S&M Young Researcher Paper Award 2020
Recipients: Ding Jiao, Zao Ni, Jiachou Wang, and Xinxin Li [Winner's comments]
Paper: High Fill Factor Array of Piezoelectric Micromachined
Ultrasonic Transducers with Large Quality Factor

S&M Young Researcher Paper Award 2021
Award Criteria
Notice of retraction
Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
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Dynamic Monitoring of Spatial-temporal Changes of Ecological Environment Quality in Beijing Based on Remote Sensing Ecological Index with Google Earth Engine

Jiaqi Lu, Hongliang Guan, Zhiqiang Yang, and Lei Deng

(Received July 28, 2021; Accepted September 7, 2021)

Keywords: Beijing, remote sensing ecological index, eco-environment quality, spatial-temporal changes, Google Earth Engine

Effective and quantitative monitoring of spatial-temporal changes in eco-environment quality is critical for urban sustainable development and policymaking. In this study, four ecological factors (greenness, wetness, heat, and dryness) of Beijing were obtained by integrating MODIS imagery in each year from 2001 to 2020. Then, a remote sensing ecological index (RSEI), which is employed to assess eco-environment quality, based on the four factors was constructed by using the Google Earth Engine (GEE) platform. Finally, the spatial-temporal changes of RSEI during the 20 years were analyzed. The results show that the eco-environment quality of Beijing improved from 2001 to 2020, with the average RSEI increasing from 0.586 in 2001 to 0.64 in 2020. The eco-environment quality in the mountainous areas of Beijing is better than that in the urban areas. The area seeing a deterioration decreased from 23.46% between 2001 and 2005 to 8.66% between 2015 and 2020, while the area with improved eco-environment quality increased from 13.04% between 2001 and 2005 to 21.64% between 2015 and 2020. We have thus assessed the spatial-temporal changes in eco-environment quality based on RSEI and GEE, which is critical to investigate the interactions between human activities and ecosystem services in Beijing.

Corresponding author: Lei Deng




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