Validation of MODIS AOD products with 1-km resolution and their application in the study of urban air pollution in Hong Kong

Chengcai Li; Alexis Kai-Hon Lau; Jietai Mao

doi:10.1117/12.561404

15 September 2004 Validation of MODIS AOD products with 1-km resolution and their application in the study of urban air pollution in Hong Kong

Chengcai Li, Alexis Kai-Hon Lau, Jietai Mao

Author Affiliations +

Proceedings Volume 5547, Remote Sensing in Atmospheric Pollution Monitoring and Control; (2004) https://doi.org/10.1117/12.561404
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

Remote sensing products of aerosol from MODIS have been released by NASA for a long time, and the Level 2 products showed to be very useful in monitoring regional aerosol pollution pattern and tracing pollutant transports. However, for a city, with an area of several hundreds square-kilometers and complicated terrain, the products with 10 km resolution are not enough especially in depicting the detail particulate matter (PM) distribution in the urban area. Recently, the aerosol optical depth (AOD) retrieval method proposed by NASA has been used to obtain the 1km resolution products in Hong Kong. Aerosol model was improved by sun-photometer observations and the calculation of a radiation transfer model, and finally looking up tables were created for real time aerosol products retrieval. The AOD products were validated by the sun-photometer observations at the HKUST. It was found the relative bias between the satellite products and the ground observations was within the range of about 20%, which was mostly equal to the estimation of NASA for their 10km level 2 products in most AERONET sites. The good results are mainly because of the most regions of Hong Kong are covered by dense dark vegetations (DDV) with very low surface reflectance in visual and near-infrared satellite channels. This high-resolution product was used in the study of air pollution in Hong Kong, and it was found the 1km products were more useful to describe the local urban PM pollutant distribution than the 10 km Level 2 products.

Citation Download Citation

Chengcai Li, Alexis Kai-Hon Lau, and Jietai Mao "Validation of MODIS AOD products with 1-km resolution and their application in the study of urban air pollution in Hong Kong", Proc. SPIE 5547, Remote Sensing in Atmospheric Pollution Monitoring and Control, (15 September 2004); https://doi.org/10.1117/12.561404

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