Vertical accuracy of the SRTM DTED level 1 of Crete

Miliaresis, GCh; Paraschou, CVE

dc.contributor.author	Miliaresis, GCh	en
dc.contributor.author	Paraschou, CVE	en
dc.date.accessioned	2014-03-01T01:23:19Z
dc.date.available	2014-03-01T01:23:19Z
dc.date.issued	2005	en
dc.identifier.issn	0303-2434	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16907
dc.subject	Accuracy	en
dc.subject	Digital elevation models	en
dc.subject	Interferometric synthetic aperture radar	en
dc.subject	SRTM	en
dc.subject	Terrain analysis	en
dc.subject	Terrain segmentation	en
dc.subject.classification	Remote Sensing	en
dc.subject.other	accuracy assessment	en
dc.subject.other	digital elevation model	en
dc.subject.other	digital terrain model	en
dc.subject.other	synthetic aperture radar	en
dc.subject.other	Crete	en
dc.subject.other	Eastern Hemisphere	en
dc.subject.other	Eurasia	en
dc.subject.other	Europe	en
dc.subject.other	Greece	en
dc.subject.other	Southern Europe	en
dc.subject.other	World	en
dc.title	Vertical accuracy of the SRTM DTED level 1 of Crete	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.jag.2004.12.001	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jag.2004.12.001	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	A reference digital elevation model (DEM), produced from contour lines digitization, from topographic maps at scale 1:250.000 is used in order to assess the vertical accuracy of the SRTM DTED level 1 in Crete Island in Southern Greece. The error image interpretation revealed three types of systematic errors: (a) stripping, (b) large voids and (c) those errors resulted from the mis-registration of the Shuttle Radar Topography Mission (SRTM) imagery to the local datum. Terrain was segmented to plane regions and sloping regions. Sloping regions were segmented to aspect regions (aspect being standardized to the eight geographic directions defined in a raster/grid image). Error statistics was computed for the study area as well as the individual terrain classes. Vertical accuracy was found to be terrain class dependent. Sloping regions present greater mean error than the plane ones. Statistical tests verified that the difference in mean error between aspect regions that slope in opposite geographic directions is statistically significant. The greater mean error is observed for SW, W and NW aspect regions. The additional finishing steps applied to the SRTM dataset were not sufficient enough for the systematic errors and the terrain class dependency of the error to be corrected. The observed root-mean-square error (RMSE) for the SRTM DTED-1 of Crete do not fulfil the 16 m RMSE specification for the SRTM mission while the USA national map accuracy standards for the scale 1:250.000 are satisfied. (c) 2005 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	International Journal of Applied Earth Observation and Geoinformation	en
dc.identifier.doi	10.1016/j.jag.2004.12.001	en
dc.identifier.isi	ISI:000231697600004	en
dc.identifier.volume	7	en
dc.identifier.issue	1	en
dc.identifier.spage	49	en
dc.identifier.epage	59	en