DocumentCode :
3533218
Title :
A retrieval algorithm for aerosol optical depth from MODIS multi-spatial scale data based on mutual information
Author :
Li, Yingjie ; Xue, Yong ; Guang, Jie ; Wang, Ying ; Mei, Linlu
Volume :
5
fYear :
2009
fDate :
12-17 July 2009
Abstract :
A retrieval algorithm for AOD from MODIS multi-spatial scale data with 1 km × 1 km, 500 m × 500 m and 250 m × 250 m resolution based on mutual information (MI) is proposed. The concept of mutual information represents a measure of relative entropy between two sets. In this algorithm, an interpolation formula based on the maximal MI which is used to transform low resolution image into high resolution image is constructed. Then, the AOD with 500 m × 500 m and 250 m × 250 m resolution which are over Heihe Watershed, in Gansu province, China, on 5th July, 2008 are retrieved from TERRA and AQUA MODIS data. Compared with the 500 m × 500 m AOD retrieved by multi-satellite algorithm directly, the AOD with 500 m × 500 m resolution got by the MI algorithm is coincident with absolute error between 0.02-0.03. Preliminary validation result comparing with AERONET measured data shows good accuracy and promising potential. The Further research work is ongoing.
Keywords :
aerosols; atmospheric optics; atmospheric techniques; remote sensing; AD 2008 07 05; AERONET data comparison; AQUA MODIS data; China; Gansu province; Heihe Watershed; MODIS multispatial scale data; TERRA MODIS data; aerosol optical depth; mutual information; retrieval algorithm; Aerosols; Image resolution; Image retrieval; Information retrieval; MODIS; Mutual information; Optical sensors; Remote sensing; Surface cracks; Surface fitting; MODIS; aerosol optical depth (AOD); multi-spatial scale; mutual information (MI); remote sensing retrieval;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Geoscience and Remote Sensing Symposium,2009 IEEE International,IGARSS 2009
Conference_Location :
Cape Town
Print_ISBN :
978-1-4244-3394-0
Electronic_ISBN :
978-1-4244-3395-7
Type :
conf
DOI :
10.1109/IGARSS.2009.5417623
Filename :
5417623
Link To Document :
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