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001-es BibID:BIBFORM061430
Első szerző:Varga Zsolt (építőmérnök)
Cím:Evaluating the accuracy of orthophotos in the context of forest borders in hungarian test sites / Zsolt Varga, Herta Czedli, Jozsef Loki, Janos Biro, Ákos Fekete
Dátum:2015
ISSN:1018-4619
Megjegyzések:Researchers all over the world need new tools andtechniques with which the conditions of the land and itsvegetation can be better evaluated. The most important oneof these, adapted for this purpose in recent years, is perhapsthe aerial photograph. Taking aerial photos in Hungaryserves for multiple purposes: assessment of the conditionsof farmland vegetation, vineyards, and orchards, demarcationof soil erosion, revealing damage caused by seepage,assessment of the woodland, survey of the tree populationwithin the woodland, and a comparison of actual woodlandareas with their legal situation. High resolution digital remotesensing photos are a potential means for comparativeanalysis of bigger areas, which is a priority in the light oftime and costs needed for field data interpretation. Prior toexecuting any comparative analysis, however, expected accuracyof data gained from photos should be known, so asto judge whether these data comply with accuracy requirementsof the task at hand. We have compared points, linesand polygons of manually obtained terrain measurementsand those digitized from orthophotos of the same chosenareas. Expected accuracy and reliability of forest bordersobtained by orthophoto digitization can be computed byusing a function constructed during our research. In our paper,we wish to emphasize that the analyses we appliedmay indirectly be utilized to analyze fluctuation andstrength of external conditions, fundamentally determiningsustainability of the ecological identity-stability of the livesystem, and further, that the results gained by the applicationof our method may be used effectively for planningand research purposes.
Tárgyszavak:Műszaki tudományok Építőmérnöki tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Fresenius Environmental Bulletin. - 24 : 12 (2015), p. 4239-4245. -
További szerzők:Czédli Herta (1977-) (környezetvédelmi ökológus, fizikus) Lóki József (1946-) (geográfus) Biró János (1971-) (birtokrendező mérnök) Fekete Ákos
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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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
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