Radiometer-based estimation of the atmospheric optical thickness

Karathanassi, V; Rokos, D; Andronis, V; Papayannis, A

dc.contributor.author	Karathanassi, V	en
dc.contributor.author	Rokos, D	en
dc.contributor.author	Andronis, V	en
dc.contributor.author	Papayannis, A	en
dc.date.accessioned	2014-03-01T02:50:52Z
dc.date.available	2014-03-01T02:50:52Z
dc.date.issued	2006	en
dc.identifier.issn	03796566	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/35167
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-33749162695&partnerID=40&md5=df19ee94833051588c3eeaa7d62b5577	en
dc.subject	Atmospheric optical thickness	en
dc.subject	Extinction coefficient	en
dc.subject	Lidar system	en
dc.subject	Radiance	en
dc.subject	Radiometer	en
dc.subject	Reflectance	en
dc.subject	SPOT imagery	en
dc.subject.other	Aerosols	en
dc.subject.other	Geostationary satellites	en
dc.subject.other	Imaging systems	en
dc.subject.other	Optical radar	en
dc.subject.other	Radiation	en
dc.subject.other	Radiometers	en
dc.subject.other	Reflection	en
dc.subject.other	Atmospheric optical thickness	en
dc.subject.other	Extinction coefficient	en
dc.subject.other	Lidar systems	en
dc.subject.other	Radiance	en
dc.subject.other	SPOT imagery	en
dc.subject.other	Atmospheric optics	en
dc.title	Radiometer-based estimation of the atmospheric optical thickness	en
heal.type	conferenceItem	en
heal.publicationDate	2006	en
heal.abstract	Atmospheric optical thickness affects the quality of satellite imagery, especially over urban areas where aerosol concentrations (sulphates, soot, mineral dust, etc.) are high. Optical thickness is usually provided by photometer or Lidar ground station measurements and introduced in empirical atmospheric correction models. However, Lidar wavelengths do not correspond - in number and value - to those used by satellite sensors, and therefore they introduce drawbacks in atmospheric correction methods. In this paper, a methodology developed for estimating atmospheric optical thickness by the use of satellite images and ground radiometer (GER 1500) is described. Lidar measurements of the optical thickness at two wavelengths, 355 nm and 532 nm, served for validation purposes. Within this framework, two major issues are investigated. The first concerns the most appropriate target in an urban environment that yields the most accurate atmospheric optical thickness value. The second deals with the appropriate surrounding area of the target. Evaluation of results showed that using the methodology developed, targets of olive leaves within a black artificial area produce the most accurate atmospheric optical thickness.	en
heal.journalName	European Space Agency, (Special Publication) ESA SP	en
dc.identifier.issue	628	en