40-Year (1978–2017) human settlement changes in China reflected by impervious surfaces from satellite remote sensing

Gong, Peng; Li, Xuecao; Zhang, Wei

doi:10.1016/j.scib.2019.04.024

Cited by 381 publications

(224 citation statements)

References 39 publications

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“…Marked differences were also detected among the numerical experiments, in which model resolution is an important issue when exploring the impacts of urban surface expansion. Although urbanisation in China has occurred rapidly in the past several decades, the urban areas accounted for only 2% of the total area of the country in 2017 (Gong et al, 2019). Therefore, the urban surface distribution and its expansion cannot be reproduced at a coarse resolution, such as 30 km (the urban area occupied by a city is usually less than 900 km 2 ).…”

Section: Discussionmentioning

confidence: 99%

Changes in daily and cumulative volumetric rainfall at various intensity levels due to urban surface expansion over China

Zhao

Zha

2020

Tellus A: Dynamic Meteorology and Oceanography

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Urban surface expansion affects land-atmosphere interactions as well as rainfall. Both the subregional areaaveraged daily (DRAIN) and the subregional cumulative volumetric (VRAIN) rainfall amounts are important in this context for hydrological applications and management. Conducted at the city (Beijing, Shanghai, and Guangzhou), city cluster (Beijing-Tianjin-Hebei (BTH), the Yangtze River Delta (YRD), and the Pearl River Delta (PRD)), and national levels in China, numerical experiments were performed in this study using a regional climate model. The analysis revealed that urban-related changes in rainfall variability were more distinct for stronger rainfall among rainfalls of various intensity levels whereas changes in rainfall intensity were more pronounced for weaker rainfall. Furthermore, urban-induced changes in heavy storm rain were more prominent among rainfalls of various intensity levels, for which changes in the variability in DRAIN and VRAIN were more distinct than changes in their intensities, and exhibited marked subregional characteristics. The risk of heavy storm rain increased because of strengthened urban-induced DRAIN and VRAIN variability over Beijing, and urban areas of the YRD and China. However, the risk of heavy storm rain decreased because of decreased DRAIN and VRAIN variability and the reduced intensity of DRAIN over urban areas of Shanghai, nonurban areas of BTH, and nonurban and the entire areas of Guangzhou, the YRD, and the PRD. The urban-induced drying tendency in the lower troposphere and wetting tendency in the low-middle troposphere, and enhanced vertical motions played an important role in determining the changes in DRAIN and VRAIN in case of storm rain and heavy storm rain.

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Section: Discussionmentioning

confidence: 99%

Changes in daily and cumulative volumetric rainfall at various intensity levels due to urban surface expansion over China

Zhao

Zha

2020

Tellus A: Dynamic Meteorology and Oceanography

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“…It can be seen that the object-oriented method avoided the "salt-and-pepper" problem and ensured the connectivity of the road. It is generally believed that the conversion from urban land to other land cover types rarely occurs [34][35][36]. Therefore, if a certain land parcel was classified as urban land from 2010 to 2014, it is unlikely to have been converted to other land use types in 2016.…”

Section: Training Sample Selectionmentioning

confidence: 99%

Using Multi-Sensor Satellite Images and Auxiliary Data in Updating and Assessing the Accuracies of Urban Land Products in Different Landscape Patterns

et al. 2019

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Rapid and accurate updating of urban land areas is of great significance to the study of environmental changes. Although there are many urban land products (ULPs) at present, such as GlobeLand30, Global Urban Footprint (GUF), and Global Human Settlement Layer (GHSL), these products are all static data of a certain year, and are not able to provide high-accuracy updating of urban land areas. In addition, the accuracies of these data and their application value in the update of urban land areas need to be urgently proven. Therefore, we proposed an approach to quickly and accurately update urban land areas in the Kuala Lumpur region of Malaysia, and assessed the accuracies of urban land products in different urban landscape patterns. The approach combined the advantages of multi-source data including existing ULPs, OpenStreetMap (OSM) data, Landsat Operational Land Imager (OLI), and Phased Array type L-band Synthetic Aperture Radar (PALSAR) images. Three main steps make up this approach. First, the urban land training samples were selected in the urban areas consistent with GlobeLand30, GUF, and GHSL, and samples of bare land, vegetation, water bodies, and road auxiliary data were obtained by GlobeLand30 and OSM. Then, the random forest was used to extract urban land areas according to the object's features in the OLI and PALSAR images. Last, we assessed the accuracies of GlobeLand30, GUF, GHSL, and the results of this study (ULC) by using point and area validation methods. The results showed that the ULC had the highest overall accuracy of 90.18% among the four products and could accurately depict urban land in different urban landscapes. The GHSL was the second most accurate of the four products, and the accuracy in urban areas was much higher than that in rural areas. The GUF had many omission errors in urban land areas and could not delineate a large area of complete spatial information of urban land, but it could effectively extract scattered residential land with small patches. GlobeLand30 had the lowest accuracy and could only express rough, large-scale urban land. The above conclusions provide evidence that ULPs and the approach proposed in this study have a great application potential for high-accuracy updating of urban land areas.

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“…Impervious surfaces are mainly artificial structures that have zero porosity and impede or prevent the natural infiltration of water [1]. In urban areas where human activity is intense, the impervious fraction of land surface is relatively large.…”

Section: Introductionmentioning

confidence: 99%

“…In urban areas where human activity is intense, the impervious fraction of land surface is relatively large. With rapid urbanization [2], impervious surfaces are expanded substantially [1,[3][4][5], and should be considered in meso-scale or local-scale numerical models.…”

Section: Introductionmentioning

confidence: 99%

Variational Assimilation of the Impervious Surfaces Temperature

Meng

2020

Atmosphere

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Impervious surface temperature is a key parameter in impervious surface energy balance. Urban canopy models are now widely used to simulate impervious surface temperatures, but the physical assimilation method for the urban canopy model is still under development and the use of high temporal resolution observation data are limited. In this paper, a physical assimilation method was used to improve the simulation of the impervious surface temperature for the first time. A variational assimilation method was developed and coupled with the integrated urban land model, using the impervious surface energy balance equation as the adjoint physical constraint. The results showed that when the observed impervious surface temperature data of every timestep were assimilated into the integrated urban land model, the bias of the impervious surface temperature was reduced about 86 %. For the operational run, the observed data were assimilated twice per day, and the bias of the impervious surface temperature was reduced by about 78%.

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40-Year (1978–2017) human settlement changes in China reflected by impervious surfaces from satellite remote sensing

Cited by 381 publications

References 39 publications

Changes in daily and cumulative volumetric rainfall at various intensity levels due to urban surface expansion over China

Changes in daily and cumulative volumetric rainfall at various intensity levels due to urban surface expansion over China

Using Multi-Sensor Satellite Images and Auxiliary Data in Updating and Assessing the Accuracies of Urban Land Products in Different Landscape Patterns

Variational Assimilation of the Impervious Surfaces Temperature

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