该数据集为黄河上游、中游和下游全流域的水流长度数据集。
\n水流长度是指地面上一点沿水流方向到其流向起点〈终点）间的最大地面距离在水平面的投影长度。水流长度在水文中是水土保持的主要因子。其他条件相同时，水力侵蚀的强度依据水流经过的坡的长度来决定，坡面越长，汇集的流量越大，水的侵蚀力就越强。水流长度直接影响地面径流的速度，从而影响对地面土壤的侵蚀力。
\n数据分为顺流（down）和逆流（up）
", "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": 6568711560, "ds_files_count": 9, "ds_format": "tiff", "ds_space_res": "30", "ds_time_res": "", "ds_coordinate": "WGS84", "ds_projection": "WGS_1984_Word_Merctor", "ds_thumbnail": "1a0e7fc8-8dc1-4c74-a6b2-e6a20d7b6ee4.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": [ "170.55" ], "quality_level": 3, "publish_time": "2021-09-01 09:15:39", "last_updated": "2025-05-29 10:53:09", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.nieer.2020.1675", "i18n": { "en": { "title": "Yellow River Basin Hydrological Analysis Dataset - Stream Length", "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 stream length data for the entire Yellow River basin, including its upstream, midstream, and downstream sections.
\nStream length refers to the maximum ground distance, projected onto the horizontal plane, from a point on the ground along the direction of water flow to the starting point (or endpoint) of its flow direction. Stream length is a major factor in soil and water conservation in hydrology. When other conditions are the same, the intensity of hydraulic erosion is determined by the length of the slope over which the water flows; the longer the slope, the greater the concentrated flow, and the stronger the erosive force of the water. Stream length directly affects the velocity of overland flow, and thus affects its erosive force on the ground soil.
\nThe data is divided into downstream (down) and upstream (up) directions.
", "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": "" } }, "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": [ "顺流", "水流长度", "水文分析", "黄河流域", "逆流" ], "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" }