{"created":"2023-07-25T11:06:45.243196+00:00","id":10266,"links":{},"metadata":{"_buckets":{"deposit":"b7c71b3a-decc-487e-8720-a4af8d939852"},"_deposit":{"created_by":27,"id":"10266","owners":[27],"pid":{"revision_id":0,"type":"depid","value":"10266"},"status":"published"},"_oai":{"id":"oai:nipr.repo.nii.ac.jp:00010266","sets":[]},"author_link":["18062","20300","16814","20298","4055","20304","20305","20301"],"item_10001_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2014-12","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"4","bibliographicPageEnd":"326","bibliographicPageStart":" 315","bibliographicVolumeNumber":"8","bibliographic_titles":[{"bibliographic_title":"Polar Science"},{"bibliographic_title":"Polar Science","bibliographic_titleLang":"en"}]}]},"item_10001_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"A method is proposed for detecting clouds from whole-sky color images obtained with an all-sky camera (ASC) system. In polar regions, cloud detection using whole-sky images usually suffers from large uncertainties in fractional cloud cover retrievals because of large solar zenith angles (SZAs) and high surface albedo, which cause “whitening” in the images. These problems are addressed by using differences between real images and virtual clear-sky images for a particular observation time with the same SZA. The method is applied to ASC images obtained at Ny-Ålesund, Svalbard in May of 2005–2007, and the results are compared with Micro-Pulse Lidar (MPL) measurements. When no clouds were detected by MPL, the false cloud detection rate from ASC classification was 2.1% in total hours. Conversely, when clouds were detected by MPL, the ASC classification underestimated the clouds by 11.6%. In most cases, this occurred when MPL detected very optically thin clouds. Furthermore, the variability of cloud fractions estimated by MPL and ASC was roughly constant regardless of the SZA. Thus, it is confirmed that the method developed in this study is valid for cloud detection from whole-sky color images.","subitem_description_type":"Abstract"}]},"item_10001_description_6":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"極域に特有の高い地表面アルベドや低い太陽高度は、全天画像から雲を抽出する際の不確実性の一因となっている。本研究では、理論的に作成した晴天画像と、全天カメラで撮影された画像との比較から雲の有無を判別する解析手法を開発した。スバールバル諸島ニーオルスンに観測基地で2005～2007年5月に取得された全天カメラ画像に本解析手法を適用し、マイクロパルスライダー（MPL）による雲観測と比較した。MPL観測より雲が無いと判断されたにも関わらず、全天画像では雲と分類されたケースは、全データに対して2.1 %あった。一方で、MPL観測では雲と分類され、全天画像では雲が無いと判別されたケースは11.6 %あった。光学的に非常に薄い雲に対する両計測器の感度の違いが、この差を生じた主な要因と考えられる。また、太陽天頂角に対する雲検出精度について評価し、季節や時間によらずに全天画像から雲が検出できることを確かめた。","subitem_description_type":"Other"}]},"item_10001_relation_14":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"10.1016/j.polar.2014.07.004"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"http://doi.org/10.1016/j.polar.2014.07.004","subitem_relation_type_select":"DOI"}}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Yabuki, Masanori"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Shiobara, Masataka"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Nishinaka, Kimiko"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Kuji, Makoto"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Yabuki, Masanori","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Shiobara, Masataka","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Nishinaka, Kimiko","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Kuji, Makoto","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Development of a cloud detection method from whole-sky color images","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Development of a cloud detection method from whole-sky color images"},{"subitem_title":"Development of a cloud detection method from whole-sky color images","subitem_title_language":"en"}]},"item_type_id":"10001","owner":"27","path":["1375"],"pubdate":{"attribute_name":"公開日","attribute_value":"2014-11-26"},"publish_date":"2014-11-26","publish_status":"0","recid":"10266","relation_version_is_last":true,"title":["Development of a cloud detection method from whole-sky color images"],"weko_creator_id":"27","weko_shared_id":27},"updated":"2023-07-25T16:22:24.037604+00:00"}