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Card: related datasets, JCCDB v5.0 observation layer (ogasurfproject/jccdb-observations) and USCCDB (ogasurfproject/usccdb)

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  # JCCDB — Japan Construction Cost open DataBase
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  **現行版 v4.0(2026-08-28) / 95,403品目 / CC BY 4.0**
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  **データセットDOI: [10.5281/zenodo.22127752](https://doi.org/10.5281/zenodo.22127752)**
 
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  # JCCDB — Japan Construction Cost open DataBase
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+ <!-- hs-related-v5 -->
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+ ## 関連データ / Related datasets
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+ このリポの中身(2026.04 版の参考単価)は変えていません。別のリポとして、次の 2 つを公開しました。
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+ - **JCCDB v5.0 観測層(日本)**: 日本の公的な出典 76 からの観測 330,362 行。1 行 1 観測で、証拠の URL・原本の頁・利用条件つき。https://huggingface.co/datasets/ogasurfproject/jccdb-observations 、DOI https://doi.org/10.5281/zenodo.22980284(全部の版 https://doi.org/10.5281/zenodo.22127751)
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+ - **USCCDB(米国の建設費データベース)**: 米国の公的な出典 2,375 からの観測 2,849,829 行。https://huggingface.co/datasets/ogasurfproject/usccdb 、DOI https://doi.org/10.5281/zenodo.22979157
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+ The contents of this repository (the 2026.04 reference prices) are unchanged. Two related datasets are published as separate repositories: the JCCDB v5.0 observation layer for Japan (330,362 rows from 76 public sources, each with its evidence URL and licence), https://huggingface.co/datasets/ogasurfproject/jccdb-observations, DOI https://doi.org/10.5281/zenodo.22980284; and USCCDB, the United States Construction Cost Database (2,849,829 rows), https://huggingface.co/datasets/ogasurfproject/usccdb, DOI https://doi.org/10.5281/zenodo.22979157. Public-works unit prices, statistics and indexes are reference data, not renovation quotes.
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  **現行版 v4.0(2026-08-28) / 95,403品目 / CC BY 4.0**
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  **データセットDOI: [10.5281/zenodo.22127752](https://doi.org/10.5281/zenodo.22127752)**