. Overall, the distinguishable LSTs or UHIs between LCZs are closely associated with the structure and coverage properties. Factors such as geolocation, climate, and layout also interfere with the thermal behavior. This study provides comprehensive information on how different urban forms and functions are related to LST variations at different time scales, which supports urban thermal regulation through urban design.

Evaluation of urban heat islands using local climate zones and the influence of sea-land breeze

2020 ◽  
Vol 55 ◽  
pp. 102060 ◽  
Author(s):  
Xilin Zhou ◽  
Tsubasa Okaze ◽  
Chao Ren ◽  
Meng Cai ◽  
Yasuyuki Ishida ◽  
...  
Keyword(s):  
Urban Heat Islands ◽  
Land Breeze ◽  
Climate Zones ◽  
Local Climate ◽  
Heat Islands ◽  
Local Climate Zones ◽  
Urban Heat

scholarly journals Urban heat island analysis using the ‘local climate zone’ scheme in Presidente Prudente, Brazil

2018 ◽  
pp. 107 ◽  
Author(s):  
Renata dos Santos Cardoso ◽  
Margarete Cristiane de Costa Trindade Amorim
Keyword(s):  
Urban Morphology ◽  
Urban Heat Islands ◽  
Climate Zone ◽  
Local Climate ◽  
Heat Islands ◽  
Rural Landscapes ◽  
Recent Climate ◽  
Urban Heat ◽  
Mobile Measurements ◽  
Local Climate Zone

Although urban heat islands (UHIs) have been widely studied, a recent climate-based classification of urban and rural landscapes provides a new framework for UHI researchers. Based on the Local Climate Zone (LCZ) system, we studied heat islands in a tropical city, analysing the effects of urban morphology and surface cover on UHI intensity. Mobile measurements were taken in Presidente Prudente, São Paulo, Brazil, on five winter evenings (June and July 2014). Observed temperatures across the city show compact built zones with higher temperatures, followed by open midsize, lightweight low-rise, and low plants zones. A maximum nocturnal temperature difference of more than 5°C was detected between areas with significant differences in physical characteristics (ΔT LCZ 24–D), whereas average inter-zone thermal differences reached 3.8ºC (ΔT LCZ 3–D).

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