8일 가시광선 적외선 이미징 방사계 제품군 (VIIRS) 표면 반사율 (VNP09H1) 버전 1 합성 제품은 공칭 500m 해상도(~463m)에서 3개의 이미지 밴드 (I1, I2, I3)에 대해 Suomi National Polar-orbiting Partnership (Suomi NPP) VIIRS 센서에서 추정한 지표면 반사율을 제공합니다. 500m 데이터 세트는 L2 입력 제품에서 기본 375m VIIRS 해상도를 리샘플링하여 파생됩니다. 데이터는 오존과 수증기를 비롯한 분자 기체의 영향과 대기 에어로졸의 영향 등 대기 조건에 따라 보정됩니다. 각 픽셀은 8일 동안의 최적의 레벨 2G 관측을 나타내며, 이는 높은 관측 범위, 낮은 센서 각도, 구름 또는 구름 그림자 없음, 에어로졸 로딩을 기준으로 선택됩니다.
반사율 밴드 3개, 이 제품에는 상태 품질 보증(QA) 레이어와 반사율 밴드 품질 레이어가 포함됩니다.
8일 가시광선 적외선 영상 방사계 (VIIRS) 지표면 반사율 (VNP09H1) 버전 1 합성 제품은 공칭 500m 해상도 (~463m)에서 3개의 이미지 밴드 (I1, I2, I3)에 대해 Suomi National Polar-orbiting Partnership (Suomi NPP) VIIRS 센서의 지표면 반사율 추정치를 제공합니다. 500m 데이터세트는 다음을 통해 파생됩니다.
[null,null,[],[[["\u003cp\u003eThe VNP09H1 product provides an 8-day composite of land surface reflectance from the Suomi NPP VIIRS sensor at 500m resolution.\u003c/p\u003e\n"],["\u003cp\u003eReflectance data is atmospherically corrected and includes quality assurance layers for cloud state, land/water, and aerosol conditions.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset covers the period from January 19, 2012, to November 24, 2024, and is freely accessible from NASA LP DAAC.\u003c/p\u003e\n"],["\u003cp\u003eImagery bands I1, I2, and I3 estimate land surface reflectance and are accompanied by quality control and state quality assurance bands.\u003c/p\u003e\n"],["\u003cp\u003eUsers are requested to cite the dataset appropriately when publishing results based on this data, with links and guidance provided.\u003c/p\u003e\n"]]],[],null,["Dataset Availability\n: 2012-01-19T00:00:00Z--2025-08-21T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA LP DAAC at the USGS EROS Center](https://doi.org/10.5067/VIIRS/VNP09H1.002)\n\nCadence\n: 1 Day\n\nTags\n:\n[daily](/earth-engine/datasets/tags/daily) [nasa](/earth-engine/datasets/tags/nasa) [noaa](/earth-engine/datasets/tags/noaa) [npp](/earth-engine/datasets/tags/npp) [reflectance](/earth-engine/datasets/tags/reflectance) [satellite-imagery](/earth-engine/datasets/tags/satellite-imagery) [sr](/earth-engine/datasets/tags/sr) [viirs](/earth-engine/datasets/tags/viirs) \n\nDescription \nThe 8-day Visible Infrared Imaging Radiometer Suite (VIIRS) Surface\nReflectance (VNP09H1) Version 1 composite product provides an estimate of\nland surface reflectance from the Suomi National Polar-orbiting Partnership\n(Suomi NPP) VIIRS sensor for three imagery bands (I1, I2, I3) at nominal\n500m resolution (\\~463m). The 500m dataset is derived through resampling the\nnative 375m VIIRS resolution in the L2 input product. The data are corrected\nfor atmospheric conditions such as the effects of molecular gases, including\nozone and water vapor, and for the effects of atmospheric aerosols. Each\npixel represents the best possible Level 2G observation during an 8-day\nperiod, which is selected on the basis of high observation coverage, low\nsensor angle, the absence of clouds or cloud shadow, and aerosol loading.\nThe three reflectance bands, this product includes a state quality assurance\n(QA) layer and a reflectance band quality layer.\n\nDocumentation:\n\n- [User's Guide](https://lpdaac.usgs.gov/documents/1657/VNP09_User_Guide_V2.pdf)\n\n- [Algorithm Theoretical Basis Document (ATBD)](https://lpdaac.usgs.gov/documents/122/VNP09_ATBD.pdf)\n\n- [General Documentation](https://lpdaac.usgs.gov/products/vnp09h1v002/)\n\n- [Land Product Quality Assessment website](https://landweb.modaps.eosdis.nasa.gov/browse?sensor=VIIRS&sat=SNPP)\n\nBands\n\n\n**Pixel Size**\n\n500 meters\n\n**Bands**\n\n| Name | Min | Max | Pixel Size | Description |\n|--------------------------|------|-------|------------|--------------------------------------------------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|\n| `SurfReflect_I1` | -100 | 16000 | meters | 500 m Surface Reflectance Band I1 |\n| `SurfReflect_I2` | -100 | 16000 | meters | 500 m Surface Reflectance Band I2 |\n| `SurfReflect_I3` | -100 | 16000 | meters | 500 m Surface Reflectance Band I3 |\n| `SurfReflect_QC_500m` | | | meters | Surface Reflectance Band Quality Control (QC) |\n| Bitmask for SurfReflect_QC_500m - Bits 0-1: MODLAND QA bits - 0: Corrected product produced at ideal quality all bands - 1: Corrected product produced at less than ideal quality some or all bands - 2: Corrected product not produced due to cloud effects all bands - 3: Corrected product not produced due to other reasons some or all bands may be fill value \\[Note that a value of (11) overrides a value of (01)\\]. - Bits 2-3: Cloud State - 0: Clear - 1: Cloudy - 2: Mixed - 3: Not set, assumed clear - Bits 4-7: Band 1 data quality four bit range - 0: Highest quality - 1: Noisy detector - 2: Dead detector, data interpolated in L1B - 3: Solar zenith \\\u003e= 86 degrees - 4: Solar zenith \\\u003e= 85 and \\\u003c 86 degrees - 5: Missing input - 6: Internal constant used in place of climatological data for at least one atmospheric constant - 7: Correction out of bounds, pixel constrained to extreme allowable value - 8: L1B data faulty - 9: Not processed due to deep ocean or clouds - Bits 8-11: Band 2 data quality four bit range - 0: Highest quality - 1: Noisy detector - 2: Dead detector, data interpolated in L1B - 3: Solar zenith \\\u003e= 86 degrees - 4: Solar zenith \\\u003e= 85 and \\\u003c 86 degrees - 5: Missing input - 6: Internal constant used in place of climatological data for at least one atmospheric constant - 7: Correction out of bounds, pixel constrained to extreme allowable value - 8: L1B data faulty - 9: Not processed due to deep ocean or clouds - Bit 12: Atmospheric correction performed - 0: No - 1: Yes - Bit 13: Adjacency correction performed - 0: No - 1: Yes - Bit 14: Different orbit from 500m - 0: No - 1: Yes ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||\n| `SurfReflect_State_500m` | | | meters | Surface Reflectance State Quality Assurance (QA) |\n| Bitmask for SurfReflect_State_500m - Bits 0-1: Cloud state - 0: Clear - 1: Cloudy - 2: Mixed - 3: Not set, assumed clear - Bit 2: Cloud shadow - 0: No - 1: Yes - Bits 3-5: Land/water flag - 0: Shallow ocean - 1: Land - 2: Ocean coastlines and lake shorelines - 3: Shallow inland water - 4: Ephemeral water - 5: Deep inland water - 6: Continental/moderate ocean - 7: Deep ocean - Bits 6-7: Aerosol quantity - 0: Climatology - 1: Low - 2: Average - 3: High - Bits 8-9: Cirrus detected - 0: None - 1: Small - 2: Average - 3: High - Bit 10: Cloud shadow - 0: No cloud - 1: Cloud - Bit 11: Internal fire algorithm flag - 0: No Fire - 1: Fire - Bit 12: Snow/ice flag - 0: No - 1: Yes - Bit 13: Pixel is adjacent to cloud - 0: No - 1: Yes - Bit 14: BRDF correction performed - 0: No - 1: Yes - Bit 15: Internal snow flag - 0: No snow - 1: Snow ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||\n\nTerms of Use\n\n**Terms of Use**\n\nLP DAAC NASA data are freely accessible; however, when an author\npublishes these data or works based on the data, it is requested that the\nauthor cite the datasets within the text of the publication and include a\nreference to them in the reference list.\n\nCitations \nCitations:\n\n- Please visit [LP DAAC 'Citing Our Data' page](https://lpdaac.usgs.gov/citing_our_data)\n\nDOIs\n\n- \u003chttps://doi.org/10.5067/VIIRS/VNP09H1.002\u003e\n\nExplore with Earth Engine **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\nCode Editor (JavaScript) \n\n```javascript\nvar dataset = ee.ImageCollection('NASA/VIIRS/002/VNP09H1')\n .filter(ee.Filter.date('2017-05-01', '2017-06-30'));\nvar rgb = dataset.select(['SurfReflect_I1', 'SurfReflect_I2', 'SurfReflect_I3']);\nvar rgbVis = {\n min: 0.0,\n max: 1.0,\n};\nMap.setCenter(17.93, 7.71, 2);\nMap.addLayer(rgb, rgbVis, 'RGB');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_VIIRS_002_VNP09H1) \n[VNP09H1: VIIRS Surface Reflectance 8-Day L3 Global 500m](/earth-engine/datasets/catalog/NASA_VIIRS_002_VNP09H1) \nThe 8-day Visible Infrared Imaging Radiometer Suite (VIIRS) Surface Reflectance (VNP09H1) Version 1 composite product provides an estimate of land surface reflectance from the Suomi National Polar-orbiting Partnership (Suomi NPP) VIIRS sensor for three imagery bands (I1, I2, I3) at nominal 500m resolution (\\~463m). The 500m dataset is derived through ... \nNASA/VIIRS/002/VNP09H1, daily,nasa,noaa,npp,reflectance,satellite-imagery,sr,viirs \n2012-01-19T00:00:00Z/2025-08-21T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.5067/VIIRS/VNP09H1.002](https://doi.org/https://doi.org/10.5067/VIIRS/VNP09H1.002)\n- [https://doi.org/10.5067/VIIRS/VNP09H1.002](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_VIIRS_002_VNP09H1)"]]
