3527 KB54 KB197320252024Boubaker, BoudhaneEl Amine, Slimani MohammedGourine, BachirHasni, Kamelštevilka:4letnik:68str. 432-450ISSN:0351-0271DOI:10.15292/geodetski-vestnik.2024.04.432-450COBISSID:222828291URN:URN:NBN:SI:doc-5CCAH7TUenZveza geodetov SlovenijeGeodetski vestnikcombined methodkombinirana metodaOranpogrezanje površjaPSInSARSBASsubsidenceAssessing ground displacement in Oran city, Algeria| a comparative analysis of PSInSAR, SBAS, and combined method| Primerjalna analiza metod PSInSAR, SBAS in kombinirane metode za določitev pogrezanja površja v mestu Oran, Alžirija|Coastal cities are grappling with ground deformation, making monitoring the temporal evolution of ground subsidence crucial. Advanced interferometric techniques, such as PSInSAR and SBAS provide a pertinent mean to observe this phenomenon by supplying dense displacement measurements for an extended period. However, while these algorithms have proven their effectiveness in some areas, their performance is less consistent in others. As such, there is a growing need to enhance the quality of displacement estimation through the development of new combination methods. In this study, Envisat images were used to assess the measurement quality of the displacement over Oran city using PSInSAR, SBAS, and a fusion technique from 2003 to 2010. Our findings indicate that PSInSAR and SBAS techniques mean velocities have similar values, ranging from -2.8 to 4.4 mm/yr and -4.6 to 4 mm/yr, respectively. Though, PSInSAR demonstrated a good distribution in urban areas and a greater precision, with a maximum standard deviation of 1.4 mm/yr, compared to SBAS that performed well in rural areas and which had a maximum standard deviation of 3.6 mm/yr. The combination method outcome was denser with a higher number of detectable pixels. Its mean velocity ranged from -4.6 to 4.2 mm/yr, with a better distribution in both urban and rural areas. Overall, the combination technique estimated displacements with better precision than the other methods, highlighting its potential as an effective tool for monitoring ground deformationObalna mesta se spopadajo z deformacijo tal, zato je spremljanje časovnega razvoja posedanja površja tal bistvenega pomena. Napredne interferometrične tehnike, kot sta PSInSAR in SBAS, so pomembne za opazovanje tega pojava, saj omogočajo goste meritve premikov za daljše obdobje. Vendar pa ti algoritmi na nekaterih območjih delujejo bolje kot na drugih, zato se kaže vse večja potreba po izboljšanju kakovosti ocenjevanja premikov z razvojem novih kombiniranih metod. V tej študiji so bili za oceno kakovosti meritev premikanja tal v mestu Oran uporabljeni satelitski posnetki Envisat iz let od 2003 do 2010 ter metodi PSInSAR, SBAS in kombinirana metoda. Naši rezultati kažejo, da imata tehniki PSInSAR in SBAS podobne vrednosti povprečnih hitrosti premikov, ki se gibljejo od –2,8 do 4,4 mm/leto in od –4,6 do 4 mm/leto. PSInSAR daje dobro porazdelitev sipalcev v urbanih območjih in večjo natančnost premikov, z največjim standardnim odklonom 1,4 mm/leto, medtem ko SBAS daje dobre rezultate na podeželskih območjih in ima največji standardni odklon 3,6 mm/leto. Rezultat kombinirane metode je bil gostejši in z več zaznanimi sipalci. Povprečna hitrost premikov se je gibala od –4,6 do 4,2 mm/leto, z dobro porazdelitvijo na urbanih in ruralnih območjih. Na splošno so bili premiki s kombinirano metodo ocenjeni natančneje kot z drugima tehnikama, kar kaže, da bi lahko postala učinkovito orodje za spremljanje sprememb talTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaZveza geodetov Slovenije