An evaluation of the accuracy of the ASTER GDEM and the role of stack number: A case study of Nisiros Island, Greece

Miliaresis, GCh; Paraschou, CVE

dc.contributor.author	Miliaresis, GCh	en
dc.contributor.author	Paraschou, CVE	en
dc.date.accessioned	2014-03-01T01:35:09Z
dc.date.available	2014-03-01T01:35:09Z
dc.date.issued	2011	en
dc.identifier.issn	2150-704X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20974
dc.subject.other	Advanced spaceborne thermal emission and reflection radiometer	en
dc.subject.other	Athens , Greece	en
dc.subject.other	Digital elevation model	en
dc.subject.other	Digital surface models	en
dc.subject.other	Grid points	en
dc.subject.other	Land cover	en
dc.subject.other	Physiographic regions	en
dc.subject.other	Root mean square errors	en
dc.subject.other	Stack-numbers	en
dc.subject.other	Study areas	en
dc.subject.other	Vertical accuracy	en
dc.subject.other	Volcanic islands	en
dc.subject.other	Working groups	en
dc.subject.other	Digital instruments	en
dc.subject.other	Geomorphology	en
dc.subject.other	Surveying	en
dc.subject.other	accuracy assessment	en
dc.subject.other	ASTER	en
dc.subject.other	digital elevation model	en
dc.subject.other	elevation	en
dc.subject.other	error analysis	en
dc.subject.other	image analysis	en
dc.subject.other	land cover	en
dc.subject.other	sensor	en
dc.subject.other	volcanic island	en
dc.subject.other	Dodecanese	en
dc.subject.other	Greece	en
dc.subject.other	Nisyros	en
dc.subject.other	Southern Aegean	en
dc.title	An evaluation of the accuracy of the ASTER GDEM and the role of stack number: A case study of Nisiros Island, Greece	en
heal.type	journalArticle	en
heal.identifier.primary	10.1080/01431161.2010.503667	en
heal.identifier.secondary	http://dx.doi.org/10.1080/01431161.2010.503667	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	A reference digital elevation model (RDEM) produced by the Hellenic Military Geographical Service (HMGS) (Athens, Greece) is used to assess the vertical accuracy of the ASTER (advanced spaceborne thermal emission and reflection radiometer) global digital elevation model (GDEM) for a small volcanic island, Nisiros, in south-east Greece. The overall vertical accuracy of theGDEMis within the root mean square error (RMSE) specified by the ASTER DEM Working Group. Despite this, ASTER GDEM is a product with variable vertical accuracy depending on the number of scenes (stack number (SN)) per grid point used for the computation of elevation. The exposure (SN) of a physiographic region to ASTER sensors seems to be elevation- and slope-dependent in this particular study area. The difference between the GDEM and RDEM may partly be explained by the fact that GDEM is a digital surface model and thus the variable landcover heights introduce additional error in accuracy estimates. © 2011 Taylor & Francis.	en
heal.publisher	TAYLOR & FRANCIS LTD	en
heal.journalName	Remote Sensing Letters	en
dc.identifier.doi	10.1080/01431161.2010.503667	en
dc.identifier.isi	ISI:000292873000005	en
dc.identifier.volume	2	en
dc.identifier.issue	2	en
dc.identifier.spage	127	en
dc.identifier.epage	135	en