HydroSHEDS는 일관된 형식으로 지역 및 전역 규모 애플리케이션에 수문학 정보를 제공하는 매핑 제품입니다. 하천 네트워크, 유역 경계, 배수 방향, 흐름 누적 등 다양한 규모의 지리 참조 데이터 세트 (벡터 및 래스터)를 제공합니다. HydroSHEDS는 2000년에 NASA의 셔틀 레이더 지형 임무 (SRTM)에서 획득한 고도 데이터를 기반으로 합니다.
이 배수 방향 데이터 세트는 조건화된 DEM의 각 셀에서 가장 가파른 하향 경사 이웃으로의 흐름 방향을 정의합니다. 배수 방향 값은 1~128입니다. 바다로 연결되는 모든 최종 출구 셀은 값 0으로 표시됩니다. 내륙 분지의 최저점을 표시하는 모든 셀은 -1 값으로 플래그가 지정됩니다. 배수 방향 값은 ESRI의 흐름 방향 구현에서 채택한 규칙을 따릅니다. 1=E, 2=SE, 4=S, 8=SW, 16=W, 32=NW, 64=N, 128=NE
이 데이터 세트는 15초 해상도입니다.
15초에서 사용할 수 있는 데이터 세트는 수문학적 조건 DEM, 배수 (흐름) 방향, 흐름 누적입니다.
기본 SRTM 고도 데이터를 사용할 수 없어 더 조잡한 해상도의 DEM (USGS에서 제공한 HYDRO1k)이 사용되었기 때문에 북위 60도 이상의 지역에서는 HydroSHEDS 데이터의 품질이 크게 낮습니다.
HydroSHEDS는 세계자연기금 (WWF) 보존 과학 프로그램이 미국 지질조사국, 국제 열대 농업 센터, 네이처 컨서번시, 독일 카셀 대학교 환경 시스템 연구 센터와 협력하여 개발했습니다.
대역
픽셀 크기 463.83미터
대역
이름
최소
최대
픽셀 크기
설명
b1
0*
255*
미터
배수 방향 가능 값: 1=E, 2=SE, 4=S, 8=SW, 16=W, 32=NW, 64=N, 128=NE; 바다로 향하는 최종 출구 셀은 값 0으로 표시되고 내륙 분지의 최저점을 표시하는 셀은 값 255(-1의 원래 값)로 표시됩니다.
* 예상 최솟값 또는 최댓값
이용약관
이용약관
HydroSHEDS 데이터는 비상업적 및 상업적 용도로 무료로 사용할 수 있습니다. 자세한 내용은 라이선스 계약을 참고하세요.
인용
인용:
Lehner, B., Verdin, K., Jarvis, A. (2008): New global hydrography
derived from spaceborne elevation data. Eos, Transactions, AGU,
89(10): 93-94.
HydroSHEDS는 지역 및 전 세계 규모 애플리케이션에 수문학 정보를 일관된 형식으로 제공하는 매핑 제품입니다. 하천 네트워크, 유역 경계, 배수 방향, 흐름 누적 등 다양한 규모의 지리 참조 데이터 세트 (벡터 및 래스터)를 제공합니다. HydroSHEDS는 2000년에 획득한 고도 데이터를 기반으로 합니다.
[null,null,[],[[["\u003cp\u003eHydroSHEDS provides hydrographic information like river networks, watershed boundaries, and drainage directions at various scales.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset is based on NASA's SRTM elevation data from 2000 and uses a drainage direction schema where values indicate flow direction.\u003c/p\u003e\n"],["\u003cp\u003eIt is available at 15 arc-second resolution and has lower quality above 60 degrees northern latitude due to limitations in underlying elevation data.\u003c/p\u003e\n"],["\u003cp\u003eHydroSHEDS is free for non-commercial and commercial use under its license agreement.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset was developed by WWF in collaboration with USGS, CIAT, TNC, and the Center for Environmental Systems Research.\u003c/p\u003e\n"]]],["The HydroSHEDS dataset, provided by WWF, offers hydrographic data from 2000, focusing on drainage direction. Key data includes flow direction from each cell to its steepest down-slope neighbor, with values 1-128, ocean outlets flagged as 0, and inland sinks as -1 (represented as 255). The 15 arc-second resolution data covers conditioned DEM, drainage direction, and flow accumulation, derived from NASA's SRTM. It's available for free use, and accessible via Earth Engine using `ee.Image(\"WWF/HydroSHEDS/15DIR\")`.\n"],null,["# WWF HydroSHEDS Drainage Direction, 15 Arc-Seconds\n\nDataset Availability\n: 2000-02-11T00:00:00Z--2000-02-22T00:00:00Z\n\nDataset Provider\n:\n\n\n [WWF](https://www.hydrosheds.org/)\n\nTags\n:\n[direction](/earth-engine/datasets/tags/direction) [drainage](/earth-engine/datasets/tags/drainage) [flow](/earth-engine/datasets/tags/flow) [geophysical](/earth-engine/datasets/tags/geophysical) [hydrography](/earth-engine/datasets/tags/hydrography) [hydrology](/earth-engine/datasets/tags/hydrology) [hydrosheds](/earth-engine/datasets/tags/hydrosheds) [srtm](/earth-engine/datasets/tags/srtm) [surface-ground-water](/earth-engine/datasets/tags/surface-ground-water) [water](/earth-engine/datasets/tags/water) [wwf](/earth-engine/datasets/tags/wwf) \n\n#### Description\n\nHydroSHEDS is a mapping product that provides hydrographic\ninformation for regional and global-scale applications in a consistent\nformat. It offers a suite of geo-referenced datasets (vector and\nraster) at various scales, including river networks, watershed\nboundaries, drainage directions, and flow accumulations. HydroSHEDS\nis based on elevation data obtained in 2000 by NASA's Shuttle Radar\nTopography Mission (SRTM).\n\nThis drainage direction dataset defines the direction\nof flow from each cell in the conditioned DEM to its steepest\ndown-slope neighbor. Values of drainage direction vary from 1\nto 128. All final outlet cells to the ocean are flagged with\na value of 0. All cells that mark the lowest point of an endorheic\nbasin (inland sink) are flagged with a value of -1. The drainage\ndirection values follow the convention adopted by ESRI's flow\ndirection implementation: 1=E, 2=SE, 4=S, 8=SW, 16=W, 32=NW,\n64=N, 128=NE.\n\nThis dataset is at 15 arc-second resolution.\nThe datasets available at 15 arc-seconds are the Hydrologically\nConditioned DEM, Drainage (Flow) Direction, and Flow Accumulation.\n\nNote that the quality of the HydroSHEDS data is significantly lower for regions above\n60 degrees northern latitude as there is no underlying SRTM elevation data available\nand thus a coarser-resolution DEM was (HYDRO1k provided by USGS).\n\nHydroSHEDS was developed by the World Wildlife Fund (WWF)\nConservation Science Program in partnership with the U.S. Geological\nSurvey, the International Centre for Tropical Agriculture, The\nNature Conservancy, and the Center for Environmental Systems Research\nof the University of Kassel, Germany.\n\n### Bands\n\n\n**Pixel Size**\n\n463.83 meters\n\n**Bands**\n\n| Name | Min | Max | Pixel Size | Description |\n|------|-----|-------|------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `b1` | 0\\* | 255\\* | meters | Drainage direction possible values: 1=E, 2=SE, 4=S, 8=SW, 16=W, 32=NW, 64=N, 128=NE; final outlet cells to the ocean are flagged with a value of 0 and cells that mark the lowest point of an endorheic basin (inland sink) are flagged with a value of 255 (original value of -1) |\n\n\\* estimated min or max value\n\n### Terms of Use\n\n**Terms of Use**\n\nHydroSHEDS data are free for non-commercial and commercial\nuse. For more information, please refer to the [License Agreement](https://www.hydrosheds.org/page/license).\n\n### Citations\n\nCitations:\n\n- Lehner, B., Verdin, K., Jarvis, A. (2008): New global hydrography\n derived from spaceborne elevation data. Eos, Transactions, AGU,\n 89(10): 93-94.\n\n### Explore with Earth Engine\n\n| **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine)\n\n### Code Editor (JavaScript)\n\n```javascript\nvar dataset = ee.Image('WWF/HydroSHEDS/15DIR');\nvar drainageDirection = dataset.select('b1');\nvar drainageDirectionVis = {\n min: 1.0,\n max: 128.0,\n palette: [\n '000000', '023858', '006837', '1a9850', '66bd63', 'a6d96a', 'd9ef8b',\n 'ffffbf', 'fee08b', 'fdae61', 'f46d43', 'd73027'\n ],\n};\nMap.setCenter(-121.652, 38.022, 8);\nMap.addLayer(drainageDirection, drainageDirectionVis, 'Drainage Direction');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/WWF/WWF_HydroSHEDS_15DIR) \n[WWF HydroSHEDS Drainage Direction, 15 Arc-Seconds](/earth-engine/datasets/catalog/WWF_HydroSHEDS_15DIR) \nHydroSHEDS is a mapping product that provides hydrographic information for regional and global-scale applications in a consistent format. It offers a suite of geo-referenced datasets (vector and raster) at various scales, including river networks, watershed boundaries, drainage directions, and flow accumulations. HydroSHEDS is based on elevation data obtained in 2000 ... \nWWF/HydroSHEDS/15DIR, direction,drainage,flow,geophysical,hydrography,hydrology,hydrosheds,srtm,surface-ground-water,water,wwf \n2000-02-11T00:00:00Z/2000-02-22T00:00:00Z \n-67.3 -180 62 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://www.hydrosheds.org/)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/WWF_HydroSHEDS_15DIR)"]]
