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001-es BibID:	BIBFORM063091
Első szerző:	Varga Katalin
Cím:	Improved land cover mapping using aerial photographs and satellite images / Katalin Varga, Szilárd Szabó, Gergely Szabó, György Dévai, Béla Tóthmérész
Dátum:	2014
ISSN:	2391-5447
Megjegyzések:	Manual Land Cover Mapping using aerial photographsprovides sufficient level of resolution for detailedvegetation or land cover maps. However, in some casesit is not possible to achieve the desired information overlarge areas, for example from historical data where thequality and amount of available images is definitely lowerthan from modern data. The use of automated and semiautomatedmethods offers the means to identify the vegetationcover using remotely sensed data. In this paper automatedmethods were tested on aerial photographs andsatellite images to extract better and more reliable informationabout vegetation cover. These tests were performedby using automated analysis of LANDSAT7 images (withand without the surface model of the Shuttle Radar TopographyMission (SRTM)) and two temporally similar aerialphotographs. The spectral bands were analyzed with supervised(maximum likelihood) methods. In conclusion, the SRTM and the combination of two temporally similar aerial photographs from earlier years were useful in separating the vegetation cover on a floodplain area. In addition the different date of the vegetation season also gave reliable information about the land cover. High quality information about old and present vegetation on a large area is an essential prerequisites ensuring the conservation ofecosystems.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban LANDSAT vegetation season vegetation type maximum likelihood mapping accuracy srtm Doktori iskola
Megjelenés:	Open Geosciences. - 7 : 1 (2014), p. 15-26. -
További szerzők:	Szabó Szilárd (1974-) (geográfus) Szabó Gergely (1975-) (geográfus) Dévai György (1942-) (ökológus) Tóthmérész Béla (1960-) (ökológus)
Pályázati támogatás:	NKFP-3B/0019/2002 Egyéb NKFP 6-00013/2005 Egyéb TÁMOP-4.2.2/B-10/1-2010-0024 TÁMOP Juhász-Nagy Pál Doktori Iskola Bolyai János Kutatási Ösztöndíj Egyéb TÁMOP-4.2.4/A/2-11-1-2012-0001 TÁMOP National Excellence Program
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001-es BibID:	BIBFORM096138
035-os BibID:	(cikkazonosító)2339 (Scopus)85114018366 (WoS)000694519200001
Első szerző:	Yaqoob, Majd Muwafaq
Cím:	Changes in algal plankton composition and physico-chemical variables in a shallow oxbow lake / Majd Mufafaq Yaqoob, Csaba Berta, László József Szabó, György Dévai, Szilárd Szabó, Sándor Alex Nagy, István Bácsi, Alexandra Simon, János Nagy, Imre Somlyai, Éva Ács, István Grigorszky
Dátum:	2021
ISSN:	2073-4441
Megjegyzések:	In our work, we sought to answer whether we find differences among the various zones of an oxbow lake with different land uses based on physico-chemical variables and dominant algal plankton species. The two ends of the oxbow lake are bordered by settlements, and near them there are open water areas where fishing is the major utilization form. Between the two open water areas we find a protected area with a large aquatic plant coverage and two transition zones towards the open water areas. The oxbow lake receives periodic water replenishment only at one end from one of the open water areas. During summer?due to the lack of rain?the water of the oxbow lake is used for irrigation in the surrounding arable land, so the water level fluctuation can be significant in the riverbed. Our study was performed within a vegetation period of spring, early summer, mid-summer, and fall. In connection with the ecological classification of a smaller water body, studies on the physical and chemical properties of the water and the composition of the algal plankton are usually carried out in few places and relatively infrequently. The characteristics of a water body are also influenced by seasonal changes, which can be the changes in the extent of vegetation coverage, the way land is used and the possibility of water replenishment, to which the algal community usually responds with changes. Based on our study, it can be said that even in a relatively small water body, we found a large differences based on the chemical and physical properties of the water and the characteristic algal species. Open water zones, areas with large macrovegetation coverage, and the transition zones were separated from each other.
Tárgyszavak:	Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk phytoplankton physico-chemical oxbow lake macrophytes open water PCA
Megjelenés:	Water. - 13 : 17 (2021), p. 1-20. -
További szerzők:	Berta Csaba (1991-) (hidrobiológus) Szabó László József (1955-) (ökológus, hidrobiológus) Dévai György (1942-) (ökológus) Szabó Szilárd (1974-) (geográfus) Nagy Sándor Alex (1956-) (hidrobiológus) Bácsi István (1977-) (biológus) Simon Alexandra Nagy János (1951-) (agrármérnök, mérnök-tanár) Somlyai Imre (1978-) (okleveles hidrobiológus) Ács Éva (1970-) (biológus, ökológus) Grigorszky István (1967-) (biológus-ökológus)
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