Catatan Data Iklim (CDR) ini menggabungkan set data untuk Indeks Area Daun (LAI) dan Fraksi Radiasi Fotosintetik Aktif yang Diserap (FAPAR), dua variabel biofisik yang dapat digunakan untuk mengevaluasi tekanan vegetasi, memperkirakan hasil pertanian, dan aplikasi pemodelan serta pengelolaan sumber daya lainnya. LAI melacak area daun hijau satu sisi per unit luas permukaan tanah, sedangkan FAPAR mengukur radiasi matahari yang diserap oleh tanaman dalam wilayah spektral radiasi aktif fotosintetik (PAR).
CDR LAI/FAPAR menghasilkan produk harian pada petak 0,05° x 0,05°.
Data dihasilkan dari sensor Visible Infrared Imaging Radiometer Suite (VIIRS) sejak tahun 2014 dan seterusnya.
Masalah umum pada set data ini meliputi:
Variabel TIMEOFDAY berisi nilai yang terlalu besar sebanyak 1 hari
Nilai lintang tidak dikaitkan dengan benar dengan pusat sel petak, error < 0,002 derajat
Nilai bujur tidak dikaitkan dengan benar dengan pusat sel petak, error < 0,02 derajat
Catatan penyedia: pergeseran orbital N-19 (satelit NOAA terakhir yang membawa sensor AVHRR) mulai menurunkan kualitas produk yang diambil secara signifikan. Oleh karena itu, VIIRS kini menjadi sensor utama yang digunakan untuk produk-produk ini sejak tahun 2014 hingga saat ini.
Band
Ukuran Piksel 5566 meter
Band
Nama
Min
Maks
Skala
Ukuran Piksel
Deskripsi
LAI
0*
6205*
0,001
meter
Indeks luas daun
FAPAR
0*
896*
0,001
meter
Fraksi radiasi aktif fotosintetik yang diserap
QA
meter
Flag bit kontrol kualitas
Bitmask untuk QA
Bit 0-1: Kontrol kualitas
0: Oke
1: Masukkan bendera sebagai berawan
2: Input tidak valid
3: Output di luar rentang
Bit 2-4: Class terkait
1: Hutan berdaun jarum
2: Hutan berdaun lebar
4: Padang rumput & lahan pertanian & tidak bervegetasi
5: Hutan berdaun lebar hijau
6: Air
Bit 5: BRDF yang dikoreksi
0: Tidak
1: Ya
Bit 6-7: Pengujian poligon
0: Dalam poligon
1: Tidak dalam poligon
2: Tidak diuji (berair/berawan)
* perkiraan nilai min atau maks
Properti Gambar
Properti Gambar
Nama
Jenis
Deskripsi
status
STRING
'provisional' atau 'permanent'
Persyaratan Penggunaan
Persyaratan Penggunaan
Titik distribusi resmi Program CDR NOAA untuk CDR adalah National Climatic Data Center NOAA yang menyediakan akses terbuka berkelanjutan dan pengelolaan data aktif paket CDR dan informasi terkait sesuai dengan kebijakan dan praktik data terbuka Amerika Serikat sebagaimana dijelaskan dalam Memorandum Presiden tentang "Kebijakan Data Terbuka" dan sesuai dengan Perintah Eksekutif 9 Mei 2013, "Menjadikan Data Terbuka dan yang Dapat Dibaca Mesin sebagai Standar Baru untuk Informasi Pemerintah". Sesuai dengan kebijakan ini, set data CDR bersifat tidak berpemilik, tersedia secara publik, dan tidak ada batasan yang diberlakukan atas penggunaannya. Untuk mengetahui informasi selengkapnya, lihat PDF
Penggunaan yang Wajar atas Set Data, Algoritma, dan Dokumentasi CDR NOAA.
Kutipan
Kutipan:
Kutip sebagai: Claverie, Martin; Vermote, Eric; Justice, Chris; Csiszar, Ivan;
Myneni, Ranga; Baret, Frederic; Masuoka, Ed; Wolfe, Robert; Ray, James P.;
Program CDR NOAA. (2023): NOAA Climate Data Record (CDR) of VIIRS Leaf Area Index (LAI) and Fraction of Absorbed Photosynthetically Active Radiation (FAPAR), Versi 1. [tunjukkan subset yang digunakan]. NOAA National Centers for
Environmental Information. https://doi.org/10.25921/9x3m-0e02.
Climate Data Record (CDR) ini menggabungkan set data untuk Indeks Luas Daun (LAI) dan Fraksi Radiasi Fotosintetik Aktif yang Diserap (FAPAR), dua variabel biofisik yang dapat digunakan untuk mengevaluasi tekanan vegetasi, memperkirakan hasil pertanian, dan aplikasi pemodelan serta pengelolaan sumber daya lainnya. LAI melacak area daun hijau satu sisi per unit …
[null,null,[],[[["\u003cp\u003eThis dataset, provided by NOAA, offers a Climate Data Record (CDR) of daily Leaf Area Index (LAI) and Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) data from 2014 to 2025.\u003c/p\u003e\n"],["\u003cp\u003eThe LAI and FAPAR data, derived from VIIRS sensors, are valuable for assessing vegetation stress, forecasting agricultural output, and other land-based modeling applications.\u003c/p\u003e\n"],["\u003cp\u003eThe data is provided on a 0.05° by 0.05° grid, with each pixel representing 5566 meters.\u003c/p\u003e\n"],["\u003cp\u003eUsers can explore and analyze this dataset using Google Earth Engine, accessing it through the \u003ccode\u003eee.ImageCollection("NOAA/CDR/VIIRS/LAI_FAPAR/V1")\u003c/code\u003e snippet.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset is open access, and available under NOAA's open data policy, and there are some minor known issues with the dataset, including issues with the \u003ccode\u003eTIMEOFDAY\u003c/code\u003e, Latitude, and Longitude variables.\u003c/p\u003e\n"]]],[],null,["Dataset Availability\n: 2014-01-01T00:00:00Z--2025-08-22T00:00:00Z\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[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) [viirs](/earth-engine/datasets/tags/viirs) \n\nDescription \nThis Climate Data Record (CDR) combines datasets for Leaf Area Index (LAI)\nand Fraction of Absorbed Photosynthetically Active Radiation (FAPAR), two\nbiophysical variables that can be used to evaluate vegetation stress,\nforecast agricultural yields, and other modeling and resource management\napplications. LAI tracks the one-sided green leaf area per unit of ground\nsurface area, while FAPAR quantifies the solar radiation absorbed by plants\nwithin the photosynthetically active radiation (PAR) spectral region.\nThe LAI/FAPAR CDR generates a daily product on a .05° by .05° grid.\nThe data is generated from the Visible Infrared Imaging Radiometer Suite\n(VIIRS) sensors from 2014 onward.\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/VIIRS/AlgorithmDescriptionVIIRS_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\nBands\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\nImage Properties\n\n**Image Properties**\n\n| Name | Type | Description |\n|--------|--------|------------------------------|\n| status | STRING | 'provisional' or 'permanent' |\n\nTerms 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\nCitations \nCitations:\n\n- Cite as: Claverie, Martin; Vermote, Eric; Justice, Chris; Csiszar, Ivan;\n Myneni, Ranga; Baret, Frederic; Masuoka, Ed; Wolfe, Robert; Ray, James P.;\n NOAA CDR Program. (2023): NOAA Climate Data Record (CDR) of VIIRS Leaf Area\n Index (LAI) and Fraction of Absorbed Photosynthetically Active Radiation\n (FAPAR), Version 1. \\[indicate subset used\\]. NOAA National Centers for\n Environmental Information. [https://doi.org/10.25921/9x3m-0e02](https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ncdc:C01706/html).\n\nDOIs\n\n- \u003chttps://doi.org/10.25921/9x3m-0e02\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('NOAA/CDR/VIIRS/LAI_FAPAR/V1')\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_VIIRS_LAI_FAPAR_V1) \n[NOAA CDR VIIRS LAI FAPAR: Leaf Area Index and Fraction of Absorbed Photosynthetically Active Radiation, Version 1](/earth-engine/datasets/catalog/NOAA_CDR_VIIRS_LAI_FAPAR_V1) \nThis Climate Data Record (CDR) combines datasets for Leaf Area Index (LAI) and Fraction of Absorbed Photosynthetically Active Radiation (FAPAR), two biophysical variables that can be used to evaluate vegetation stress, forecast agricultural yields, and other modeling and resource management applications. LAI tracks the one-sided green leaf area per unit ... \nNOAA/CDR/VIIRS/LAI_FAPAR/V1, cdr,daily,fapar,lai,land,noaa,plant-productivity,viirs \n2014-01-01T00:00:00Z/2025-08-22T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.25921/9x3m-0e02](https://doi.org/https://www.ncei.noaa.gov/products/climate-data-records/leaf-area-index-and-fapar)\n- [https://doi.org/10.25921/9x3m-0e02](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NOAA_CDR_VIIRS_LAI_FAPAR_V1)"]]
