该数据集为中国2002年1：25万三级流域分区数据，含三级流域分区边界、流域分区名称及流域编码信息，是常用的全国水资源分区资料（水资源分区是在一个时期内相对固定并带有一定强制性的分区模式，以利于在一个相当长的时期内各项水利规划都采用统一的基本资料）。
", "ds_source": "全国1:25万流域二级分级数据，全国DEM数据，全国水系数据.
", "ds_process_way": "在中国1:25万一级、二级流域分级数据的基础上，结合相应dem信息进行提取，并对得到的三级级流域分别进行相应编码。
", "ds_quality": "其数据完整性、逻辑一致性、位置精度、属性精度、接边精度、现势性均符合国家测绘局制定的有关技术规定和标准的要求，质量优良可靠。
", "ds_acq_start_time": "2002-01-01 00:00:00", "ds_acq_end_time": "2020-01-07 00:00:00", "ds_acq_place": "中国", "ds_acq_lon_east": 135.06666666666666, "ds_acq_lat_south": 3.85, "ds_acq_lon_west": 73.51666666666667, "ds_acq_lat_north": 53.516666666666666, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "login-access", "ds_total_size": 866023591, "ds_files_count": 2, "ds_format": "ARC/INFO GRID", "ds_space_res": null, "ds_time_res": "", "ds_coordinate": "西安80", "ds_projection": "", "ds_thumbnail": "4f518dc4-4963-4ab4-b7e0-b5feb49d53e0.jpg", "ds_thumb_from": 2, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "", "ds_from_station": null, "organization_id": "52b7b79b-860c-49a5-9083-9a70cf8bed5a", "ds_serv_man": "敏玉芳", "ds_serv_phone": "0931-4967596", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "", "subject_codes": [ "170.4510" ], "quality_level": 3, "publish_time": "2021-01-09 16:04:28", "last_updated": "2023-08-23 17:03:11", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.nieer.2020.1335", "i18n": { "en": { "title": "National 1:250000 three-level River Basin data set", "ds_format": "ARC/INFO GRID", "ds_source": "National 1:250000 watershed secondary classification data, national DEM data, national water system data
", "ds_quality": "Its data integrity, logical consistency, position accuracy, attribute accuracy, edge connection accuracy and current situation all meet the requirements of the relevant technical regulations and standards formulated by the State Bureau of Surveying and mapping, and its quality is excellent and reliable.
", "ds_ref_way": "", "ds_abstract": "This data set is China's 1:250000 three-level watershed zoning data in 2002, including three-level watershed zoning boundary, watershed zoning name and watershed code information. It is commonly used national water resources zoning data (water resources zoning is relatively fixed within a period of time with a certain mandatory zoning model, so as to facilitate the adoption of a unified basis for all water conservancy planning in a relatively long period of time This information).
", "ds_time_res": "", "ds_acq_place": "China", "ds_space_res": "", "ds_projection": "", "ds_process_way": "On the basis of 1:25a and 2-level watershed classification data in China, the corresponding DEM information is extracted, and the three-level basins are coded respectively.
", "ds_ref_instruction": "In order to respect intellectual property rights, protect the rights and interests of data authors, expand the services of data centers, and evaluate the application potential of data, data users are requested to clearly indicate the data source and data authors in the research results (including published papers, works, data products and unpublished research reports, data products, etc.) produced by using data. For data reprinted (secondary or multiple releases), the author must also indicate the source of the original data." } }, "submit_center_id": "ncdc", "data_level": 0, "license_type": "CC BY 4.0", "ds_topic_tags": [ "水资源分区", "水系", "流域界线", "流域分区", "全国湖泊流域基础数据", "中国" ], "ds_subject_tags": [ "自然地理学" ], "ds_class_tags": [], "ds_locus_tags": [ "中国", "中国区域" ], "ds_time_tags": [ 2002 ], "ds_contributors": [ { "true_name": "沈永平", "email": "shenyp@lzb.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" } ], "ds_meta_authors": [ { "true_name": "沈永平", "email": "shenyp@lzb.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" } ], "ds_managers": [ { "true_name": "沈永平", "email": "shenyp@lzb.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" } ], "category": "水文" }