Yingxi Shi

Yingxi Shi


Research Focus & Metrics

Academic Career Length

6Years (2021-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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28 January 2021 in Remote Sensing
Verified
Journal Article
Open access
PDF file
JLJangho Lee
Jangho Lee
YSYingxi Shi
Yingxi Shi
Changjie CaiChangjie Cai
Changjie Cai
Pubu CirenPubu Ciren
Pubu Ciren
JWJianwu Wang
Jianwu Wang
ZZZhibo Zhang
Zhibo Zhang
Identifying dust aerosols from passive satellite images is of great interest for many applications. In this study, we developed five different machine-learning (ML) based algorithms, including Logistic Regression, K Nearest Neighbor, Random Forest (RF), Feed Forward Neural Network (FFNN), and Convolutional Neural Network (CNN), to identify dust aerosols in the daytime satellite images from the Visible Infrared Imaging Radiometer Suite (VIIRS) under cloud-free conditions on a global scale. In order to train the ML algorithms, we collocated the state-of-the-art dust detection product from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) with the VIIRS observations along the CALIOP track. The 16 VIIRS M-band observations with the center wavelength ranging from deep blue to thermal infrared, together with solar-viewing geometries and pixel time and locations, are used as the predictor variables. Four different sets of training input data are constructed based on different combinations of VIIRS pixel and predictor variables. The validation and comparison results based on the collocated CALIOP data indicate that the FFNN method based on all available predictor variables is the best performing one among all methods. It has an averaged dust detection accuracy of about 81%, 89%, and 85% over land, ocean and whole globe, respectively, compared with collocated CALIOP. When applied to off-track VIIRS pixels, the FFNN method retrieves geographical distributions of dust that are in good agreement with on-track results as well as CALIOP statistics. For further evaluation, we compared our results based on the ML algorithms to NOAA’s Aerosol Detection Product (ADP), which is a product that classifies dust, smoke, and ash using physical-based methods. The comparison reveals both similarity and differences. Overall, this study demonstrates the great potential of ML methods for dust detection and proves that these methods can be trained on the CALIOP track and then applied to the whole granule of VIIRS granule.

28 September 2023
Verified
Book Chapter
Closed access
PDF file
RLRobert Levy
Robert Levy
LRLorraine A. Remer
Lorraine A. Remer
YSYingxi Shi
Yingxi Shi
RKRichard G. Kleidman
Richard G. Kleidman
TTThe Dark Target Team
The Dark Target Team

29 November 2022
Verified
Book Chapter
Closed access
PDF file
RLRobert Levy
Robert Levy
LRLorraine A. Remer
Lorraine A. Remer
YSYingxi Shi
Yingxi Shi
RKRichard G. Kleidman
Richard G. Kleidman
TTThe Dark Target Team
The Dark Target Team