We attempt to visually classify the morphologies of 18190 molecular clouds, which are identified in the $^{12}$CO(1-0) spectral line data over $\sim$ 450 deg$^{2}$ of the second Galactic quadrant from the Milky Way Imaging Scroll Painting project (MWISP). Using the velocity-integrated intensity maps of the $^{12}$CO(1-0) emission, molecular clouds are first divided into unresolved and resolved ones. The resolved clouds are further classified as non-filaments or filaments. Among the 18190 molecular clouds, $\sim$ 25 $\%$ are unresolved, $\sim$ 64$\%$ are non-filaments, and $\sim$ 11$\%$ are filaments. In the terms of the integrated flux of $^{12}$CO(1-0) spectra of the whole 18190 molecular clouds, $\sim$ 90$\%$ are from filaments, $\sim$ 9$\%$ are from non-filaments, and the rest $\sim$ 1$\%$ are from unresolved sources. Although non-filaments are dominant in the number of the discrete molecular clouds, filaments are the main contributor of $^{12}$CO emission flux. We also present the number distributions of physical parameters of the molecular clouds in our catalog, including their angular sizes, velocity spans, peak intensities of $^{12}$CO(1-0) emission, and $^{12}$CO(1-0) total fluxes. We find that there is a systematic difference between the angular sizes of the non-filaments and filaments, with the filaments tending to have larger angular scales. The H$_{2}$ column densities of them are not significantly different. We also discuss the observational effects, such as those induced by the finite spatial resolution, beam dilution and line-of-sight projection, on the morphological classification of molecular clouds in our sample.
Distances to molecular clouds in the Galactic longitude l=10-20 deg from the MWISP 12CO 1-0 survey
Purple Mountain Observatory, Chinese Academy of Sciences（中国科学院紫金山天文台）；University of Science and Technology of China, Chinese Academy of Sciences（中国科学院大学）；Center for Astronomy and Space Sciences, China Three Gorges University（三峡大学天文与空间科学中心）；College of Science, China Three Gorges University（三峡大学理学院）
The Stellar "Snake"-III: Co-evolution of Stars and Molecular Clouds Unveiled by Gaia, MWISP, and LAMOST
School of sciences, HangZhou Dianzi University（杭州电子科技大学理学院）；Zhejiang Branch of National Astronomical Data Center（国家天文台浙江分中心）；Institute of Astronomy and Information, Dali University（大理大学天文与信息学院）；School of Physics and Astronomy, China West Normal University（西华师范大学物理与天文学院）；Purple Mountain Observatory, Chinese Academy of Sciences（中国科学院紫金山天文台）
Statistical Properties of Molecular Clouds in the Milky Way: Insights from Three-Isotopologue CO Observations of the MWISP Project
Purple Mountain Observatory, Chinese Academy of Sciences（中国科学院紫金山天文台）；State Key Laboratory of Radio Astronomy and Technology, Purple Mountain Observatory, Chinese Academy of Sciences（中国科学院紫金山天文台射电天文与技术国家重点实验室）
A study of the Physical Properties and Star Formation Activity of a Large Sample of Molecular Clouds: I Distances
Purple Mountain Observatory, Chinese Academy of Sciences（中国科学院紫金山天文台）；University of Science and Technology of China, Chinese Academy of Sciences（中国科学院大学）
A Morphological Identification and Study of Radio Galaxies from LoTSS DR2. I. The "Winged'' Radio Galaxies
Xiamen University（厦门大学）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, NCU（尼古拉·哥白尼大学物理、天文与信息学学院天体物理研究所）；Jadavpur University（贾达普大学）
Transformer-Based Source Detection and Morphological Classification in LOFAR Deep-Field Continuum Images
University of Oxford（牛津大学）；Instituto de Astrofísica de Canarias（加那利天体物理研究所）；Universidad de La Laguna（拉古纳大学）；University of Malta（马耳他大学）；Anqing Normal University（安庆师范大学）；University of Science and Technology of China（中国科学技术大学）
Deep Extragalactic VIsible Legacy Survey (DEVILS): Morphologically-selected galaxy merger fractions and their direct comparison to close-pair samples
The University of Western Australia（西澳大利亚大学）；Monash University（莫纳什大学）；Instituto Astrofisica de Canarias（加那利天体物理研究所）；Institute of Space Sciences (ICE, CSIC)（空间科学研究所）
Visual morphological classification of the full MaNGA DR17 sample: a general characterization
Universidad Nacional Autónoma de México. Instituto de Astronomía（墨西哥国立自治大学天文学研究所）；Instituto de Astronomía y Ciencias Planetarias, Universidad de Atacama（阿塔卡马大学天文与行星科学研究所）；Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México（墨西哥国立自治大学理学院物理系）
Machine learning technique for morphological classification of galaxies from SDSS. IV. CNN-Assisted Expert Validation of Morphological Catalogues for Merging, Irregular, Edge-on, Barred, Ringed, and Dust-lane Galaxies at 0.003 < z < 0.1
Main Astronomical Observatory of the NAS of Ukraine（乌克兰国家科学院主天文台）
Radio Galaxy Zoo: Morphological classification by Fanaroff-Riley designation using self-supervised pre-training
University of Manchester（曼彻斯特大学）；Alan Turing Institute（艾伦·图灵研究所）；University of Oxford（牛津大学）；Macquarie University（麦考瑞大学）；University of Tasmania（塔斯马尼亚大学）；CSIRO Space & Astronomy（澳大利亚联邦科学与工业研究组织空间与天文部）；ICRAR, University of Western Australia（西澳大利亚大学星际计算与实时系统研究中心）
Molecular Clouds in the Second Quadrant of the Milky Way Mid-plane from l$=$104$.\!\!^{\circ}$75 to l=119$.\!\!^{\circ}$75 and b=$-$5$.\!\!^{\circ}$25 to b=5$.\!\!^{\circ}$25
The assembly of bulge-dominated galaxies: two evolutionary channels traced through morphology, kinematics, and environment with a hybrid classification pipeline
Universidade Cidade de São Paulo（圣保罗城市大学）；Universidade de São Paulo, IAG（圣保罗大学天体物理研究所）；California Institute of Technology（加州理工学院）；Instituto de Astrofísica de Canarias（加那利群岛天体物理研究所）；Universidad Técnica Federico Santa María（费德里科·Santa玛利亚技术大学）
CO Structures with Narrow Lines in Nearby Quiescent Regions
Purple Mountain Observatory, Chinese Academy of Sciences（中国科学院紫金山天文台）；School of Astronomy and Space Science, University of Science and Technology of China（中国科学技术大学天文与空间科学学院）；State Key Laboratory of Radio Astronomy and Technology, Purple Mountain Observatory, Chinese Academy of Sciences（中国科学院紫金山天文台射电天文与技术国家重点实验室）
Geometry and Kinematics of Molecular Cloud Substructures in the Second Galactic Quadrant
Purple Mountain Observatory and Key Laboratory of Radio Astronomy, Chinese Academy of Sciences（中国科学院紫金山天文台）；University of Science and Technology of China（中国科学技术大学）
An updated efficient galaxy morphology classification model based on ConvNeXt encoding with UMAP dimensionality reduction
Anqing Normal University（安庆师范大学）；Institute of Astronomy and Astrophysics, Anqing Normal University（安庆师范大学天体物理研究所）；Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education（教育部现代天文学与天体物理学重点实验室（南京大学））；Dali University（大理大学）；Shanghai Astronomical Observatory, Chinese Academy of Sciences（中国科学院上海天文台）；School of Astronomy and Space Science, University of Chinese Academy of Sciences（中国科学院大学天文与空间科学学院）
Hierarchical Structure and Self-gravity in the Rosette Molecular Cloud
Purple Mountain Observatory and Key Laboratory of Radio Astronomy, Chinese Academy of Sciences（中国科学院紫金山天文台射电天文重点实验室）；School of Astronomy and Space Science, University of Science and Technology of China（中国科学技术大学天文与空间科学学院）
