HydroSHEDS adalah produk pemetaan yang menyediakan informasi hidrografis untuk aplikasi skala regional dan global dalam format yang konsisten. Platform ini menawarkan serangkaian set data yang direferensikan secara geografis (vektor dan raster) dalam berbagai skala, termasuk jaringan sungai, batas daerah aliran sungai, arah drainase, dan akumulasi aliran. HydroSHEDS
didasarkan pada data elevasi yang diperoleh pada tahun 2000 oleh Shuttle Radar
Topography Mission (SRTM) NASA.
Kumpulan data arah drainase ini menentukan arah
aliran dari setiap sel dalam DEM yang dikondisikan ke tetangga
lereng bawah yang paling curam. Nilai arah drainase bervariasi dari 1
hingga 128. Semua sel outlet akhir ke laut ditandai dengan
nilai 0. Semua sel yang menandai titik terendah cekungan endoreik (cekungan pedalaman) ditandai dengan nilai -1. Nilai arah
saluran air mengikuti konvensi yang diadopsi oleh penerapan arah
aliran ESRI: 1=E, 2=SE, 4=S, 8=SW, 16=W, 32=NW,
64=N, 128=NE.
Set data ini memiliki resolusi 30 detik busur.
Set data yang tersedia pada 30 detik busur adalah DEM yang Dikondisikan secara Hidrologis, Arah Aliran (Drainase), dan Akumulasi Aliran.
Perhatikan bahwa kualitas data HydroSHEDS jauh lebih rendah untuk wilayah di atas 60 derajat lintang utara karena tidak ada data elevasi SRTM yang mendasarinya dan dengan demikian DEM beresolusi lebih kasar digunakan (HYDRO1k yang disediakan oleh USGS).
HydroSHEDS dikembangkan oleh Program Ilmu Konservasi World Wildlife Fund (WWF) dalam kemitraan dengan U.S. Geological Survey, International Centre for Tropical Agriculture, The Nature Conservancy, dan Center for Environmental Systems Research of the University of Kassel, Jerman.
Band
Ukuran Piksel 927,67 meter
Band
Nama
Min
Maks
Ukuran Piksel
Deskripsi
b1
0*
255*
meter
Nilai yang mungkin untuk arah drainase: 1=T, 2=ST, 4=S,
8=SB, 16=B, 32=BL, 64=U, 128=TL; sel outlet akhir ke samudra
ditandai dengan nilai 0 dan sel yang menandai titik
terendah cekungan endoreik (cekungan pedalaman) ditandai dengan
nilai 255 (nilai asli -1)
* perkiraan nilai min atau maks
Persyaratan Penggunaan
Persyaratan Penggunaan
Data HydroSHEDS gratis untuk penggunaan non-komersial dan komersial. Untuk mengetahui informasi selengkapnya, lihat Perjanjian Lisensi.
Kutipan
Kutipan:
Lehner, B., Verdin, K. Jarvis, A. (2008): New global hydrography
derived from spaceborne elevation data. Eos, Transactions, AGU,
89(10): 93-94.
HydroSHEDS adalah produk pemetaan yang memberikan informasi hidrografi untuk aplikasi skala regional dan global dalam format yang konsisten. Platform ini menawarkan serangkaian set data yang direferensikan secara geografis (vektor dan raster) dalam berbagai skala, termasuk jaringan sungai, batas daerah aliran sungai, arah drainase, dan akumulasi aliran. HydroSHEDS didasarkan pada data elevasi yang diperoleh pada tahun 2000 …
[null,null,[],[[["\u003cp\u003eHydroSHEDS provides hydrographic information like river networks and watershed boundaries at various scales, using a conditioned DEM based on SRTM elevation data.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset depicts drainage direction using values 1-128, representing flow direction to the steepest downslope neighbor, with 0 indicating ocean outlets and 255 (originally -1) marking endorheic basins.\u003c/p\u003e\n"],["\u003cp\u003eOffered at a 30 arc-second resolution (approximately 927 meters), it is freely available for both commercial and non-commercial use under the specified license.\u003c/p\u003e\n"],["\u003cp\u003eData quality is reduced above 60 degrees northern latitude due to the reliance on coarser-resolution DEM in the absence of SRTM data for those regions.\u003c/p\u003e\n"],["\u003cp\u003eDeveloped by WWF in partnership with USGS and other organizations, it is ideal for applications needing consistent and comprehensive hydrographic data.\u003c/p\u003e\n"]]],["The HydroSHEDS dataset, provided by WWF, offers hydrographic data, including drainage direction, based on 2000 SRTM elevation data. It defines flow direction from each cell to its steepest downslope neighbor, using values from 1 to 128, with 0 indicating ocean outlets and -1 inland sinks. This dataset, available at 30 arc-second resolution (927.67 meters per pixel), is freely available for both commercial and non-commercial use and can be accessed via Google Earth Engine.\n"],null,["# WWF HydroSHEDS Drainage Direction, 30 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\n\u003cbr /\u003e\n\n\nThis dataset is at 30 arc-second resolution.\nThe datasets available at 30 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\n927.67 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/30DIR');\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_30DIR) \n[WWF HydroSHEDS Drainage Direction, 30 Arc-Seconds](/earth-engine/datasets/catalog/WWF_HydroSHEDS_30DIR) \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/30DIR, 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_30DIR)"]]
