Kumpulan data NOAA Climate Data Record (CDR) AVHRR Leaf Area Index (LAI) dan Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) berisi nilai turunan yang mencirikan kanopi dan aktivitas fotosintetik tanaman. Kumpulan data ini berasal dari produk Reflektansi Permukaan AVHRR NOAA dan di-grid pada resolusi 0,05° setiap hari. Nilai dihitung secara global di atas permukaan tanah, tetapi tidak di atas area yang gundul atau sangat jarang ditumbuhi vegetasi, es atau salju permanen, lahan basah permanen, area perkotaan, atau badan air.
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, errornya < 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 Default 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:
Martin Claverie, Eric Vermote, dan NOAA CDR Program (2014): NOAA Climate Data Record (CDR) of Leaf Area Index (LAI) and Fraction of Absorbed Photosynthetically Active Radiation (FAPAR), Versi 4. [indicate subset
used]. NOAA National Climatic Data Center.
doi:10.7289/V5M043BX
Kumpulan data NOAA Climate Data Record (CDR) dari AVHRR Leaf Area Index (LAI) dan Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) berisi nilai turunan yang mencirikan kanopi dan aktivitas fotosintetik tanaman. Kumpulan data ini berasal dari produk NOAA AVHRR Surface Reflectance dan di-grid pada resolusi …
[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)"]]
