La version finale "06" d'IMERG n'est plus produite depuis septembre 2021.
La version 07 devrait être publiée en septembre 2022.
La mission satellitaire internationale Global Precipitation Measurement (GPM) fournit des observations de nouvelle génération sur la pluie et la neige dans le monde entier toutes les trois heures. L'algorithme IMERG (Integrated Multi-satellitE Retrievals for GPM) est un algorithme unifié qui fournit des estimations des précipitations en combinant les données de tous les instruments micro-ondes passifs de la constellation GPM.
Cet algorithme est destiné à intercalibrer, fusionner et interpoler toutes les estimations des précipitations par satellite micro-ondes, ainsi que les estimations par satellite infrarouge (IR) calibrées par micro-ondes, les analyses des pluviomètres et potentiellement d'autres estimateurs de précipitations à des échelles temporelles et spatiales fines pour les époques TRMM et GPM sur l'ensemble du globe.
Le système est exécuté plusieurs fois pour chaque période d'observation, en fournissant d'abord une estimation rapide, puis des estimations plus précises à mesure que de nouvelles données arrivent. La dernière étape consiste à utiliser les données mensuelles des jauges pour créer des produits de niveau recherche. Pour en savoir plus sur l'algorithme, consultez la documentation technique IMERG.
Pondération des précipitations mesurées par les pluviomètres par rapport aux précipitations multisatellites
precipitation
mm/h
mètres
Estimation des précipitations combinant les données satellite et de pluviomètre
precipitationQualityIndex
Nombre de jauges équivalentes par boîte de 2,5 degrés
mètres
Indice de qualité pour le champ des précipitations
probabilityLiquidPrecipitation
%
mètres
Probabilité pondérée par l'accumulation de la phase de précipitation liquide
randomError
mm/h
mètres
Erreur aléatoire pour les précipitations combinées des satellites et des pluviomètres
Conditions d'utilisation
Conditions d'utilisation
Toutes les données produites par la NASA lors de la mission GPM sont mises à la disposition du public sans frais.
Citations
Citations :
Huffman, G.J., E.F. Stocker, D.T. Bolvin, E.J. Nelkin, Jackson Tan (2019),
GPM IMERG Final Precipitation L3 1 month 0.1 degree x 0.1 degree V06,
Greenbelt, MD, Goddard Earth Sciences Data and Information Services Center
(GES DISC), consulté le [date d'accès aux données], 10.5067/GPM/IMERG/3B-MONTH/06
La version finale "06" d'IMERG n'est plus produite depuis septembre 2021. La version 07 devrait être publiée en septembre 2022. La mission internationale GPM (Global Precipitation Measurement) vise à fournir des observations de nouvelle génération sur la pluie et la neige dans le monde entier toutes les trois heures. Les récupérations multisatellites intégrées pour GPM (IMERG) sont unifiées…
[null,null,[],[[["\u003cp\u003eThe GPM IMERG dataset provides global precipitation estimates every three hours, combining data from various satellites and gauges.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset covers the period from June 2000 to September 2021 with version "06" and has a spatial resolution of approximately 11km.\u003c/p\u003e\n"],["\u003cp\u003eIMERG uses a unified algorithm that intercalibrates, merges, and interpolates data to provide rainfall estimates at fine temporal and spatial scales.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset includes precipitation estimates, quality index, probability of liquid precipitation, random error, and gauge weighting information.\u003c/p\u003e\n"],["\u003cp\u003eNASA makes all GPM mission data freely available for public use.\u003c/p\u003e\n"]]],["The NASA GPM IMERG dataset, provided by NASA GES DISC, offers monthly global precipitation estimates from June 2000 to September 2021, with version 06 data. The IMERG algorithm combines satellite microwave and infrared data with gauge analyses to estimate rainfall and snow every three hours. The dataset includes bands like `precipitation` (mm/hr), `gaugeRelativeWeighting` (%) and `precipitationQualityIndex`. Data can be accessed and analyzed in the Earth Engine platform. The dataset has a pixel size of 11132 meters.\n"],null,["# GPM: Monthly Global Precipitation Measurement (GPM) v6\n\nDataset Availability\n: 2000-06-01T00:00:00Z--2021-09-01T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA GES DISC at NASA Goddard Space Flight Center](https://doi.org/10.5067/GPM/IMERG/3B-MONTH/06)\n\nCadence\n: 1 Month\n\nTags\n:\n[climate](/earth-engine/datasets/tags/climate) [geophysical](/earth-engine/datasets/tags/geophysical) [gpm](/earth-engine/datasets/tags/gpm) [imerg](/earth-engine/datasets/tags/imerg) [jaxa](/earth-engine/datasets/tags/jaxa) [monthly](/earth-engine/datasets/tags/monthly) [nasa](/earth-engine/datasets/tags/nasa) [precipitation](/earth-engine/datasets/tags/precipitation) [weather](/earth-engine/datasets/tags/weather) \n\n#### Description\n\nIMERG-Final version \"06\" stopped being produced in September, 2021.\nVersion \"07\" is expected to be released in September 2022\n\nGlobal Precipitation Measurement (GPM) is an international\nsatellite mission to provide next-generation observations of\nrain and snow worldwide every three hours. The Integrated Multi-satellitE\nRetrievals for GPM (IMERG) is the unified algorithm that provides\nrainfall estimates combining data from all passive-microwave\ninstruments in the GPM Constellation.\n\nThis algorithm is intended to intercalibrate, merge, and interpolate\nall satellite microwave precipitation estimates, together with\nmicrowave-calibrated infrared (IR) satellite estimates, precipitation\ngauge analyses, and potentially other precipitation estimators at fine\ntime and space scales for the TRMM and GPM eras over the entire globe.\nThe system is run several times for each observation time, first\ngiving a quick estimate and successively providing better estimates\nas more data arrive. The final step uses monthly gauge data to\ncreate research-level products. See [IMERG Technical Documentation](https://pmm.nasa.gov/sites/default/files/document_files/IMERG_doc.pdf)\nfor more details on the algorithm.\n\nDocumentation:\n\n- [Algorithm Theoretical Basis Document](https://docserver.gesdisc.eosdis.nasa.gov/public/project/GPM/IMERG_ATBD_V06.pdf)\n\n- [IMERG Quality Index](https://docserver.gesdisc.eosdis.nasa.gov/public/project/GPM/IMERGV06_QI.pdf)\n\n- [Caveats for IMERG extension into TRMM era](https://docserver.gesdisc.eosdis.nasa.gov/public/project/GPM/IMERGV06_TRMMera-caveats.pdf)\n\n- [IMERG Technical Documentation](https://docserver.gesdisc.eosdis.nasa.gov/public/project/GPM/IMERG_doc.06.pdf)\n\n- [Release notes; New Morphing algorithm](https://docserver.gesdisc.eosdis.nasa.gov/public/project/GPM/MorphingInV06IMERG.pdf)\n\n- [Remote-Sensing Reflectance](https://gpm1.gesdisc.eosdis.nasa.gov/data/GPM_L3/doc/README.GPM.pdf)\n\n- [Anomalies](https://gpmweb2https.pps.eosdis.nasa.gov/tsdis/AB/docs/gpm_anomalous.html)\n\n### Bands\n\n\n**Pixel Size**\n\n11132 meters\n\n**Bands**\n\n| Name | Units | Pixel Size | Description |\n|----------------------------------|--------------------------------------|------------|--------------------------------------------------------------------------------|\n| `gaugeRelativeWeighting` | % | meters | Weighting of gauge precipitation relative to the multi-satellite precipitation |\n| `precipitation` | mm/hr | meters | Merged satellite-gauge precipitation estimate |\n| `precipitationQualityIndex` | Equivalent gauges per 2.5 degree box | meters | Quality Index for precipitation field |\n| `probabilityLiquidPrecipitation` | % | meters | Accumulation-weighted probability of liquid precipitation phase |\n| `randomError` | mm/hr | meters | Random error for merged satellite-gauge precipitation |\n\n### Terms of Use\n\n**Terms of Use**\n\nAll NASA-produced data from the GPM mission is made freely available for the public to use.\n\n### Citations\n\nCitations:\n\n- Huffman, G.J., E.F. Stocker, D.T. Bolvin, E.J. Nelkin, Jackson Tan (2019),\n GPM IMERG Final Precipitation L3 1 month 0.1 degree x 0.1 degree V06,\n Greenbelt, MD, Goddard Earth Sciences Data and Information Services Center\n (GES DISC), Accessed: \\[Data Access Date\\], 10.5067/GPM/IMERG/3B-MONTH/06\n\n### DOIs\n\n- \u003chttps://doi.org/10.5067/GPM/IMERG/3B-MONTH/06\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('NASA/GPM_L3/IMERG_MONTHLY_V06')\n .filterDate('2019-01-01', '2020-01-01');\n\n// Select the max precipitation and mask out low precipitation values.\nvar precipitation = dataset.select('precipitation').max();\nvar mask = precipitation.gt(0.25);\nvar precipitation = precipitation.updateMask(mask);\n\nvar palette = [\n '000096','0064ff', '00b4ff', '33db80', '9beb4a',\n 'ffeb00', 'ffb300', 'ff6400', 'eb1e00', 'af0000'\n];\nvar precipitationVis = {min: 0.0, max: 1.5, palette: palette};\nMap.addLayer(precipitation, precipitationVis, 'Precipitation (mm/hr)');\nMap.setCenter(-76, 33, 3);\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_GPM_L3_IMERG_MONTHLY_V06) \n[GPM: Monthly Global Precipitation Measurement (GPM) v6](/earth-engine/datasets/catalog/NASA_GPM_L3_IMERG_MONTHLY_V06) \nIMERG-Final version \"06\" stopped being produced in September, 2021. Version \"07\" is expected to be released in September 2022 Global Precipitation Measurement (GPM) is an international satellite mission to provide next-generation observations of rain and snow worldwide every three hours. The Integrated Multi-satellitE Retrievals for GPM (IMERG) is the unified ... \nNASA/GPM_L3/IMERG_MONTHLY_V06, climate,geophysical,gpm,imerg,jaxa,monthly,nasa,precipitation,weather \n2000-06-01T00:00:00Z/2021-09-01T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.5067/GPM/IMERG/3B-MONTH/06](https://doi.org/https://doi.org/10.5067/GPM/IMERG/3B-MONTH/06)\n- [https://doi.org/10.5067/GPM/IMERG/3B-MONTH/06](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_GPM_L3_IMERG_MONTHLY_V06)"]]
