Das Produkt MOD17A2HGF Version 6.1 für die primäre Brutto-Primärproduktion (Gross Primary Productivity, GPP) ist ein kumulatives 8‑Tages-Composite von Werten mit einer Pixelgröße von 500 Metern (m), das auf dem Konzept der Strahlungsnutzungseffizienz basiert und potenziell als Eingabe für Datenmodelle verwendet werden kann, um terrestrische Energie-, Kohlenstoff- und Wasserkreislaufprozesse sowie die Biogeochemie der Vegetation zu berechnen.
Nettophotosynthese; GPP minus die Atmung zur Aufrechterhaltung (MR)
Psn_QC
Meter
Qualitätskontrollbits
Bitmaske für Psn_QC
Bit 0: MODLAND-QC-Bits
0: Gute Qualität
1: Sonstige Qualität
Bit 1: Sensor
0: Terra
1: Aqua
Bit 2: Dead-Detektor
0: Detektoren scheinbar in Ordnung für bis zu 50% der Kanäle 1 und 2
1: Durch defekte Detektoren wurden mehr als 50% der benachbarten Detektoren abgerufen.
Bits 3–4: Cloud-Status
0: Keine signifikanten Wolken vorhanden (klar)
1: Es waren erhebliche Wolken vorhanden.
2. Gemischte Wolken auf dem Pixel
3: Cloud-Status nicht definiert, wird als „klar“ angenommen
Bits 5–7: 5-stufiger Konfidenz-Qualitätsfaktor
0: Sehr bestmöglich
1: Gut, sehr brauchbar, aber nicht das Beste
2: Minderwertig aufgrund von Geometrie-Problemen – mit Vorsicht verwenden
3: Unterdurchschnittlich aufgrund anderer Probleme als Geometrie – mit Vorsicht verwenden
4: Pixel konnte nicht abgerufen werden (NICHT ERSTELLT – nicht terrestrisches Biom)
7. Füllwert
Nutzungsbedingungen
Nutzungsbedingungen
Für MODIS-Daten und ‑Produkte, die über das LP DAAC bezogen werden, gelten keine Einschränkungen hinsichtlich der weiteren Verwendung, des Verkaufs oder der Weitergabe.
Das Produkt MOD17A2HGF Version 6.1 Gross Primary Productivity (GPP) ist ein kumulatives 8‑Tages-Composite von Werten mit einer Pixelgröße von 500 Metern (m), das auf dem Konzept der Strahlungsnutzungseffizienz basiert und potenziell als Eingabe für Datenmodelle verwendet werden kann, um terrestrische Energie-, Kohlenstoff-, Wasserkreislaufprozesse und Biogeochemie von … zu berechnen.
[null,null,[],[[["\u003cp\u003eThe MOD17A2HGF V6.1 product provides an 8-day composite of Gross Primary Productivity (GPP) at 500m resolution, derived using the radiation use efficiency concept.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset, spanning from 2021-01-01 to 2023-12-27, offers insights into terrestrial energy, carbon, water cycles, and vegetation biogeochemistry.\u003c/p\u003e\n"],["\u003cp\u003eKey bands include GPP, Net Photosynthesis (PsnNet), and a quality control band (Psn_QC).\u003c/p\u003e\n"],["\u003cp\u003eData is freely available for use, sale, or redistribution with proper citation attributed to NASA LP DAAC at the USGS EROS Center.\u003c/p\u003e\n"],["\u003cp\u003eUsers can access and analyze the dataset via Google Earth Engine, with code snippets provided for seamless integration.\u003c/p\u003e\n"]]],["The MOD17A2HGF dataset, provided by NASA LP DAAC, offers an 8-day composite of Gross Primary Productivity (GPP) data at a 500-meter resolution, from 2021-01-01 to 2024-12-26. This dataset includes GPP, Net Photosynthesis, and Quality Control information, accessible via Google Earth Engine using the snippet `ee.ImageCollection(\"MODIS/061/MOD17A2HGF\")`. It calculates GPP based on radiation use efficiency and can be used to model terrestrial energy, carbon, and water cycles. The data is free to use and redistribute.\n"],null,["# MOD17A2HGF.061: Terra Gross Primary Productivity 8-Day Global 500m\n\nDataset Availability\n: 2021-01-01T00:00:00Z--2024-12-26T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA LP DAAC at the USGS EROS Center](https://doi.org/10.5067/MODIS/MOD17A2HGF.061)\n\nCadence\n: 8 Days\n\nTags\n:\n[8-day](/earth-engine/datasets/tags/8-day) [global](/earth-engine/datasets/tags/global) [gpp](/earth-engine/datasets/tags/gpp) [modis](/earth-engine/datasets/tags/modis) [nasa](/earth-engine/datasets/tags/nasa) [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) \n\n#### Description\n\nThe MOD17A2HGF Version 6.1 Gross Primary Productivity (GPP) product\nis a cumulative 8-day composite of values with 500 meter (m) pixel size\nbased on the radiation use efficiency concept that can be potentially used\nas inputs to data models to calculate terrestrial energy, carbon,\nwater cycle processes, and biogeochemistry of vegetation.\n\nDocumentation:\n\n- [User's Guide](https://lpdaac.usgs.gov/documents/972/MOD17_User_Guide_V61.pdf)\n\n- [Algorithm Theoretical Basis Document (ATBD)](https://lpdaac.usgs.gov/documents/95/MOD17_ATBD.pdf)\n\n- [General Documentation](https://ladsweb.modaps.eosdis.nasa.gov/filespec/MODIS/6/MOD17A2HGF)\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 | 3000 | 0.0001 | meters | Gross primary production |\n| `PsnNet` | kg\\*C/m\\^2 | -3000 | 3000 | 0.0001 | meters | Net photosynthesis; GPP minus the maintenance respiration (MR) |\n| `Psn_QC` | | | | | meters | Quality control bits |\n| Bitmask for Psn_QC - Bit 0: MODLAND QC bits - 0: Good quality - 1: Other quality - Bit 1: Sensor - 0: Terra - 1: Aqua - Bit 2: Dead detector - 0: Detectors apparently fine for up to 50% of channels 1, 2 - 1: Dead detectors caused \\\u003e50% adjacent detector retrieval - Bits 3-4: Cloud state - 0: Significant clouds NOT present (clear) - 1: Significant clouds WERE present - 2: Mixed cloud present on pixel - 3: Cloud state not defined, assumed clear - Bits 5-7: 5-level confidence quality score - 0: Very best possible - 1: Good, very usable, but not the best - 2: Substandard due to geometry problems - use with caution - 3: Substandard due to other than geometry problems - use with caution - 4: Couldn't retrieve pixel (NOT PRODUCED AT ALL - non-terrestrial biome) - 7: Fill Value ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||\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/MOD17A2HGF.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/MOD17A2HGF')\n .filter(ee.Filter.date('2021-01-01', '2021-05-01'));\n\nvar gpp = dataset.select('Gpp');\nvar gppVis = {\n min: 0,\n max: 600,\n palette: ['bbe029', '0a9501', '074b03'],\n};\nMap.setCenter(6.746, 46.529, 2);\nMap.addLayer(gpp, gppVis, 'GPP');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/MODIS/MODIS_061_MOD17A2HGF) \n[MOD17A2HGF.061: Terra Gross Primary Productivity 8-Day Global 500m](/earth-engine/datasets/catalog/MODIS_061_MOD17A2HGF) \nThe MOD17A2HGF Version 6.1 Gross Primary Productivity (GPP) product is a cumulative 8-day composite of values with 500 meter (m) pixel size based on the radiation use efficiency concept that can be potentially used as inputs to data models to calculate terrestrial energy, carbon, water cycle processes, and biogeochemistry of ... \nMODIS/061/MOD17A2HGF, 8-day,global,gpp,modis,nasa,photosynthesis,plant-productivity,productivity,psn,terra,usgs \n2021-01-01T00:00:00Z/2024-12-26T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.5067/MODIS/MOD17A2HGF.061](https://doi.org/https://doi.org/10.5067/MODIS/MOD17A2HGF.061)\n- [https://doi.org/10.5067/MODIS/MOD17A2HGF.061](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/MODIS_061_MOD17A2HGF)"]]
