Global Precipitation Measurement (GPM), üç saatte bir dünya genelinde yağmur ve karla ilgili yeni nesil gözlemler sunan uluslararası bir uydu görevidir. GPM için Entegre Çoklu Uydu Veri Alma (IMERG), GPM Takımyıldızı'ndaki tüm pasif mikrodalga cihazlarından gelen verileri birleştirerek yağmur tahminleri sağlayan birleşik algoritmadır.
Bu algoritma, tüm uydu mikrodalga yağış tahminlerini, mikrodalga ile kalibre edilmiş kızılötesi (IR) uydu tahminleriyle, yağış ölçer analizleriyle ve potansiyel olarak diğer yağış tahminleriyle birlikte tüm dünyada TRMM ve GPM dönemleri için ince zaman ve uzay ölçeklerinde kalibre etmeyi, birleştirmeyi ve enterpole etmeyi amaçlamaktadır.
Sistem, her gözlem süresi için birkaç kez çalıştırılır. İlk olarak hızlı bir tahmin verilir ve daha fazla veri geldikçe daha iyi tahminler sunulur. Son adımda, araştırma düzeyinde ürünler oluşturmak için aylık ölçüm verileri kullanılır. Algoritma hakkında daha fazla bilgi için IMERG Teknik Belgeleri'ni inceleyin.
Bu koleksiyonda, veriler kullanıma sunulduğunda düzenli olarak güncellenmiş sürümlerle değiştirilen geçici ürünler bulunur. Ürünler, "durum" adlı bir meta veri özelliğiyle işaretlenir. Bir ürün ilk kez kullanıma sunulduğunda özellik değeri "geçici" olur. Geçici bir ürün nihai sürümle güncellendikten sonra bu değer "kalıcı" olarak güncellenir.
Global Precipitation Measurement (GPM), üç saatte bir dünya genelinde yağmur ve karla ilgili yeni nesil gözlemler sunan uluslararası bir uydu görevidir. Integrated Multi-satellitE Retrievals for GPM (IMERG), GPM Constellation'daki tüm pasif mikrodalga cihazlarından gelen verileri birleştirerek yağış tahminleri sağlayan birleşik algoritmadır. Bu algoritma … için tasarlanmıştır.
[null,null,[],[[["\u003cp\u003eThe NASA/GPM_L3/IMERG_V07 dataset provides global precipitation estimates every 30 minutes, combining data from various satellite and ground-based sources.\u003c/p\u003e\n"],["\u003cp\u003eIMERG is a unified algorithm that merges and interpolates data from the GPM Constellation's passive-microwave instruments, IR satellite estimates, and gauge analyses.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset covers the period from June 1, 2000, to December 12, 2024, with a spatial resolution of approximately 11 km.\u003c/p\u003e\n"],["\u003cp\u003eData products are initially provisional and are regularly updated to permanent status as more refined information becomes available.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset is freely available for public use and is accessible through Google Earth Engine.\u003c/p\u003e\n"]]],[],null,["Dataset Availability\n: 2000-06-01T00:00:00Z--2025-08-31T02:30:00Z\n\nDataset Provider\n:\n\n\n [NASA GES DISC at NASA Goddard Space Flight Center](https://doi.org/10.5067/GPM/IMERG/3B-HH/07)\n\nCadence\n: 30 Minutes\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) [nasa](/earth-engine/datasets/tags/nasa) [precipitation](/earth-engine/datasets/tags/precipitation) [weather](/earth-engine/datasets/tags/weather) \nhalf-hourly \n\nDescription \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://arthurhou.pps.eosdis.nasa.gov/Documents/IMERG_V07_ATBD_final.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://arthurhou.pps.eosdis.nasa.gov/Documents/IMERG_TechnicalDocumentation_final.pdf)\n\n- [Release notes; New Morphing algorithm](https://gpm.nasa.gov/resources/documents/imerg-v07-release-notes)\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\nThis collection contains provisional\nproducts that are regularly replaced with updated versions when\nthe data become available. The products are marked with a metadata\nproperty called 'status'. When a product is initially made available,\nthe property value is 'provisional'. Once a provisional product\nhas been updated with the final version, this value is updated\nto 'permanent'.\n\nThis collection contains data from:\n\n- GPM_3IMERGHH_V07 [doi:10.5067/GPM/IMERG/3B-HH-L/07](https://doi.org/10.5067/GPM/IMERG/3B-HH-L/07)\n- GPM_3IMERGHH_07 [doi:10.5067/GPM/IMERG/3B-HH/07](https://doi.org/10.5067/GPM/IMERG/3B-HH/07)\n\nBands\n\n\n**Pixel Size**\n\n11132 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Pixel Size | Description |\n|----------------------------------|---------------------|--------|--------|------------|-------------------------------------------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|\n| `MWobservationTime` | min. into half hour | 0\\* | 29\\* | meters | PMW source time |\n| `MWprecipSource` | | | | meters | PMW source sensor identifier |\n| Bitmask for MWprecipSource - Bits 0-3: PMW source sensor identifier - 0: No observation - 1: TMI - 2: (unused) - 3: AMSR - 4: SSMI - 5: SSMIS - 6: AMSU - 7: MHS - 8: SAPHIR - 9: GMI - 10: (unused) - 11: ATMS - 12: AIRS - 13: TOVS - 14: CRIS ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||\n| `MWprecipitation` | mm/hr | 0\\* | 120\\* | meters | merged PMW precipitation |\n| `IRinfluence` | % | 0\\* | 100\\* | meters | Kalman filter weight for IR |\n| `IRprecipitation` | mm/hr | 0\\* | 79.5\\* | meters | IR precipitation |\n| `precipitation` | mm/hr | 0\\* | 174\\* | meters | snapshot precipitation - calibrated |\n| `precipitationUncal` | mm/hr | 0\\* | 120\\* | meters | snapshot precipitation - uncalibrated |\n| `probabilityLiquidPrecipitation` | % | 0\\* | 100\\* | meters | probability of liquid precipitation phase |\n| `randomError` | mm/hr | 0.24\\* | 250\\* | meters | calibrated-precipitation random error |\n\n\\* estimated min or max value\n\nTerms 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\nCitations \nCitations:\n\n- Huffman, G.J., E.F. Stocker, D.T. Bolvin, E.J. Nelkin, Jackson Tan (2019),\n GPM IMERG Final Precipitation L3 Half Hourly 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\\],\n [doi:10.5067/GPM/IMERG/3B-HH/07](https://doi.org/10.5067/GPM/IMERG/3B-HH/07)\n\nDOIs\n\n- \u003chttps://doi.org/10.5067/GPM/IMERG/3B-HH-L/07\u003e\n- \u003chttps://doi.org/10.5067/GPM/IMERG/3B-HH/07\u003e\n\nExplore with Earth Engine **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\nCode Editor (JavaScript) \n\n```javascript\n// GPM V7 30 minute data for a single day.\nvar range = ee.Date('2019-09-03').getRange('day');\nvar dataset = ee.ImageCollection('NASA/GPM_L3/IMERG_V07')\n .filter(ee.Filter.date(range));\n\n// Select the max precipitation and mask out low precipitation values.\nvar precipitation = dataset.select('precipitation').max();\nvar mask = precipitation.gt(0.5);\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, max: 15, 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_V07) \n[GPM: Global Precipitation Measurement (GPM) Release 07](/earth-engine/datasets/catalog/NASA_GPM_L3_IMERG_V07) \nGlobal 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 algorithm that provides rainfall estimates combining data from all passive-microwave instruments in the GPM Constellation. This algorithm is intended ... \nNASA/GPM_L3/IMERG_V07, climate,geophysical,gpm,imerg,jaxa,nasa,precipitation,weather \n2000-06-01T00:00:00Z/2025-08-31T02:30:00Z \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-HH/07](https://doi.org/https://doi.org/10.5067/GPM/IMERG/3B-HH/07)\n- [https://doi.org/10.5067/GPM/IMERG/3B-HH/07](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_GPM_L3_IMERG_V07)"]]
