WRI 참고: WRI는 FORMA 알림 업데이트를 중단하기로 결정했습니다. 목표는 Global Forest Watch 사용자 환경을 간소화하고 중복을 줄이는 것이었습니다.
Terra-i와 GLAD가 더 자주 사용되는 것으로 확인되었습니다.
또한 GLAD를 표준으로 사용하여 Terra-i가 전 세계적으로 FORMA보다 성능이 우수함을 확인했습니다.
FORMA 알림은 NDVI (정규 식생 지수)와 FIRMS(자원 관리 시스템용 화재 정보)라는 두 가지 MODIS 제품을 조합하여 감지됩니다. NDVI 업데이트는 16일마다 처리되고 화재 업데이트는 매일 처리됩니다. 모델은 각 생태 그룹에 대해 개별적으로 개발되어 두 입력을 벌채 지역과 연결하며, Hansen 연간 나무 덮개 손실 데이터를 사용하여 모델을 학습시킵니다. 경고로 간주되는 최소 기준점은 픽셀의 25% 가 지워진 경우입니다. 하지만 오탐을 최소화하기 위해 기준점은 ecogroup에 따라 다릅니다.
다음은 FORMA 데이터 세트를 간략하게 소개하는 예시 스크립트입니다.
제거 비율은 0(제거 감지 안 됨) 또는 [ecogroup_bound:100) 범위의 값을 사용합니다. 여기서 ecogroup_bound는 WRI/GFW/FORMA/thresholds로 지정됩니다.
데이터가 수집되는 기간은 N일마다 달라지며, 여기서 N은 alert_date와 마지막 MODIS NDVI 업데이트 사이의 일수입니다.
대역
픽셀 크기 250미터
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단위
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최대
픽셀 크기
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alert_delta
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100
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픽셀의 해당 alert_date 값 이전의 6개 MODIS 기간 (96+N일) 동안의 제거 비율입니다.
alert_date
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1970/01/01 이후의 타임스탬프(밀리초)
이용약관
이용약관
FORMA 데이터 세트는 사용 또는 배포에 제한이 없습니다. WRI는 사용자가 적절한 저작자 표시를 제공하고 해당되는 경우 WRI와 GFW를 데이터 소스로 식별하도록 요청합니다.
WRI 참고: WRI는 FORMA 알림 업데이트를 중단하기로 결정했습니다. 목표는 Global Forest Watch 사용자 환경을 간소화하고 중복을 줄이는 것이었습니다. Terra-i와 GLAD가 더 자주 사용되는 것으로 확인되었습니다. 또한 GLAD를 표준으로 사용하여 Terra-i가 전 세계적으로 FORMA보다 성능이 우수함을 확인했습니다. FORMA 알림이 감지됨 …
[null,null,[],[[["\u003cp\u003eFORMA alerts dataset, available from 2012-01-01 to 2019-05-18, provides data on forest clearing using MODIS NDVI and FIRMS products.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset uses a 25% minimum pixel clearing threshold to trigger alerts, although this varies by ecoregion.\u003c/p\u003e\n"],["\u003cp\u003eWRI has discontinued updating FORMA alerts, recommending Terra-i and GLAD as preferred alternatives.\u003c/p\u003e\n"],["\u003cp\u003eFORMA alerts data is freely available for use and distribution with proper attribution to WRI and GFW.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset includes information on alert date and the percentage of clearing within a specified period.\u003c/p\u003e\n"]]],["The WRI/GFW FORMA dataset, provided by the World Resources Institute/Global Forest Watch, offered daily deforestation alerts from 2012 to 2019. Using MODIS data (NDVI and FIRMS), the dataset detected forest clearing, with a minimum threshold of 25% pixel clearing. Alerts, indicating the percentage of clearing (`alert_delta`) and timestamp (`alert_date`), were provided. WRI stopped updating FORMA alerts because other tools were more often used. The dataset is freely available for use with proper attribution to WRI and GFW.\n"],null,["# FORMA Alerts\n\nDataset Availability\n: 2012-01-01T00:00:00Z--2019-05-18T00:00:00Z\n\nDataset Provider\n:\n\n\n [World Resources Institute / Global Forest Watch](https://www.globalforestwatch.org/)\n\nTags\n:\n[daily](/earth-engine/datasets/tags/daily) [deforestation](/earth-engine/datasets/tags/deforestation) [fire](/earth-engine/datasets/tags/fire) [forest](/earth-engine/datasets/tags/forest) [forma](/earth-engine/datasets/tags/forma) [gfw](/earth-engine/datasets/tags/gfw) [modis](/earth-engine/datasets/tags/modis) [monitoring](/earth-engine/datasets/tags/monitoring) [wri](/earth-engine/datasets/tags/wri) \n\n#### Description\n\n**NOTE from WRI** : WRI decided to stop updating FORMA alerts. The goal was\nto simplify the [Global Forest Watch](https://www.globalforestwatch.org)\nuser experience and reduce redundancy.\nWe found that [Terra-i](http://www.terra-i.org/terra-i.html) and\n[GLAD](https://glad-forest-alert.appspot.com/) were more frequently used.\nMoreover, using GLAD as a standard, found that Terra-i outperformed\nFORMA globally.\n\nFORMA alerts are detected using a combination of two MODIS\nproducts: NDVI (Normalized Difference Vegetation Index) and FIRMS\n(Fires Information for Resource Management System). NDVI updates are\nprocessed every 16 days, while fire updates are processed daily. Models\nare developed individually for each ecogroup to relate the two inputs to\nthe area of clearing, using the Hansen annual tree cover loss data to train\nthe model. The minimum threshold to qualify as an alert is 25% of the pixel\ncleared, though thresholds vary by ecogroup to minimize false positives.\nHere is an [example script](https://code.earthengine.google.com/f29b1e4360f3fc36847bd789ceeb20f6)\nfor a quick introduction to the FORMA datasets.\n\nThe percentage of clearing takes a value of 0, no clearing detected,\nor in the range \\[ecogroup_bound:100), where ecogroup_bound is given by\nWRI/GFW/FORMA/thresholds .\nThe time periods over which data is collected varies by N-days, where N is the number\nof days between the alert_date and the last MODIS NDVI update.\n\n### Bands\n\n\n**Pixel Size**\n\n250 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Pixel Size | Description |\n|---------------|-------|-----|-----|------------|----------------------------------------------------------------------------------------------------------------------------------|\n| `alert_delta` | % | 0 | 100 | meters | Percentage of clearing which during the 6 MODIS periods (96 + N days) preceding the corresponding alert_date value for the pixel |\n| `alert_date` | ms | | | meters | Timestamp in milliseconds since 1970/01/01 |\n\n### Terms of Use\n\n**Terms of Use**\n\nThe FORMA datasets are available without restriction\non use or distribution. WRI does request that the\nuser give proper attribution and identify WRI and GFW, where applicable,\nas the source of the data.\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.Image('WRI/GFW/FORMA/alerts');\nvar formaAlerts = dataset.select('alert_delta');\nvar formaAlertsVis = {\n min: 25,\n max: 75,\n palette: ['d65898', 'da68a2'],\n};\nMap.setCenter(6.746, 46.529, 6);\nMap.addLayer(formaAlerts, formaAlertsVis, 'FORMA Alerts');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/WRI/WRI_GFW_FORMA_alerts) \n[FORMA Alerts](/earth-engine/datasets/catalog/WRI_GFW_FORMA_alerts) \nNOTE from WRI: WRI decided to stop updating FORMA alerts. The goal was to simplify the Global Forest Watch user experience and reduce redundancy. We found that Terra-i and GLAD were more frequently used. Moreover, using GLAD as a standard, found that Terra-i outperformed FORMA globally. FORMA alerts are detected ... \nWRI/GFW/FORMA/alerts, daily,deforestation,fire,forest,forma,gfw,modis,monitoring,wri \n2012-01-01T00:00:00Z/2019-05-18T00:00:00Z \n-50 -120 40 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://www.globalforestwatch.org/)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/WRI_GFW_FORMA_alerts)"]]
