Landsat-8 and Sentinel-2 data for mapping plastic-covered greenhouse farming areas: a study from Dalat City (Lam Dong Province), Vietnam

Plastic-covered greenhouse (PCG) farming has been practiced worldwide, particularly in highland areas, for planting fruits and garden plants. Highland areas in south-central Vietnam have been witnessing an expansion of PCG farming in recent decades. For sustainable management of plastic-covered greenhouse farming areas, a proper and continuous monitoring of their spatial patterns is necessary. In this study, we used spaceborne multispectral imagery (Landsat-8 OLI and Sentinel-2 MSI) for automatic detection and mapping of plastic covered greenhouse farming areas in and surrounding areas of Dalat City in Lam Dong province, south-central Vietnam. Unsupervised (K-Means algorithm) and automatic delineation using spectral indices were applied to the Sentinel-2 and Landsat-8 data for mapping plastic-covered greenhouses in Dalat City and surrounding areas. The results were evaluated using field data; automatic spectral index-based mapping of PCGs using Sentinel-2 and Landsat-8 data was found as robust in terms of the overall accuracy. The overall accuracies of PCG maps derived from Sentinel-2 and Landsat-8 data by applying spectral indices were 90.8% and 88.7%, respectively, and those of unsupervised K-Means classification were estimated as 73.2% and 71.7%, respectively. This study estimated that about 2425 ha of plastic-covered greenhouses existed within in Dalat City in 2020.

     

Extracting urban impervious surfaces from Sentinel-2 and Landsat-8 satellite data for urban planning and environmental management

Environmental Science and Pollution Research - Impervious surface is mainly defined as any surface which water cannot infiltrate the soil. Due to the impact of urban impervious surfaces (UIS) on...     

Empirical research on coordination evaluation and sustainable development mechanism of regional logistics and new-type urbanization: a panel data analysis from 2000 to 2015 for Liaoning Province in China

Environmental Science and Pollution Research - As the largest developing country in the world, China has witnessed fast-paced urbanization over the past three decades with rapid economic growth. In...     

Analyses of technical options for mitigating CO2 emissions from an urban transport system: a case study of Beijing City

This paper aims to extrapolate the energy consumption and environmental emissions data on the urban passenger transport system in Beijing, to assess the cost-effectiveness and emission reduction potential of promising technology options for transport systems, and to identify options with both reduction potential and cost-effectiveness. Furthermore, it identifies major barriers to the adoption of such options in Beijing. The long-range Energy Alternatives Planning model, the least-cost approach and the Analytical Hierarchy model are used for these three purposes, respectively. The results show that the fuel demand in the Beijing urban passenger transport system will increase rapidly in the future, along with travel demand and vehicle stock. For CO₂ mitigation targets, diesel vehicles have both emission reduction potential and cost-effectiveness, followed by mass rapid transport systems. The ranking of barriers is similar for all three technology options, and found to be financial incentive, public awareness, lack of infrastructure, high initial cost and institutional/administrative barriers, in descending order of importance. Lack of financial incentive plays a very important role in the adoption of new technology options.     

基于污水处理厂提标改造需求的难降解工业废水处理工艺改进——以湖南省某城镇污水处理厂为例

以湖南省某城镇污水处理厂一期1.0× 104 m3·d-1提标改造工程项目为案例,针对其进水中工业废水占比高(达80％)、污染物浓度波动大、难降解有机物含量高等特点,在原水解酸化池+AAO+高效沉淀池+纤维转盘滤池工艺的基础上,通过现场中试实验,分析了以臭氧催化氧化+生物活性炭滤池(O3-BAC)作为提标改造主...