Zbiór danych NOAA Climate Data Record (CDR) of AVHRR Leaf Area Index (LAI) and Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) zawiera wartości pochodne, które charakteryzują pokrywę roślinną i aktywność fotosyntetyczną roślin. Ten zbiór danych pochodzi z produktu NOAA AVHRR Surface Reflectance i jest podzielony na siatkę o rozdzielczości 0,05° w skali dziennej. Wartości są obliczane globalnie na powierzchniach lądowych, ale nie na obszarach bez roślinności lub z bardzo rzadką roślinnością, na obszarach pokrytych stałym lodem lub śniegiem, na obszarach podmokłych, na obszarach miejskich ani na zbiornikach wodnych.
Znane problemy z tym zbiorem danych:
Zmienna TIMEOFDAY zawiera wartości, które są o 1 dzień za duże
Wartości szerokości geograficznej nie są prawidłowo powiązane ze środkiem komórki siatki, błąd wynosi < 0,002 stopnia
Wartości długości geograficznej nie są prawidłowo powiązane ze środkiem komórki siatki, błąd jest mniejszy niż 0,02 stopnia.
Uwaga dostawcy: dryf orbitalny satelity N-19 (ostatniego satelity NOAA z sensorem AVHRR) zaczął poważnie pogarszać jakość pobieranych danych. Dlatego od 2014 r. VIIRS jest głównym czujnikiem używanym do tworzenia tych produktów.
Oficjalnym punktem dystrybucji CDR w ramach programu NOAA CDR jest Narodowe Centrum Danych Klimatycznych NOAA, które zapewnia stały, otwarty dostęp i aktywne zarządzanie pakietami CDR oraz powiązanymi informacjami zgodnie z polityką i praktykami Stanów Zjednoczonych w zakresie otwartych danych, opisanymi w memorandum prezydenta w sprawie „Polityki otwartych danych” oraz zgodnie z rozporządzeniem wykonawczym z 9 maja 2013 r. „Uczynienie otwartych i czytelnych dla maszyn nowych domyślnych informacji rządowych”. Zgodnie z tymi zasadami zbiory danych CDR nie są objęte prawem własności, są publicznie dostępne i nie podlegają żadnym ograniczeniom w zakresie ich wykorzystywania. Więcej informacji znajdziesz w dokumencie Fair Use of NOAA's CDR Data Sets, Algorithms and Documentation (pdf).
Cytaty
Cytowania:
Martin Claverie, Eric Vermote i NOAA CDR Program (2014): NOAA Climate
Data Record (CDR) of Leaf Area Index (LAI) and Fraction of Absorbed
Photosynthetically Active Radiation (FAPAR), Version 4. [indicate subset
used]. NOAA National Climatic Data Center.
doi:10.7289/V5M043BX
Zbiór danych NOAA Climate Data Record (CDR) of AVHRR Leaf Area Index (LAI) and Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) zawiera wartości pochodne, które charakteryzują pokrywę roślinną i aktywność fotosyntetyczną roślin. Ten zbiór danych pochodzi z produktu NOAA AVHRR Surface Reflectance i jest podzielony na siatkę o rozdzielczości …
[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)"]]
