Global Annual PM2.5 Grids from MODIS, MISR and SeaWiFS Aerosol Optical Depth (AOD), 1998-2019, V4.GL.03

NOTICE: The NASA Earthdata GIS will undergo an update beginning on 8/31/26. During this time, the service will be unavailable and/or not updated. As part of this update, service endpoints will be changed. We apologize for any inconvenience. Abstract and Limitations of Use: The Global Annual PM2.5 Grids from MODIS, MISR and SeaWiFS Aerosol Optical Depth (AOD), 1998-2019, V4.GL.03 consists of annual concentrations (micrograms per cubic meter) of all composition ground-level fine particulate matter (PM2.5). This data set combines AOD retrievals from multiple satellite algorithms including the NASA MODerate resolution Imaging Spectroradiometer Collection 6.1 (MODIS C6.1), Multi-angle Imaging SpectroRadiometer Version 23 (MISRv23), MODIS Multi-Angle Implementation of Atmospheric Correction Collection 6 (MAIAC C6), and the Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) Deep Blue Version 4. The GEOS-Chem chemical transport model is used to relate this total column measure of aerosol to near-surface PM2.5 concentration. Geographically Weighted Regression (GWR) is used with global ground-based measurements from the World Health Organization (WHO) database to predict and adjust for the residual PM2.5 bias per grid cell in the initial satellite-derived values. These estimates are primarily intended to aid in large-scale studies. Gridded data sets are provided at a resolution of 0.01 degrees to allow users to agglomerate data as best meets their particular needs. Data sets are gridded at the finest resolution of the information sources that were incorporated, but do not fully resolve PM2.5 gradients at the gridded resolution due to influence by information sources at coarser resolution. The data are distributed as GeoTIFF files and are in WGS84 projection. Because this is a historical dataset, this item does not follow a routine update frequency. Intended Use: To provide an annual global surface of concentrations (micrograms per cubic meter) of all composition ground-level fine particulate matter of 2.5 micrometers or smaller (PM2.5) for large-scale health and environmental research. Legend: Color Legend Label Description: 80 - 139 Annual concentrations (micrograms per cubic meter) of all composition ground-level fine particulate matter (PM2.5) 40 - 80 20 - 40 10 - 20 5 - 10 0 - 5 Citation: Global Annual PM2.5 Grids from MODIS, MISR and SeaWiFS Aerosol Optical Depth (AOD), 1998-2019, V4.GL.03. Hammer, M. S., A. van Donkelaar, C. Li, A. Lyapustin, A. M. Sayer, N. C. Hsu, R. C. Levy, M. J. Garay, O. V. Kalashnikova, R. A. Kahn, M. Brauer, J. S. Apte, D. K. Henze, L. Zhang, Q. Zhang, B. Ford, J. R. Pierce, and R. V. Martin. (2022). NASA Socioeconomic Data and Applications Center (SEDAC). DOI: https://doi.org/10.7927/fx80-4n39 For inquiries about this service, please contact [e-mail]. Publication References: Documentation for the Global Annual PM2.5 Grids from MODIS, MISR and SeaWiFS Aerosol Optical Depth (AOD), 1998-2019, V4.GL.03. Hammer, M. S., A. van Donkelaar, C. Li, A. Lyapustin, A. M. Sayer, N. C. Hsu, R. C. Levy, M. J. Garay, O. V. Kalashnikova, R. A. Kahn, M. Brauer, J. S. Apte, D. K. Henze, L. Zhang, Q. Zhang, B. Ford, J. R. Pierce, and R. V. Martin. (2022). NASA Socioeconomic Data and Applications Center (SEDAC). DOI: https://doi.org/10.7927/thr9-xe64注意事项：美国国家航空航天局（National Aeronautics and Space Administration, NASA）地球数据地理信息系统（Geographic Information System, GIS）将于2026年8月31日起进行升级。在此期间，服务将无法正常使用且/或无法更新。本次升级将变更服务端点。对此给您带来的不便，我们深表歉意。 摘要与使用限制：1998-2019年V4.GL.03版本的、基于中分辨率成像光谱仪（MODerate resolution Imaging Spectroradiometer, MODIS）、多角度成像光谱辐射计（Multi-angle Imaging SpectroRadiometer, MISR）与宽视场海洋观测传感器（Sea-Viewing Wide Field-of-View Sensor, SeaWiFS）气溶胶光学厚度（Aerosol Optical Depth, AOD）的全球年度PM2.5格点数据集，包含所有组分的近地面细颗粒物（PM2.5，直径≤2.5微米）的年度浓度（单位：微克/立方米）。本数据集整合了多颗卫星的气溶胶光学厚度反演结果，包括NASA中分辨率成像光谱仪6.1版数据集（MODIS C6.1）、多角度成像光谱辐射计23版（MISRv23）、MODIS大气校正多角度实现方案6版数据集（MAIAC C6），以及宽视场海洋观测传感器（SeaWiFS）深蓝算法4版数据。研究团队采用GEOS-Chem化学传输模型，将气溶胶整柱含量反演结果关联至近地面PM2.5浓度；同时结合世界卫生组织（World Health Organization, WHO）数据库的全球地面实测数据，通过地理加权回归（Geographically Weighted Regression, GWR）对初始卫星反演结果中每个格点的残余PM2.5偏差进行预测与校正。 本数据集主要用于支撑大尺度相关研究。格点数据以0.01度的分辨率提供，方便用户根据自身研究需求对数据进行聚合处理。数据集采用纳入的数据源中最高分辨率进行格点化，但由于低分辨率数据源的影响，无法完全在当前格点分辨率下还原PM2.5的浓度梯度。数据以GeoTIFF格式分发，投影采用WGS84坐标系。由于本数据集为历史数据集，因此不遵循常规更新频率。 适用场景：为大尺度健康与环境研究提供1998-2019年全球年度近地面细颗粒物（PM2.5，直径≤2.5微米）浓度的地表分布数据（单位：微克/立方米）。 图例：颜色图例标签说明： 80 - 139：所有组分的近地面细颗粒物（PM2.5）年度浓度（单位：微克/立方米） 40 - 80 20 - 40 10 - 20 5 - 10 0 - 5 引用格式：1998-2019年V4.GL.03版本的、基于MODIS、MISR与SeaWiFS气溶胶光学厚度（AOD）的全球年度PM2.5格点数据集。作者：Hammer, M. S., A. van Donkelaar, C. Li, A. Lyapustin, A. M. Sayer, N. C. Hsu, R. C. Levy, M. J. Garay, O. V. Kalashnikova, R. A. Kahn, M. Brauer, J. S. Apte, D. K. Henze, L. Zhang, Q. Zhang, B. Ford, J. R. Pierce 与 R. V. Martin。发布时间：2022年。数据来源：NASA社会经济数据与应用中心（Socioeconomic Data and Applications Center, SEDAC）。数字对象标识符（Digital Object Identifier, DOI）：https://doi.org/10.7927/fx80-4n39 如需咨询该服务相关问题，请发送邮件至[e-mail]。 发表参考文献：1998-2019年V4.GL.03版本的、基于MODIS、MISR与SeaWiFS气溶胶光学厚度（AOD）的全球年度PM2.5格点数据集说明文档。作者：Hammer, M. S., A. van Donkelaar, C. Li, A. Lyapustin, A. M. Sayer, N. C. Hsu, R. C. Levy, M. J. Garay, O. V. Kalashnikova, R. A. Kahn, M. Brauer, J. S. Apte, D. K. Henze, L. Zhang, Q. Zhang, B. Ford, J. R. Pierce 与 R. V. Martin。发布时间：2022年。数据来源：NASA社会经济数据与应用中心（SEDAC）。数字对象标识符（DOI）：https://doi.org/10.7927/thr9-xe64