CHRISTINE: Code for high resolution satellite mapping of optical thickness and Ångstrom exponent

Sifakis, NI; Iossifidis, C; Kontoes, C

dc.contributor.author	Sifakis, NI	en
dc.contributor.author	Iossifidis, C	en
dc.contributor.author	Kontoes, C	en
dc.date.accessioned	2014-03-01T02:52:35Z
dc.date.available	2014-03-01T02:52:35Z
dc.date.issued	2010	en
dc.identifier.issn	0277786X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/35949
dc.subject	Ångstrom exponent	en
dc.subject	Aerosols	en
dc.subject	Air pollution	en
dc.subject	Optical thickness	en
dc.subject	Remote sensing	en
dc.subject	Satellite	en
dc.subject	Urban	en
dc.subject.other	Aerosol optical thickness	en
dc.subject.other	Aerosol size distributions	en
dc.subject.other	Atmospheric changes	en
dc.subject.other	Atmospheric effects	en
dc.subject.other	Coefficient approximation	en
dc.subject.other	Complementary features	en
dc.subject.other	High confidence	en
dc.subject.other	High resolution satellites	en
dc.subject.other	High spatial resolution	en
dc.subject.other	Optical thickness	en
dc.subject.other	Potential sources	en
dc.subject.other	Power law	en
dc.subject.other	Reference image	en
dc.subject.other	Satellite images	en
dc.subject.other	Spectral band	en
dc.subject.other	Urban	en
dc.subject.other	Urban areas	en
dc.subject.other	Air quality	en
dc.subject.other	Clouds	en
dc.subject.other	Image processing	en
dc.subject.other	Optical data processing	en
dc.subject.other	Pollution	en
dc.subject.other	Remote sensing	en
dc.subject.other	Satellites	en
dc.subject.other	Atmospheric aerosols	en
dc.title	CHRISTINE: Code for high resolution satellite mapping of optical thickness and Ångstrom exponent	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1117/12.864453	en
heal.identifier.secondary	http://dx.doi.org/10.1117/12.864453	en
heal.identifier.secondary	78270G	en
heal.publicationDate	2010	en
heal.abstract	According to the ""contrast reduction"" principle the aerosol optical thickness (AOT) can be retrieved and mapped over heterogeneous (such as urban) areas using a set of two satellite images of high spatial resolution: (i) one ""reference image"" with minimum aerosol content involving negligible AOT, and (ii) one ""polluted image"" with AOT to be assessed. AOT values retrieved in this way are thus relative to the reference image, and could be miscalculated when other than atmospheric changes have taken place in the time between the acquisitions of the two images. Previously developed DTA and SMA image processing codes are subject to this potential source of AOT miscalculation because the contrast reduction is applied to single spectral bands. The new CHRISTINE code takes into consideration contrast reduction in more than one spectral band and uses the Ångstrom's power law to isolate atmospheric effects attributable to aerosols. Preliminary testing of the new code over the Athens urban area against results obtained using the previous codes showed a considerable improvement in terms of the area over which AOT can be retrieved with high confidence. CHRISTINE has also a complementary feature of providing information on the aerosol size distribution emerging from Ångstrom coefficient approximation. © 2010 SPIE.	en
heal.journalName	Proceedings of SPIE - The International Society for Optical Engineering	en
dc.identifier.doi	10.1117/12.864453	en
dc.identifier.volume	7827	en