2024년 1월 1일 밤부터 일본 부처 및 관련 기관의 요청에 따라 JAXA는 ALOS-2 PALSAR-2 긴급 관측을 시행했습니다. JAXA는 이러한 긴급 관측 데이터가 재해 관리에 매우 유용할 것으로 예상되므로 Google Earth Engine에서 이러한 데이터를 일반 및 연구용으로 공개하기로 결정했습니다.
JAXA는 2024년 1월 1~3일 및 1월 8일의 3m 단일 편파를 사용한 PALSAR-2 레벨 2.1 스트립 지도 모드 관측 데이터와 일부 보관 데이터를 출시했습니다. PALSAR-2 레벨 2.1 데이터는 디지털 고도 모델을 사용하여 레벨 1.1 데이터에서 정사보정됩니다. DN 값은 다음 방정식을 사용하여 데시벨 단위 (dB)의 시그마 제로 값으로 변환할 수 있습니다.
σ0 = 10*log10(DN2) - 83.0 dB
아래는 데이터 세트에 데이터가 있는 날짜입니다.
관측 날짜
프레임
Beam
A/D
2024년 1월 1일 및 2022년 9월 26일
0750, 0760, 0770
U2-6L
오름차순
2024년 1월 2일 및 2023년 6월 6일
2820, 2830, 2840
U2-8L
내림차순
2024년 1월 8일, 2024년 1월 3일, 2023년 12월 6일
0720, 0730
U2-9R
오름차순
대역
픽셀 크기 3미터
대역
이름
픽셀 크기
설명
b1
미터
HH 편광 지형 평탄화 감마 제로 후방 산란 계수입니다.
이용약관
이용약관
누구나 비상업적 용도로만 이 데이터를 무료로 사용할 수 있습니다.
자세한 이용약관은 JAXA G-Portal 서비스 약관(7항)을 참고하세요. G-Portal 데이터에 관한 조건입니다.
인용
인용:
이 논문에 사용된 데이터는 일본 항공우주탐사국 (JAXA)의 지구 관측 연구 센터 (EORC)에서 제공했습니다.
2024년 1월 1일 밤부터 일본 부처 및 관련 기관의 요청에 따라 JAXA는 ALOS-2 PALSAR-2 긴급 관측을 시행했습니다. JAXA는 이러한 긴급 관측 데이터가 재해 관리에 매우 유용할 것으로 예상되므로 Google Earth Engine에서 이러한 데이터를 공개하기로 결정했습니다.
[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)"]]
