AVHRR 잎 면적 지수 (LAI) 및 흡수된 광합성 활성 방사선 (FAPAR) 데이터 세트의 NOAA 기후 데이터 기록 (CDR)에는 식물의 수관 및 광합성 활동을 특징짓는 파생 값이 포함되어 있습니다. 이 데이터 세트는 NOAA AVHRR 표면 반사율 제품에서 파생되었으며 일별로 0.05° 해상도로 그리드화됩니다. 이 값은 육지 표면에서 전역적으로 계산되지만, 노출되거나 식물이 매우 희박한 지역, 영구적인 얼음이나 눈, 영구적인 습지, 도시 지역 또는 수역에서는 계산되지 않습니다.
제공업체 참고: AVHRR 센서를 탑재한 마지막 NOAA 위성인 N-19의 궤도 드리프트로 인해 검색된 제품 품질이 심각하게 저하되기 시작했습니다. 따라서 2014년부터 현재까지 이러한 제품에 사용되는 기본 센서는 VIIRS입니다.
대역
픽셀 크기 5566미터
대역
이름
최소
최대
확장
픽셀 크기
설명
LAI
0*
6205*
0.001
미터
잎 면적 지수
FAPAR
0*
896*
0.001
미터
흡수된 광합성 활성 방사선의 비율
QA
미터
품질 관리 비트 플래그
QA용 비트 마스크
비트 0~1: 품질 관리
0: Ok
1: 흐림으로 플래그 지정
2: 잘못된 입력
3: 출력이 범위를 벗어남
비트 2~4: 연결된 클래스
1: 침엽수림
2: 활엽수림
4: 초원 및 농경지, 식물이 없는 지역
5: 상록수 활엽수림
6: 물
비트 5: BRDF 보정
0: 아니요
1: 예
비트 6~7: 다각형 테스트
0: 다각형 내
1: 다각형에 없음
2: 테스트하지 않음 (물/흐림)
* 예상 최솟값 또는 최댓값
이미지 속성
이미지 속성
이름
유형
설명
상태
문자열
'provisional' 또는 'permanent'
이용약관
이용약관
CDR의 NOAA CDR 프로그램 공식 배포 지점은 NOAA의 국립 기후 데이터 센터입니다. 이 센터는 대통령의 '공개 데이터 정책'에 관한 메모에 설명되어 있고 2013년 5월 9일의 행정 명령 '정부 정보의 새로운 기본값으로 공개 및 기계 판독 가능 설정'에 따라 미국의 공개 데이터 정책 및 관행을 준수하여 CDR 패키지 및 관련 정보에 대한 지속적이고 개방적인 액세스와 적극적인 데이터 관리를 제공합니다. 이러한 정책에 따라 CDR 데이터 세트는 독점적이지 않고 공개적으로 제공되며 사용에 제한이 없습니다. 자세한 내용은 NOAA의 CDR 데이터 세트, 알고리즘, 문서의 공정 사용 PDF를 참고하세요.
인용
인용:
Martin Claverie, Eric Vermote, NOAA CDR Program (2014): NOAA Climate Data Record (CDR) of Leaf Area Index (LAI) and Fraction of Absorbed Photosynthetically Active Radiation (FAPAR), 버전 4. [사용된 하위 집합을 나타냅니다]. NOAA National Climatic Data Center.
doi:10.7289/V5M043BX
AVHRR 잎 면적 지수 (LAI) 및 광합성 활성 방사선 흡수 비율 (FAPAR) 데이터세트의 NOAA 기후 데이터 기록 (CDR)에는 식물의 수관 및 광합성 활동을 특징짓는 파생 값이 포함되어 있습니다. 이 데이터 세트는 NOAA AVHRR 표면 반사율 제품에서 파생되었으며 … 해상도로 그리드화됩니다.
[null,null,[],[[["\u003cp\u003eThe NOAA CDR AVHRR LAI FAPAR dataset provides daily global estimations of Leaf Area Index (LAI) and Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) at a 0.05° resolution.\u003c/p\u003e\n"],["\u003cp\u003eIt covers the period from June 24, 1981, to December 31, 2013, and is derived from the NOAA AVHRR Surface Reflectance product.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset characterizes the canopy and photosynthetic activity of plants over land surfaces, excluding bare areas, ice, snow, permanent wetlands, urban areas, and water bodies.\u003c/p\u003e\n"],["\u003cp\u003eKnown issues exist, such as inaccuracies in the TIMEOFDAY variable and slight geolocation errors for latitude and longitude values.\u003c/p\u003e\n"],["\u003cp\u003eData is freely available for use with no restrictions, as per NOAA's open data policies.\u003c/p\u003e\n"]]],["The NOAA CDR AVHRR dataset provides daily measurements of Leaf Area Index (LAI) and Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) from 1981-06-24 to 2013-12-31. Derived from NOAA AVHRR Surface Reflectance, data characterizes canopy and plant photosynthetic activity, gridded at 0.05° resolution over land, excluding sparsely vegetated areas, ice, snow, wetlands, urban areas, and water. The data is accessible through Earth Engine using the code `ee.ImageCollection(\"NOAA/CDR/AVHRR/LAI_FAPAR/V5\")`.\n"],null,["# NOAA CDR AVHRR LAI FAPAR: Leaf Area Index and Fraction of Absorbed Photosynthetically Active Radiation, Version 5\n\nDataset Availability\n: 1981-06-24T00:00:00Z--2013-12-31T00:00:00Z\n\nDataset Provider\n:\n\n\n [NOAA](https://www.ncei.noaa.gov/products/climate-data-records/leaf-area-index-and-fapar)\n\nCadence\n: 1 Day\n\nTags\n:\n[avhrr](/earth-engine/datasets/tags/avhrr) [cdr](/earth-engine/datasets/tags/cdr) [daily](/earth-engine/datasets/tags/daily) [fapar](/earth-engine/datasets/tags/fapar) [lai](/earth-engine/datasets/tags/lai) [land](/earth-engine/datasets/tags/land) [noaa](/earth-engine/datasets/tags/noaa) [plant-productivity](/earth-engine/datasets/tags/plant-productivity) \n\n#### Description\n\nThe NOAA Climate Data Record (CDR) of AVHRR Leaf Area Index (LAI) and\nFraction of Absorbed Photosynthetically Active Radiation (FAPAR) dataset\ncontains derived values that characterize the canopy and photosynthetic\nactivity of plants. This dataset is derived from the NOAA AVHRR Surface\nReflectance product and is gridded at a resolution of 0.05° on a daily\nbasis. The values are computed globally over land surfaces, but not over\nbare or very sparsely vegetated areas, permanent ice or snow, permanent\nwetland, urban areas, or water bodies.\n\nKnown issues with this dataset include:\n\n- TIMEOFDAY variable contains values that are too large by 1 day\n\n- Latitude values are not correctly associated with the center of\n the grid cell, error is \\\u003c 0.002 degrees\n\n- Longitude values are not correctly associated with the center of\n the grid cell, error is \\\u003c 0.02 degrees\n\nSee [technical note from the data provider](https://www.ncei.noaa.gov/pub/data/sds/cdr/CDRs/Leaf_Area_Index_and_FAPAR/AVHRR/AlgorithmDescriptionAVHRR_01B-20c.pdf).\n\nProvider's note: the orbital drift of N-19 (the last NOAA satellite\ncarrying the AVHRR sensor) began to severely degrade the retrieved\nproduct quality. Therefore, VIIRS is now the primary sensor being used for\nthese products from 2014-present.\n\n### Bands\n\n\n**Pixel Size**\n\n5566 meters\n\n**Bands**\n\n| Name | Min | Max | Scale | Pixel Size | Description |\n|---------|-----|--------|-------|------------|------------------------------------------------------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|\n| `LAI` | 0\\* | 6205\\* | 0.001 | meters | Leaf area index |\n| `FAPAR` | 0\\* | 896\\* | 0.001 | meters | Fraction of absorbed photosynthetic active radiation |\n| `QA` | | | | meters | Quality control bit flags |\n| Bitmask for QA - Bits 0-1: Quality control - 0: Ok - 1: Input flags as cloudy - 2: Invalid input - 3: Output out of range - Bits 2-4: Associated class - 1: Needleleaf forest - 2: Broadleaf forest - 4: Grassland \\& croplands \\& non vegetated - 5: Evergreen broadleaf forest - 6: Water - Bit 5: BRDF corrected - 0: No - 1: Yes - Bits 6-7: Polygon test - 0: In polygon - 1: Not in polygon - 2: Not tested (water/cloudy) ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||\n\n\\* estimated min or max value\n\n### Image Properties\n\n**Image Properties**\n\n| Name | Type | Description |\n|--------|--------|------------------------------|\n| status | STRING | 'provisional' or 'permanent' |\n\n### Terms of Use\n\n**Terms of Use**\n\nThe NOAA CDR Program's official distribution point for CDRs is NOAA's\nNational Climatic Data Center which provides sustained, open access and\nactive data management of the CDR packages and related information in\nkeeping with the United States' open data policies and practices as\ndescribed in the President's Memorandum on \"Open Data Policy\" and pursuant\nto the Executive Order of May 9, 2013, \"Making Open and Machine Readable\nthe New Default for Government Information\". In line with these policies,\nthe CDR data sets are nonproprietary, publicly available, and no\nrestrictions are placed upon their use. For more information, see the\n[Fair Use of NOAA's CDR Data Sets, Algorithms and Documentation](https://www1.ncdc.noaa.gov/pub/data/sds/cdr/CDRs/Aerosol_Optical_Thickness/UseAgreement_01B-04.pdf)\npdf.\n\n### Citations\n\nCitations:\n\n- Martin Claverie, Eric Vermote, and NOAA CDR Program (2014): NOAA Climate\n Data Record (CDR) of Leaf Area Index (LAI) and Fraction of Absorbed\n Photosynthetically Active Radiation (FAPAR), Version 4. \\[indicate subset\n used\\]. NOAA National Climatic Data Center.\n [doi:10.7289/V5M043BX](https://data.nodc.noaa.gov/cgi-bin/iso?id=gov.noaa.ncdc:C00898)\n\n### DOIs\n\n- \u003chttps://doi.org/10.7289/V5M043BX\u003e\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.ImageCollection('NOAA/CDR/AVHRR/LAI_FAPAR/V5')\n .filter(ee.Filter.date('2018-02-01', '2018-03-01'));\nvar leafAreaIndex = dataset.select('LAI');\nvar leafAreaIndexVis = {\n min: 0.0,\n max: 4000.0,\n palette: ['3b0200', '977705', 'ca9f06', 'ffca09', '006a03', '003b02'],\n};\nMap.setCenter(20, 24.5, 2);\nMap.addLayer(leafAreaIndex, leafAreaIndexVis, 'Leaf Area Index');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NOAA/NOAA_CDR_AVHRR_LAI_FAPAR_V5) \n[NOAA CDR AVHRR LAI FAPAR: Leaf Area Index and Fraction of Absorbed Photosynthetically Active Radiation, Version 5](/earth-engine/datasets/catalog/NOAA_CDR_AVHRR_LAI_FAPAR_V5) \nThe NOAA Climate Data Record (CDR) of AVHRR Leaf Area Index (LAI) and Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) dataset contains derived values that characterize the canopy and photosynthetic activity of plants. This dataset is derived from the NOAA AVHRR Surface Reflectance product and is gridded at a resolution ... \nNOAA/CDR/AVHRR/LAI_FAPAR/V5, avhrr,cdr,daily,fapar,lai,land,noaa,plant-productivity \n1981-06-24T00:00:00Z/2013-12-31T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.7289/V5M043BX](https://doi.org/https://www.ncei.noaa.gov/products/climate-data-records/leaf-area-index-and-fapar)\n- [https://doi.org/10.7289/V5M043BX](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NOAA_CDR_AVHRR_LAI_FAPAR_V5)"]]
