Le produit MYD17A3HGF V6.1 fournit des informations sur la productivité primaire brute et nette annuelles (PPB et PPN) à une résolution de 500 mètres par pixel. La NPP annuelle est calculée à partir de la somme de tous les produits de photosynthèse nette(PSN) de huit jours (MYD17A2H) de l'année concernée. La valeur PSN correspond à la différence entre la productivité primaire brute (PPB) et la respiration d'entretien (RE) (PPB-RE).
Bracelets
Taille des pixels 500 mètres
Bandes de fréquences
Nom
Unités
Min
Max
Échelle
Taille des pixels
Description
Gpp
kg*C/m^2
0
65500
0,0001
mètres
Productivité primaire brute
Npp
kg*C/m^2
-30000
32700
0,0001
mètres
Productivité primaire nette
Npp_QC
%
0
100
mètres
Pourcentage de contrôle qualité
Conditions d'utilisation
Conditions d'utilisation
Les données et produits MODIS acquis via le LP DAAC ne sont soumis à aucune restriction concernant leur utilisation, leur vente ou leur redistribution ultérieures.
Citations
Citations :
Pour savoir comment citer les ensembles de données LP DAAC, consultez la page Citing Our Data (Citer nos données).
Le produit MYD17A3HGF V6.1 fournit des informations sur la productivité primaire brute et nette (PPB et PPN) annuelles à une résolution de 500 m par pixel. La NPP annuelle est obtenue en additionnant tous les produits de photosynthèse nette(PSN) de huit jours (MYD17A2H) de l'année concernée. La valeur PSN correspond à la différence entre la production primaire brute (PPB)…
[null,null,[],[[["\u003cp\u003eThe MODIS/061/MYD17A3HGF V6.1 product provides annual Gross and Net Primary Productivity (GPP and NPP) data at a 500m resolution.\u003c/p\u003e\n"],["\u003cp\u003eNPP is calculated from the sum of 8-day Net Photosynthesis (PSN) values, derived from GPP minus Maintenance Respiration (MR).\u003c/p\u003e\n"],["\u003cp\u003eThe dataset covers the period from 2001-01-01 to 2023-01-01 and is provided by NASA LP DAAC at the USGS EROS Center.\u003c/p\u003e\n"],["\u003cp\u003eData is freely available for use, sale, and redistribution with proper citation.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset can be accessed and analyzed using Google Earth Engine.\u003c/p\u003e\n"]]],["The dataset, MODIS/061/MYD17A3HGF, from NASA LP DAAC at the USGS EROS Center, provides annual Gross and Net Primary Productivity (GPP and NPP) data at a 500m resolution from 2001-2024. NPP is calculated annually by summing 8-day Net Photosynthesis values. Data can be accessed via the Earth Engine using the provided code snippet. The dataset has no usage restrictions and includes bands for GPP, NPP, and quality control.\n"],null,["# MYD17A3HGF.061: Aqua Net Primary Production Gap-Filled Yearly Global 500m\n\nDataset Availability\n: 2001-01-01T00:00:00Z--2024-01-01T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA LP DAAC at the USGS EROS Center](https://doi.org/10.5067/MODIS/MYD17A3HGF.061)\n\nCadence\n: 1 Year\n\nTags\n:\n[aqua](/earth-engine/datasets/tags/aqua) [global](/earth-engine/datasets/tags/global) [gpp](/earth-engine/datasets/tags/gpp) [nasa](/earth-engine/datasets/tags/nasa) [npp](/earth-engine/datasets/tags/npp) [photosynthesis](/earth-engine/datasets/tags/photosynthesis) [plant-productivity](/earth-engine/datasets/tags/plant-productivity) [productivity](/earth-engine/datasets/tags/productivity) [psn](/earth-engine/datasets/tags/psn) [usgs](/earth-engine/datasets/tags/usgs) [yearly](/earth-engine/datasets/tags/yearly) \n\n#### Description\n\nThe MYD17A3HGF V6.1 product provides information about annual Gross and Net\nPrimary Productivity (GPP and NPP) at 500m pixel resolution. Annual NPP is\nderived from the sum of all 8-day Net Photosynthesis(PSN) products\n(MYD17A2H) from the given year. The PSN value is the difference of the\nGross Primary Productivity (GPP) and the Maintenance Respiration (MR)\n(GPP-MR).\n\n### Bands\n\n\n**Pixel Size**\n\n500 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Scale | Pixel Size | Description |\n|----------|------------|--------|-------|--------|------------|----------------------------|\n| `Gpp` | kg\\*C/m\\^2 | 0 | 65500 | 0.0001 | meters | Gross primary productivity |\n| `Npp` | kg\\*C/m\\^2 | -30000 | 32700 | 0.0001 | meters | Net primary productivity |\n| `Npp_QC` | % | 0 | 100 | | meters | Quality control percentage |\n\n### Terms of Use\n\n**Terms of Use**\n\nMODIS data and products acquired through the LP DAAC\nhave no restrictions on subsequent use, sale, or redistribution.\n\n### Citations\n\nCitations:\n\n- Please visit [LP DAAC 'Citing Our Data' page](https://lpdaac.usgs.gov/citing_our_data)\n for information on citing LP DAAC datasets.\n\n### DOIs\n\n- \u003chttps://doi.org/10.5067/MODIS/MYD17A3HGF.061\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('MODIS/061/MYD17A3HGF');\n\nvar visualization = {\n bands: ['Npp'],\n min: 0.0,\n max: 19000.0,\n palette: ['bbe029', '0a9501', '074b03']\n};\n\nMap.centerObject(dataset);\n\nMap.addLayer(dataset, visualization, 'NPP');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/MODIS/MODIS_061_MYD17A3HGF) \n[MYD17A3HGF.061: Aqua Net Primary Production Gap-Filled Yearly Global 500m](/earth-engine/datasets/catalog/MODIS_061_MYD17A3HGF) \nThe MYD17A3HGF V6.1 product provides information about annual Gross and Net Primary Productivity (GPP and NPP) at 500m pixel resolution. Annual NPP is derived from the sum of all 8-day Net Photosynthesis(PSN) products (MYD17A2H) from the given year. The PSN value is the difference of the Gross Primary Productivity (GPP) ... \nMODIS/061/MYD17A3HGF, aqua,global,gpp,nasa,npp,photosynthesis,plant-productivity,productivity,psn,usgs,yearly \n2001-01-01T00:00:00Z/2024-01-01T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.5067/MODIS/MYD17A3HGF.061](https://doi.org/https://doi.org/10.5067/MODIS/MYD17A3HGF.061)\n- [https://doi.org/10.5067/MODIS/MYD17A3HGF.061](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/MODIS_061_MYD17A3HGF)"]]
