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| 1 | Accuracy assessment of real-time kinematics(RTK)measurements on unmanned aerial vehicles(UAV)for direct geo-referencing显示文摘Geospatial information acquired with Unmanned Aerial Vehicles(UAV)provides valuable decision-making support in many different domains,and technological advances coincide with a demand for ever more sophisticated data products.One consequence is a research and development focus on more accurately referenced images and derivatives,which has long been a weakness especially of low to medium cost UAV systems equipped with relatively inexpensive inertial measurement unit(IMU)and Global Navigation Satellite System(GNSS)receivers.This research evaluates the positional accuracy of the real-time kinematics(RTK)GNSS on the DJI Matrice 600 Pro,one of the first available and widely used UAVs with potentially surveying-grade performance.Although a very high positional accuracy of the drone itself of 2 to 3 cm is claimed by DJI,the actual accuracy of the drone RTK for positioning the images and for using it for mapping purposes without additional ground control is not known.To begin with,the actual GNSS RTK position of reference center(the physical point on the antenna)on the drone is not indicated,and uncertainty regarding this also exists among the professional user community.In this study the reference center was determined through a set of experiments using the dual frequency static Leica GNSS with RTK capability.The RTK positioning data from the drone were then used for direct georeferencing,and its results were evaluated.Test flights were carried out over a 70 x 70 m area with an altitude of 40 m above the ground,with a ground sampling distance of 1.3 cm.Evaluated against ground control points,the planimetric accuracy of direct georeferencing for the photogrammetric product ranged between 30 and 60 cm.Analysis of direct georeferencing results showed a time delay of up to 0.28 seconds between the drone GNSS RTK and camera image acquisition affecting direct georeferencing results. | Desta Ekaso Francesco Nex Norman Kerle | 2020 | Geo-Spatial Information Science2020，23，2： | 3 |
| 2 | Acute Effects of Smoking during Modified Sham Feeding in Duodenal Ulcer Patients: An Analysis of Nicotine, Acid Secretion, Gastrin, Catecholamines, Epidermal Growth Factor, Prostaglandin E2, and Bile Acids显示文摘 | G. Lindell L.-O. Farnebo D. Chen E. Nex? J. Rask Madsen K. Bukhave H. Graffner | 1993 | Scandinavian Journal of Gastroenterology1993，，6： | 1 |
| 3 | Petrology, geo- chemistry and mineralization of post-collisional magmatism in the southern Central Zone, Damaran Orogen, Namibia显示文摘 | Nex P A M Kinnaird J A Oliver G J H | 2001 | Journal of African Earth Sciences2001，33，： | 1 |
| 4 | From DSM to 3d Building Models: a Quantitative Evaluation 显示文摘 | Macay Moreia J M Nex F Agugiaro G | 2013 | ISPRS - International Archives of the Photogram- metry Remote Sensing and Spatial Information Sciences2013，1，1： | 1 |
| 5 | Pharmacokinetics of trefoil peptides and their stability in gastrointestinal contents显示文摘 | Kjellev S Vestergaard EM Nexφ E | 2007 | Peptides2007，3，67： | 1 |
| 6 | Performance Analysis of the SIFT Operator for Automatic Feature Extraction and Matching in Photogrammetric Applications 显示文摘 | Lingua A Marenchino D Nex F | 2009 | Sensors2009，9，5： | 1 |
| 7 | 显示文摘 | Femández -García M Salamanca L N | 2000 | J Phys Chem B2000，104，： | 1 |
| 8 | Contrasting sources for lead in Cu-polymetallie and Zn-Pb mineralisation in Ireland: Constraints from lead isotopes 显示文摘 | Kinnaird J Ixer R Barreiro B Nex P | 2002 | Mineralium Deposita2002，37，5： | 1 |
| 9 | Aerial multi-camera systems: Accuracy and block triangulation issues显示文摘 | Ewelina Rupnik Francesco Nex Isabella Toschi Fabio Remondino | 2015 | ISPRS Journal of Photogrammetry and Remote Sensin2015，，： | 1 |
| 10 | Petrology, geochemistry and mineralisation of post-collisional magmatism around Goanikontes, southern central zone, Damara Orogen, Namibi- a 显示文摘 | Nex P A M Kinnaird J A and Oliver G J H | 2001 | Journal of african earth sciences2001，33，： | 1 |
| 11 | Spinel-bearing assemblages and P T-t evolution of the central zone of the Damara Orogen, Na- mibia 显示文摘 | Nex P A M Oliver G J H and Kinnaird J A | 2001 | Journal of african earth sciences2001，32，： | 1 |
| 12 | Increased mRNA expression levels of ERCC1, OGG1 and RA1 in colorectal adenomas and carcinomas 显示文摘 | Szebφ M Skjelbred CF Nexφ BA | 2006 | BMC Cancer2006，6，： | 1 |
| 13 | Effect of secretin and somatostatin on secretion of epidermal growth factor from brunner’s glands in the rat显示文摘 | Peter Skov Olsen MD DM Preben Kirkegaard MD DM Steen Seier Poulsen MD Ebba Nex? MD DM | 1994 | Digestive Diseases and Sciences1994，，10： | 1 |
| 14 | Granites and their mineralization in the Swakop River area around Goanikontes, Namibia 显示文摘 | Nex P A M Kinnaird J A | 1995 | Communications of the geological survey of Namibia1995，10，： | 1 |
| 15 | UAV and RPV Systems for Photogrammetric Surveys in Archaelogi- cM Areas: Two Tests in the Piedmont Region (Italy) 显示文摘 | Chiabrando F Nex F Piatti D et M | 2011 | 3ournal of Archaeological Science2011，38，69： | 1 |
| 16 | Peroxisome proliferatoractivated receptor-gamma2 Pro12Ala, interaction with alcohol intake and NSAID use, in relation to risk of breast cancer in a prospective study of Danes 显示文摘 | Vogel U Christensen J Nexφ B A | 2007 | Carcinogenesis2007，28，2： | 1 |
| 17 | Metabolism of oral trefoil factor 2 (TFF2) and the effect of oral and parenteral TFF2 on gastric and duodenal ulcer healing in the rat显示文摘 | Poulsen SS Thulesen J Christensen L Nexφ E Thim L | | 0，，04： | 1 |
| 18 | GPX Pro198Leu and OGG1 Ser326Cys polymorphisms and risk of development of colorectal adenomas and colorectal cancer显示文摘 | Rikke Hansen Mona S?b? Camilla Furu Skjelbred Bj?rn Andersen Nex? Per Christian Hagen Günther Bock Inger Marie Bowitz Lothe Egil Johnson Steinar Aase Inger-Lise Hansteen Ulla Vogel Elin H. Kure | 2005 | Cancer Letters2005，，1： | 1 |
| 19 | A review of geological controls on uranium mineralization in sheeted leucogranites within the Damaran orogen,Namibia显示文摘 | Kinnaird J A Nex P A M | | 0，，02： | 1 |
| 20 | Pharmacokinetics of trefoil peptides and their stability in gastrointestinal contents显示文摘 | Stine Kjellev Else Marie Vestergaard Ebba Nex? Peter Thygesen Maria S. Egh?j Palle B. Jeppesen Lars Thim Nis Borbye Pedersen Steen Seier Poulsen | 2007 | Peptides2007，，6： | 1 |
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