研究目的
To perform a high-resolution aerosol optical depth (AOD) inversion from the HJ-1 satellites using a developed dark pixel algorithm based on MODIS methods, specifically for the Chengdu region.
研究成果
The AOD inversion using the 1.65 μm channel of HJ-1 satellites is feasible and accurate, with high correlation to MODIS and CE318 data. The rural aerosol model is most suitable for Chengdu, while the city model causes significant errors. Future work should address inversions in bright areas.
研究不足
The method is only suitable for dark target areas; not applicable to bright-object areas. Potential errors from albedo estimation and aerosol model assumptions; limited by the availability of ground-based data and sensor differences.
1：Experimental Design and Method Selection:
Developed a dark pixel algorithm based on MODIS for HJ-1 satellites, using the 6S radiation transportation model for simulations and establishing lookup tables for AOD inversion.
2：Sample Selection and Data Sources:
Used HJ-1 satellite data (CCD and IRS sensors) and MODIS data for comparison; ground-based CE318 solar photometer measurements for validation in Chengdu.
3：List of Experimental Equipment and Materials:
HJ-1 satellites (sensors: CCD and IRS), MODIS satellite, CE318 solar photometer, Google Earth for locating dense vegetation areas.
4：Experimental Procedures and Operational Workflow:
Data preprocessing (radiation calibration, vector cutting), selection of inversion pixels based on apparent reflectance thresholds, AOD inversion using lookup tables and Equation (1), validation with CE318 and MODIS data.
5：Data Analysis Methods:
Statistical correlation analysis, linear regression for relationships between channels, error calculation, and comparison with standard products.
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