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001-es BibID:	BIBFORM061429
Első szerző:	Varga Zsolt (építőmérnök)
Cím:	Evaluating the Accuracy of Orthophotos and Satellite Images in the Context of Road Centerlines in Test Sites in Hungary / Zsolt Varga, Herta Czedli, Csaba Kezi, Jozsef Loki, Akos Fekete, Janos Biro
Dátum:	2015
ISSN:	1815-932X 1993-6079
Megjegyzések:	Improvement and constant change in science, technology and innovation in our modern life demands knowledge of a variety of geo-information applications, thus tools of data processing, display, analysis and simulation while fulfilling an interdisciplinary role, promote decision making and analytic procedures of engineering, ecological and marketing tasks. Aerial and satellite images have been used worldwide for the purpose of conducting various projects (studies of changes in land cover, classification, defining land usage) with photos serving mostly as starting points, a basis for our analyses. Assuming that different aerial and satellite images shall yield data of varying accuracy, subject to the scale and resolution of the photos as well as the type of depicted cartographic units, it is essential to have advance knowledge of expected accuracy of the photos to be used before the evaluation is performed. The aim of our analysis was to determine the difference between the vector files obtained from digitized orthophotos and those obtained by using geodesic measurements; we examined whether accuracy was subject to varying resolutions of orthophotos or satellite images. We have analyzed aerial photos and satellite images of two chosen test sites by comparing points and lines obtained by landscape measurements with those digitalized from orthophotos. By using statistical methods we defined the expected accuracy (resolutions used were 0.4 and 0.65 m/pixel) of road centerlines digitized from photos. Our study wants to emphasize that the assessments we apply may be utilized for planning and research work and the resulting data may effectively be used for road line planning as well as determining road segments and public utility crossings.
Tárgyszavak:	Műszaki tudományok Építőmérnöki tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Research Journal of Applied Sciences. - 10 : 10 (2015), p. 568-573. -
További szerzők:	Lóki József (1946-) (geográfus) Czédli Herta (1977-) (környezetvédelmi ökológus, fizikus) Kézi Csaba Gábor (1983-) (matematikus) Fekete Ákos Biró János (1971-) (birtokrendező mérnök)
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM061515
Első szerző:	Varga Zsolt (építőmérnök)
Cím:	Ortofotók pontossági vizsgálata úttengelyek alapján / Varga Zsolt, Czédli Herta, Kézi Csaba, Fekete Ákos
Dátum:	2015
Megjegyzések:	The data obtained from orthophotos evaluation may vary in accuracy according to the scale andresolution on the one hand and the types of cartographic units depicted on them on the other. Therefore,expected accuracy of the data to be obtained from the photos meant for use should be known prior toevaluation. Provided we have advance knowledge of the accuracy values, it may be judged whether thedata would meet the requirements of the task in hand. In order to define these accuracy values we haveevaluated aerial images of two chosen test sites by comparing points and lines obtained by landscapemeasurements with those digitalized from orthophotos. The aim of our analysis was to determine thedifference between the vector files obtained from digitized orthophotos and those obtained by usinggeodesic measurements. We have examined whether accuracy changed with different resolutions oforthophotos. By using statistical methods we defined the expected accuracy of road centerlines digitizedfrom photos. The determination was done by using 0.1 m/pixel, 0.4 m/pixel and 0.5 m/pixel resolutions.Our study wants to point out that the assessments we apply may indirectly be put to use for planning andresearch work, and the resulting data may effectively be used for road line planning, and determining roadsegments and public utility crossings.
ISBN:	978-963-473-916-6
Tárgyszavak:	Műszaki tudományok Építőmérnöki tudományok tanulmány, értekezés
Megjelenés:	Proceedings of the Conference on Problem-based Learning in Engineering Education : 29th October 2015 / ed. Imre Kocsis. - p. 66-74. -
További szerzők:	Fekete Ákos Czédli Herta (1977-) (környezetvédelmi ökológus, fizikus) Kézi Csaba Gábor (1983-) (matematikus)
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
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