محصول MOD17A3HGF V6.1 اطلاعاتی در مورد بهره وری اولیه ناخالص و خالص سالانه (GPP و NPP) با وضوح 500 متر پیکسل ارائه می دهد. NPP سالانه از مجموع تمام محصولات فتوسنتز خالص 8 روزه (PSN) (MOD17A2H) از سال معین به دست می آید. مقدار PSN تفاوت بهره وری ناخالص اولیه (GPP) و تنفس تعمیر و نگهداری (MR) (GPP-MR) است.
باندها
اندازه پیکسل 500 متر
باندها
نام
واحدها
حداقل
حداکثر
مقیاس
اندازه پیکسل
توضیحات
Gpp
kg*C/m^2
0
65500
0.0001
متر
بهره وری ناخالص اولیه
Npp
kg*C/m^2
-30000
32700
0.0001
متر
بهره وری اولیه خالص
Npp_QC
%
0
100
متر
درصد کنترل کیفیت
شرایط استفاده
شرایط استفاده
داده‌های MODIS و محصولات به‌دست‌آمده از طریق LP DAAC هیچ محدودیتی در استفاده، فروش یا توزیع مجدد بعدی ندارند.
محصول MOD17A3HGF V6.1 اطلاعاتی در مورد بهره وری اولیه ناخالص و خالص سالانه (GPP و NPP) با وضوح 500 متر پیکسل ارائه می دهد. NPP سالانه از مجموع تمام محصولات فتوسنتز خالص 8 روزه (PSN) (MOD17A2H) از سال معین به دست می آید. مقدار PSN تفاوت بهره وری ناخالص اولیه (GPP) است…
[null,null,[],[[["\u003cp\u003eThe MOD17A3HGF V6.1 product provides annual Gross and Net Primary Productivity (GPP and NPP) data at 500m resolution.\u003c/p\u003e\n"],["\u003cp\u003eNPP is calculated from the sum of 8-day Net Photosynthesis (PSN) values, which are derived from GPP and Maintenance Respiration (MR).\u003c/p\u003e\n"],["\u003cp\u003eThe dataset covers the period from 2001 to 2023 and is available globally.\u003c/p\u003e\n"],["\u003cp\u003eData is freely accessible for use, sale, and redistribution with proper citation to the LP DAAC.\u003c/p\u003e\n"],["\u003cp\u003eEarth Engine provides tools for analyzing and visualizing this dataset.\u003c/p\u003e\n"]]],["The MOD17A3HGF V6.1 dataset, provided by NASA LP DAAC, offers annual Gross and Net Primary Productivity (GPP and NPP) data from 2001 to 2024, at a 500m resolution. NPP is calculated from 8-day Net Photosynthesis (PSN) products (GPP-MR). The data includes `Gpp`, `Npp`, and `Npp_QC` bands. It is accessible through Google Earth Engine using the code snippet `ee.ImageCollection(\"MODIS/061/MOD17A3HGF\")`. Data is free for use, sale, or redistribution.\n"],null,["# MOD17A3HGF.061: Terra 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/MOD17A3HGF.061)\n\nCadence\n: 1 Year\n\nTags\n:\n[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) [terra](/earth-engine/datasets/tags/terra) [usgs](/earth-engine/datasets/tags/usgs) [yearly](/earth-engine/datasets/tags/yearly) \n\n#### Description\n\nThe MOD17A3HGF 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(MOD17A2H) 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/MOD17A3HGF.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/MOD17A3HGF');\n\nvar visualization = {\n bands: ['Npp'],\n min: 0,\n max: 19000,\n palette: ['bbe029', '0a9501', '074b03']\n};\n\nMap.setCenter(6.746, 46.529, 3);\n\nMap.addLayer(dataset, visualization, 'NPP');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/MODIS/MODIS_061_MOD17A3HGF) \n[MOD17A3HGF.061: Terra Net Primary Production Gap-Filled Yearly Global 500m](/earth-engine/datasets/catalog/MODIS_061_MOD17A3HGF) \nThe MOD17A3HGF 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 (MOD17A2H) from the given year. The PSN value is the difference of the Gross Primary Productivity (GPP) ... \nMODIS/061/MOD17A3HGF, global,gpp,nasa,npp,photosynthesis,plant-productivity,productivity,psn,terra,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/MOD17A3HGF.061](https://doi.org/https://doi.org/10.5067/MODIS/MOD17A3HGF.061)\n- [https://doi.org/10.5067/MODIS/MOD17A3HGF.061](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/MODIS_061_MOD17A3HGF)"]]
