Ab der Nacht zum 1. Januar 2024 hat JAXA auf Ersuchen japanischer Ministerien und zugehöriger Organisationen die Notfallbeobachtung mit ALOS-2 PALSAR-2 durchgeführt. Da JAXA davon ausgeht, dass diese Notfalldaten für das Katastrophenmanagement äußerst nützlich sein werden, hat JAXA beschlossen, sie in Google Earth Engine für die öffentliche und wissenschaftliche Nutzung freizugeben.
JAXA hat PALSAR-2-Beobachtungsdaten im Stripmap-Modus der Stufe 2.1 mit 3 m Einzelpolarisation für den 1. bis 3. Januar und den 8. Januar 2024 sowie einige Archivdaten veröffentlicht. PALSAR-2-Daten der Stufe 2.1 werden anhand eines digitalen Höhenmodells aus Daten der Stufe 1.1 orthorektifiziert. Die DN-Werte können mit der folgenden Gleichung in Sigma-Naught-Werte in Dezibel (dB) umgerechnet werden:
σ0 = 10*log10(DN2) – 83,0 dB
Unten sehen Sie die Datumsangaben, für die das Dataset Daten enthält.
Jeder kann diese Daten kostenlos nutzen, sofern die Nutzung nicht kommerziell ist.
Ausführliche Nutzungsbedingungen finden Sie in den G-Portal-Nutzungsbedingungen von JAXA (Abschnitt 7). Bedingung für G-Portal-Daten).
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Quellenangaben:
Die für diesen Artikel verwendeten Daten wurden vom Earth Observation Research Center (EORC) der Japan Aerospace Exploration Agency (JAXA) bereitgestellt.
Auf Ersuchen japanischer Ministerien und zugehöriger Organisationen hat JAXA ab der Nacht zum 1. Januar 2024 eine Notfallbeobachtung mit ALOS-2 PALSAR-2 durchgeführt. Da JAXA davon ausgeht, dass diese Notfalldaten für das Katastrophenmanagement äußerst nützlich sein werden, hat JAXA beschlossen, sie in Google Earth Engine öffentlich zugänglich zu machen.
[null,null,[],[[["\u003cp\u003eThis dataset provides ALOS-2 PALSAR-2 Level 2.1 strip map mode observation data for disaster management and research purposes, with a focus on emergency observations starting January 1st, 2024.\u003c/p\u003e\n"],["\u003cp\u003eThe data includes 3m single polarization imagery with DN values convertible to sigma naught values (dB) and covers specific dates and frames as outlined in the table.\u003c/p\u003e\n"],["\u003cp\u003eJAXA opened this data to the public on Google Earth Engine for non-commercial use, subject to their G-Portal Terms of Service.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset contains orthorectified data from level 1.1, utilizing a digital elevation model for improved accuracy.\u003c/p\u003e\n"],["\u003cp\u003eUsers can explore and visualize the dataset through the provided Earth Engine snippet and code examples.\u003c/p\u003e\n"]]],["JAXA released ALOS-2 PALSAR-2 Level 2.1 strip map data for public and research use on Google Earth Engine, following emergency observations from January 1-3 and January 8, 2024, and some archive data. The dataset, covering 2022-09-26 to 2024-01-08, includes 3-meter single polarization data orthorectified from Level 1.1, with the ability to convert values to sigma naught. Usage is free for non-commercial purposes.\n"],null,["# ALOS-2 PALSAR-2 StripMap Level 2.1\n\nDataset Availability\n: 2022-09-26T00:00:00Z--2024-01-08T00:00:00Z\n\nDataset Provider\n:\n\n\n [JAXA EORC](https://www.eorc.jaxa.jp/ALOS/en/dataset/palsar2_l22_e.htm)\n\nTags\n:\n[alos2](/earth-engine/datasets/tags/alos2) [eroc](/earth-engine/datasets/tags/eroc) [jaxa](/earth-engine/datasets/tags/jaxa) [palsar2](/earth-engine/datasets/tags/palsar2) [radar](/earth-engine/datasets/tags/radar) [sar](/earth-engine/datasets/tags/sar) [satellite-imagery](/earth-engine/datasets/tags/satellite-imagery) \n\n#### Description\n\nStarting from the night of January 1st, 2024, based on the request from\nJapanese ministries and related organization, JAXA implemented ALOS-2\nPALSAR-2 emergency observation. Since JAXA expects these emergency\nobservation data to be extremely useful for disaster\nmanagement, JAXA decided to open these data on Google Earth Engine for\npublic and research usage.\n\nJAXA released PALSAR-2 Level 2.1 strip map mode observation data with 3m\nsingle polarization for January 1-3 and January 8 2024, together with\nsome archive\ndata. PALSAR-2 Level 2.1 data is orthorectified from level 1.1 data by using\ndigital elevation model. The DN values can be converted to sigma naught\nvalues in decibel unit (dB) using the following equation:\n\n- σ~0~ = 10\\*log~10~(DN^2^) - 83.0 dB\n\nBelow are the dates for which the dataset has data.\n\n| Obs date | Frame | Beam | A/D |\n|---------------------------------------|------------------|-------|-------|\n| 2024/01/01 and 2022/09/26 | 0750, 0760, 0770 | U2-6L | Asc. |\n| 2024/01/02 and 2023/06/06 | 2820, 2830, 2840 | U2-8L | Desc. |\n| 2024/01/08, 2024/01/03 and 2023/12/06 | 0720, 0730 | U2-9R | Asc. |\n\n### Bands\n\n\n**Pixel Size**\n\n3 meters\n\n**Bands**\n\n| Name | Pixel Size | Description |\n|------|------------|-------------------------------------------------------------------------|\n| `b1` | meters | HH polarization Terrain-flattened Gamma-Nought backscatter coefficient. |\n\n### Terms of Use\n\n**Terms of Use**\n\nAnyone can use this data free of charge subject to non-commercial use only.\nFor detailed terms of use see JAXA\n[G-Portal Terms of service](https://gportal.jaxa.jp/gpr/index/eula?lang=en)\n(Section 7. Condition concerning of G-Portal data).\n\n### Citations\n\nCitations:\n\n- The data used for this paper have been provided by Earth Observation\n Research Center (EORC) of Japan Aerospace Exploration Agency (JAXA).\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 coll = ee.ImageCollection('JAXA/ALOS/PALSAR-2/Level2_1/StripMap_202401');\n\nvar vis = {min: 0, max: 8000};\n\n// Visualize different date ranges\nvar visualizeDateRange = function(startDate, endDate, layerName) {\n var dateRange = coll.filterDate(startDate, endDate);\n Map.addLayer(dateRange, vis, layerName);\n};\n\nvisualizeDateRange('2023-06-06', '2023-06-07', 'Before-2023-06-06');\nvisualizeDateRange('2023-06-12', '2023-06-13', 'Before-2023-06-12');\nvisualizeDateRange('2022-09-26', '2022-09-27', 'Before-2022-09-26');\nvisualizeDateRange('2023-12-06', '2023-12-07', 'Before-2023-12-06');\nvisualizeDateRange('2024-01-01', '2024-01-02', 'After-2024-01-01');\nvisualizeDateRange('2024-01-02', '2024-01-03', 'After-2024-01-02');\nvisualizeDateRange('2024-01-03', '2024-01-04', 'After-2024-01-03');\nvisualizeDateRange('2024-01-08', '2024-01-09', 'After-2024-01-08');\n\nMap.setCenter(137.2228, 37.1204, 8);\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/JAXA/JAXA_ALOS_PALSAR-2_Level2_1_StripMap_202401) \n[ALOS-2 PALSAR-2 StripMap Level 2.1](/earth-engine/datasets/catalog/JAXA_ALOS_PALSAR-2_Level2_1_StripMap_202401) \nStarting from the night of January 1st, 2024, based on the request from Japanese ministries and related organization, JAXA implemented ALOS-2 PALSAR-2 emergency observation. Since JAXA expects these emergency observation data to be extremely useful for disaster management, JAXA decided to open these data on Google Earth Engine for public ... \nJAXA/ALOS/PALSAR-2/Level2_1/StripMap_202401, alos2,eroc,jaxa,palsar2,radar,sar,satellite-imagery \n2022-09-26T00:00:00Z/2024-01-08T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://www.eorc.jaxa.jp/ALOS/en/dataset/palsar2_l22_e.htm)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/JAXA_ALOS_PALSAR-2_Level2_1_StripMap_202401)"]]
