海洋調査技術(Joumal of the Japan Society for Marine Surveys and Technology)
11 (2) p.11〜18 September1999
海洋データセット作成･管理に際して発生し易い誤りとその原因―II.岩手県水産技術センターの事例と重複データの取り扱い―*
小熊幸子**･鈴木 亨**･永田 豊**･渡辺秀俊+･山口初代+･高杉 知++
Errors in Oceanic Dataset Ofen generated in Data Processing and in Data Management─II.Case of the Iwate Fisheries Technology Center, and Treatment of Duplicated Data─*
Sachiko Oguma** Toru Suzuki**, Yutaka Nagata**, Hidetoshi Watanabe+,Hatsuyo Yamaguchi+, and Satoru Takasugi++
ABSTRACT
After oceanic data were archived by a data management agency such as JODC (Japan Oceanographic Data Center) , even if questionable data are found, it is hard to send such data back to their originator for correction. They would not be eliminated from the dataset, but some error flag is put on them. However, it is desirable to minimize the number of questionable data. We investigated error sources which often happen in data processing, collection and storage processes, in order to find the way to improve the quality of data flowing into JODC/MIRC system. In the previous paper (Nagata et al. , 1999) , we analyzed dataset obtained by the Wakayama Research Center of Agriculture, Forestry and Fisheries (WRCAFF) , and found that errors are mainly generated in punching processes. In this paper, we report the results of the analysis on the database of the lwate Fisheries Technology Center (IFTO . The data quality in IFTC was much improved after 1970, as just as in WRCAFF. Many duplicated data were found in the database of IFTC. Main cause of the occurrence of duplication is that they make two kinds of dataset (Coastal Lines and Offshore Lines) , and that the data obtained at some stations were sometimes sent to both of the dataset.
Check of duplicated data is important in data management. We discuss techniques of duplication check by referring the case of IFTC.
1. はじめに
海洋情報研究センター(MIRC)では、日本海洋データセンター(JODC)に保管されている海洋データについて誤データのチェックを行うとともに、まだJODCに集められていないデータについて品質管理をした後JODCに送付する仕事を始めている。
*1999年8月6日受付
1999年9月22日受理
**(財)日本水路協会 海洋情報センター〒104-0061東京都中央区銀座7-15-4三島ビル5F
Marine Infomation Research Center, Japan Hydrographic Association
+三洋テクノマリン(株)〒103-0012東京都中央区日本橋堀留町1-3-17
Sanyo Techno Marine, Inc.
++岩手県水産技術センター〒3-75-3
Iwate Fisheries Technology Center
