20.500.12556/RUL-132798 Analiza vplivov na kakovost izdelkov UAV fotogrametrije Analysis of the impacts on the quality of UAV photogrammetric products Daljinsko vodeni letalniki (angl. unmanned aerial vehicles), opremljeni z različnimi senzorji in napravami, se v geodeziji, geoinformatiki in okoljskih strokah vse pogosteje uporabljajo za zajem prostorskih podatkov. Razvilo se je novo področje, to je UAV fotogrametrija, ki obravnava fotogrametrični zajem in obdelavo fotografij, pridobljenih z daljinsko vodenimi letalniki. V študiji analiziramo različne dejavnike, ki vplivajo na kakovost izdelkov UAV fotogrametrije, s poudarkom na položajni točnosti. Predstavljamo jih v treh skupinah, in sicer obravnavamo dejavnike vpliva, ki so povezani z: (a) lastnostmi fotoaparata in kakovostjo fotografij, (b) načrtovanjem in izvedbo snemalne misije ter (c) oslonilnimi točkami za posreden način georeferenciranja fotografij. Izbrane dejavnike smo analizirali na podlagi pregleda relevantnih znanstvenih objav, vpliv števila in razporeditve oslonilnih točk na položajno točnost oblaka točk pa smo dodatno preverili na lastnem primeru. Na koncu podajamo ključne ugotovitve in priporočila za izvajanje UAV fotogrametričnih projektov, kjer poudarjamo pomen snemanja v dobrih svetlobnih in vremenskih razmerah, uporabe čim boljše opreme, ustrezne izbire parametrov snemalne misije, zadostnega števila oslonilnih točk, ki so izmerjene z ustrezno položajno točnostjo, in njihove enakomerne razporeditve po območju obravnave. Unmanned aerial vehicles, equipped with various sensors and devices, are increasingly used to acquire geospatial data in geodesy, geoinformatics, and environmental studies. In this context, a new research and professional field has been developed % UAV photogrammetry % dealing with photogrammetry data acquisition and data processing, acquired by unmanned aerial vehicles. In this study, we analyse the selected factors that impact the quality of data provided using UAV photogrammetry, with the focus on positional accuracy; they are discussed in three groups: (a) factors related to the camera properties and the quality of images; (b) factors related to the mission planning and execution; and (c) factors related to the indirect georeferencing of images using ground control points. These selected factors are analysed based on the detailed review of relevant scientific publications. Additionally, the influence of the number of ground control points and their spatial distribution on point clouds' positional accuracy has been investigated for the case study. As the conclusion, key findings and recommendations for UAV photogrammetric projects are given; we have highlighted the importance of suitable lighting and weather conditions when performing UAV missions for spatial data acquisition, quality equipment, appropriate parameters of UAV data acquisition, and a sufficient number of ground control points, which should be determined with the appropriate positional accuracy and their correct distribution in the field. fotogrametrija daljinsko vodeni letalnik UAV UAV fotogrametrija kakovost oslonilne točke članki photogrammetry unmanned aerial vehicle UAV UAV photogrammetry quality ground control points true true true Slovenski jezik Angleški jezik Znanstveno delo 2021-11-03 13:47:50 2021-11-03 13:47:55 2022-09-12 04:13:47 0000-00-00 00:00:00 2020 0 0 Str. 489-507 št. 4 Letn. 64 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 2020-09-30 2020-11-28 528.7 0351-0271 10.15292/geodetski-vestnik.2020.04.489-507 45070595 RAZ_Kosmatin_Fras_Mojca_2020.pdf RAZ_Kosmatin_Fras_Mojca_2020.pdf 1 78CE2F8A2A94293E892DCB1106398174 32330b11b0e43209602bfa16a18986b6e2c979320445eb86ed8473135518c3e3 38c28c59-3ca4-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=150505 Fakulteta za gradbeništvo in geodezijo 0 0 0