该数据集为黄河上游、中游和下游全流域的汇。在流向栅格中，“洼地”是指流向无法被赋予8个有效值之的一个或一组间连接像元，也称为“汇” 。在所有相邻像元都高于处理像元时，或有两个像元互相流入形成一个由两个像元构成的循环时，均会出现洼地。
", "ds_source": "自主生产，原始黄河流域地形坡度数据集空间分辨率为30m。
", "ds_process_way": "Hydrology水文工具软件提取。
", "ds_quality": "本数据集经过DEM改正，平面精度和高程精度均小于一个像元。
", "ds_acq_start_time": "2020-01-01 00:00:00", "ds_acq_end_time": "2020-03-01 00:00:00", "ds_acq_place": "黄河流域", "ds_acq_lon_east": 119.345, "ds_acq_lat_south": 32.84166666666667, "ds_acq_lon_west": 95.88194444444444, "ds_acq_lat_north": 41.84388888888889, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "login-access", "ds_total_size": 221476563, "ds_files_count": 5, "ds_format": "tiff", "ds_space_res": "30", "ds_time_res": "", "ds_coordinate": "WGS84", "ds_projection": "WGS_1984_Word_Merctor", "ds_thumbnail": "8c013b78-f0ce-485b-adab-137b357cba7c.png", "ds_thumb_from": 2, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "在使用数据时，请注明本数据来自国家冰川冻土沙漠科学数据中心。", "ds_from_station": null, "organization_id": "b412fac3-1f10-4eb6-9d10-c51bcea30d0c", "ds_serv_man": "李红星", "ds_serv_phone": "0931-4967596", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "", "subject_codes": [ "170.55" ], "quality_level": 3, "publish_time": "2021-09-01 08:58:06", "last_updated": "2025-05-29 10:51:39", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.nieer.2020.1672", "i18n": { "en": { "title": "Yellow River Basin Hydrological Analysis Dataset - Flow Accumulation", "ds_format": "tiff", "ds_source": "Produced independently, the spatial resolution of the original topographic slope dataset for the Yellow River basin is 30 meters.
", "ds_quality": "This dataset has undergone DEM correction, with both horizontal and vertical accuracies being less than one pixel.
", "ds_ref_way": "", "ds_abstract": "This dataset represents the flow accumulation for the entire Yellow River basin, including its upstream, midstream, and downstream sections. In a flow direction raster, a \"depression\" refers to one or a group of interconnected cells where the flow direction cannot be assigned one of the eight valid values, also known as a \"sink\". Depressions occur when all neighboring cells are higher than the cell being processed, or when two cells flow into each other, forming a loop consisting of two cells.
", "ds_time_res": "", "ds_acq_place": "Yellow River Basin", "ds_space_res": "30", "ds_projection": "WGS_1984_Word_Merctor", "ds_process_way": "Extracted using the Hydrology software tool.
", "ds_ref_instruction": "When using data, please indicate that this data comes from the National Glacier Frozen Soil Desert Science Data Center." } }, "submit_center_id": "ncdc", "data_level": 0, "recommendation_value": 0, "license_type": "https://creativecommons.org/licenses/by/4.0/", "doi_reg_from": "reg_local", "cstr_reg_from": "reg_local", "doi_not_reg_reason": null, "cstr_not_reg_reason": null, "is_paper_in_submitting": false, "belong_to_nieer": false, "ds_topic_tags": [ "水文分析", "洼地", "黄河流域", "汇" ], "ds_subject_tags": [ "水文学" ], "ds_class_tags": [], "ds_locus_tags": [ "黄河", "黄河上中下游", "黄河流域" ], "ds_time_tags": [ 2020 ], "ds_contributors": [ { "true_name": "韩立钦", "email": "hanliqin@lzb.ac.cn", "work_for": "河南师范大学", "country": "中国" }, { "true_name": "张耀南", "email": "yaonan@lzb.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" }, { "true_name": "康建芳", "email": "kangjf@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": "韩立钦", "email": "hanliqin@lzb.ac.cn", "work_for": "河南师范大学", "country": "中国" } ], "ds_managers": [ { "true_name": "韩立钦", "email": "hanliqin@lzb.ac.cn", "work_for": "河南师范大学", "country": "中国" } ], "category": "水文" }