该数据集为黄河上游、中游和下游全流域的流量数据集，流量阈值为15000
\n汇流分析的主要目的是确定水流的路径。在流向栅格图的基础上生成汇流栅格图,汇流栅格上每个单元的值代表上游汇流区内流入该单元的栅格点总数,即汇入该单元的流入路径数（NIP）。NIP较大的区域可视为河谷,NIP等于0的区域则是较高的地方,可能为流域的分水岭。汇流分析的基本思想是以规则格网表示的DEM每点处有一个单位的水量,按照自然水流从高处流向低处的规律,根据区域的流向栅格计算每点所流过的水量值,便得到了区域的汇流栅格(汇流累积量)。
", "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": 1692402573, "ds_files_count": 11, "ds_format": "tiff", "ds_space_res": "30", "ds_time_res": "", "ds_coordinate": "WGS84", "ds_projection": "WGS_1984_Word_Merctor", "ds_thumbnail": "69deceae-3e52-47e1-8b01-01e5961ef021.jpg", "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": [], "quality_level": 3, "publish_time": "2021-09-01 09:16:39", "last_updated": "2025-05-29 10:53:10", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.nieer.2020.1676", "i18n": { "en": { "title": "Dataset of Hydrological Analysis in the Yellow River Basin - Discharge", "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 been corrected using DEM, with both horizontal and vertical accuracies being less than one pixel.
", "ds_ref_way": "", "ds_abstract": "This dataset contains flow data for the entire Yellow River basin, including its upstream, midstream, and downstream sections, with a flow threshold of 15,000.
\nThe main purpose of flow accumulation analysis is to determine the path of water flow. Based on the flow direction raster map, a flow accumulation raster map is generated, where the value of each cell on the flow accumulation raster represents the total number of raster points flowing into that cell from the upstream catchment area, i.e., the number of inflow paths (NIP) converging into that cell. Areas with a larger NIP can be considered valleys, while areas with an NIP of zero are higher locations, potentially representing watersheds within the basin. The basic idea of flow accumulation analysis is to assume that each point on a DEM represented by a regular grid has a unit volume of water. Following the natural flow of water from high to low areas, the water volume flowing through each point is calculated based on the flow direction raster of the region, resulting in the flow accumulation raster (flow accumulation amount) for the region.
", "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 is from the national glacier, frozen soil and desert science data center." } }, "submit_center_id": "ncdc", "data_level": 0, "license_type": "CC 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, "ds_topic_tags": [ "流量", "水文分析", "黄河流域" ], "ds_subject_tags": [], "ds_class_tags": [], "ds_locus_tags": [ "黄河流域", "黄河", "黄河上中下游" ], "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" }