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| 1 | Sensitivity analysis of parameters and contrasting performance of ground filtering algorithms with UAV photogrammetry-based and LiDAR point clouds显示文摘Most ground filtering algorithms are primarily designed for airborne LiDAR point cloud processing and their successful use in identifying ground points from photogrammetric point clouds remains questionable.We compared six ground filtering algorithms implemented in Metashape,ArcGIS,CloudCompare,LAStools,and PDAL.We used UAV photogrammetry-based(acquired under leaf-off conditions)and airborne LiDAR(leaf-on)point clouds of the same area to:(i)compare accuracy of generated DTMs;(ii)evaluate the effect of vegetation density and terrain slope on filtering accuracy;and(iii)assess which algorithm parameters have the greatest effect on the filtering accuracy.Our results show that the performance of filtering algorithms was affected by the point cloud type,terrain slope and vegetation cover.The results were generally better for LiDAR(RMSE 0.13–0.19 m)than for photogrammetric(RMSE 0.19–0.23 m)point clouds.The behavior in varying vegetation and terrain conditions was consistent for LiDAR point clouds.However,when applied on photogrammetric point clouds,the algorithms’behavior was inconsistent,especially in areas of steep slope(except for the Progressive Triangulated Irregular Network in LAStools).Parameters related to the selection of the initial minimum elevation ground points were the most influential in all algorithms and point clouds. | Petr Klápště Michal Fogl Vojtěch Barták Kateřina Gdulová Rudolf Urban Vítězslav Moudrý | 2020 | International Journal of Digital Earth2020，13，12： | 2 |
| 2 | Landscape ecology: Ahierarchical perspective can help scientists understand spatial patterns显示文摘 | Urban D L O'Neill R V Shugart H H | 1987 | BioScience1987，37，： | 1 |
| 3 | Online Trust: A Stakeholder Perspective, Concepts, Implications, and Future Directions 显示文摘 | Shankar V Urban G L Sultan F | 2002 | Journal of Strategic Information Systems2002，11，34： | 1 |
| 4 | Expression of CD44s and CD44v6 in transitional cell carcinomas of the urinary bladder:comparison with tumour grade,proliferative activity and p53 immunoreactivity of tumour cells显示文摘 | Kuncova J Urban M Mandys V | 2007 | APMIS2007，115，11： | 1 |
| 5 | Restricted use of T cell receptor V genes in murine autoimmune encephalomyelitis raises possibilities for antibody therapy显示文摘 | Urban JL Kumar V Kono DH | 1988 | Cell1988，54，4： | 1 |
| 6 | Restricted use of T cell receptor V genes in murine autoimmune encephalomyelitis raises possibilities for antibody therapy显示文摘 | Urban JL Kumar V Kono DH | 1988 | Cell1988，54，4： | 1 |
| 7 | Determinants and consequences of trust in e-business:a large scale empirical study显示文摘 | SULTAN F URBAN G L SHANKAR V BART I | 2002 | Sloan school of Management MIT Working Paper2002，2002，： | 1 |
| 8 | Early detection of ovarian cancer: promise and reality 显示文摘 | Bast RC Jr Urban N Shridhar V | 2002 | Cancer Treat Res2002，107，： | 1 |
| 9 | Intra-arterial beta irradiation prevents neointimal hyperplasia in a hypercholesterolemic rabbit restenosis model显示文摘 | Verin V Poppwski Y Urban P | 1995 | Circulation1995，92，： | 1 |
| 10 | Antibody immunity to the p53onoogrnic protein is a prognostic indicator in ovarian cancer显示文摘 | Goodell V Salazar LG Urban N | 2006 | J Clin Oncol2006，24，5： | 1 |
| 11 | Restricted use of T cell re- ceptor V genes in murine autoimmune encephalomyelitis raises possibilities for antibody therapy显示文摘 | Urban JL Kumar V Kono DH | 1985 | Cell1985，54，4： | 1 |
| 12 | Induction of photosynthesis and importance of limitations during the in- duction phase in sun and shade leaves of five ecologically contrasting tree species from the temperate zone显示文摘 | Urban O Kosvancova M Marek M V | 2007 | Tree Physiology2007，27，8： | 1 |
| 13 | Neutrophil extracellular traps capture and kill Candida albicans yeast andhyphal forms显示文摘 | Urban C F Reichard U Brinkmann V | 2006 | Cell Microbiol2006，8，： | 1 |
| 14 | Increased level of phosphorylated akt measured by chemiluminescence-linked immunosorbene assay is a predictor of poor prognosis in primary breast cancer overexpressing c-erbB-2显示文摘 | Cicenas J Urban P Vuaroqueaux V | 2005 | Breast Cancer Res2005，7，3： | 1 |
| 15 | Glaucoma and cataract: combine operation or trabeculectomy first and cataract extraction later显示文摘 | Urban V Kammann MT Sturmer JP | 2000 | KlinMonatsbl Augenhei Lkd2000，216，2： | 1 |
| 16 | Bioflocculation in activated sludge:an analytic approach显示文摘 | URBAN V BLOCK J C MANEM J | 1993 | Water Research1993，27，6： | 1 |
| 17 | Neutrophil extracellular traps capture and kill Candida albicans yeast and hyphal forms 显示文摘 | Urban CF Reiehard U Brinkmann V | 2006 | Cell Microbiol2006，8，4： | 1 |
| 18 | Intraarterial bera iradiation prevents neointimal hyperplasia in a hypercholesterolemic rabbit restenosis model 显示文摘 | Popowski Y Urban P | 1995 | Circulation1995，92，： | 1 |
| 19 | Self-as- sembly of PbTe quantum dots into nanocrystal superlattices and glassy films显示文摘 | Urban J J Talapin D V Shevchenko E V | 2006 | J Am Chem Soc2006，128，10： | 1 |
| 20 | Determination of thiodiglycolic acid in urine by capillary electrophoresis 显示文摘 | Samcova E Kvasnicova V Urban J | 1999 | Chromatogr A1999，847，12： | 1 |
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