PM 2.5 mapping using integrated geographically temporally weighted regression (GTWR) and random sample consensus (RANSAC) models

Hone-Jay Chu, Muhammad Bilal

研究成果: Article

摘要

An uncertainty in the relationship between aerosol optical depth (AOD) and fine particulate matter (PM 2.5 ) comes from the uncertainty of AOD by aerosol models and the estimated surface reflectance, a mismatch in spatiotemporal resolution, integration of AOD and PM 2.5 data, and data modeling. In this study, an integrated geographically temporally weighted regression (GTWR) and RANdom SAmple Consensus (RANSAC) models, which provide fine goodness-of-fit between observed PM 2.5 and AOD data, were used for mapping of PM 2.5 over Taiwan for the year 2014. For this, dark target (DT) AOD observations at 3-km resolution (DT 3K ) only for high-quality assurance flag (QA = 3) were obtained from the scientific data set (SDS) “Optical_Depth_Land_And_Ocean”. AOD observations were also obtained from the merged DT and DB (deep blue) product (DTB 3K ) which was generated using the simplified merge scheme (SMS), i.e., using an average of the DT and DB highest quality AOD retrievals or the available one. The GTWR model integrated with RANSAC can use the effective sampling and fitting to overcome the estimation problem of AOD-PM 2.5 with the uncertainty and outliers of observation data. Results showed that the model dealing with spatiotemporal heterogeneity and uncertainty is a powerful tool to infer patterns of PM 2.5 from a RANSAC subset samples. Moreover, spatial variability and hotspot analysis were applied after PM 2.5 mapping. The hotspot and spatial variability of PM 2.5 maps can give us a summary of the spatiotemporal patterns of PM 2.5 variations.

原文English
頁(從 - 到)1902-1910
頁數9
期刊Environmental Science and Pollution Research
26
發行號2
DOIs
出版狀態Published - 2019 一月 21

指紋

Aerosols
optical depth
aerosol
Uncertainty
Spatial Regression
Particulate Matter
surface reflectance
outlier
Quality assurance
Taiwan
Oceans and Seas
Data structures
particulate matter
Observation
Sampling
sampling
ocean

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis

引用此文

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AB - An uncertainty in the relationship between aerosol optical depth (AOD) and fine particulate matter (PM 2.5 ) comes from the uncertainty of AOD by aerosol models and the estimated surface reflectance, a mismatch in spatiotemporal resolution, integration of AOD and PM 2.5 data, and data modeling. In this study, an integrated geographically temporally weighted regression (GTWR) and RANdom SAmple Consensus (RANSAC) models, which provide fine goodness-of-fit between observed PM 2.5 and AOD data, were used for mapping of PM 2.5 over Taiwan for the year 2014. For this, dark target (DT) AOD observations at 3-km resolution (DT 3K ) only for high-quality assurance flag (QA = 3) were obtained from the scientific data set (SDS) “Optical_Depth_Land_And_Ocean”. AOD observations were also obtained from the merged DT and DB (deep blue) product (DTB 3K ) which was generated using the simplified merge scheme (SMS), i.e., using an average of the DT and DB highest quality AOD retrievals or the available one. The GTWR model integrated with RANSAC can use the effective sampling and fitting to overcome the estimation problem of AOD-PM 2.5 with the uncertainty and outliers of observation data. Results showed that the model dealing with spatiotemporal heterogeneity and uncertainty is a powerful tool to infer patterns of PM 2.5 from a RANSAC subset samples. Moreover, spatial variability and hotspot analysis were applied after PM 2.5 mapping. The hotspot and spatial variability of PM 2.5 maps can give us a summary of the spatiotemporal patterns of PM 2.5 variations.

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