CATATAN dari WRI: WRI memutuskan untuk berhenti memperbarui notifikasi FORMA. Tujuannya adalah
untuk menyederhanakan pengalaman pengguna Global Forest Watch dan mengurangi redundansi.
Kami mendapati bahwa Terra-i dan
GLAD lebih sering digunakan.
Selain itu, dengan menggunakan GLAD sebagai standar, Terra-i terbukti lebih unggul daripada FORMA secara global.
Peringatan FORMA dideteksi menggunakan kombinasi dua produk MODIS: NDVI (Normalized Difference Vegetation Index) dan FIRMS (Fires Information for Resource Management System). NDVI diperbarui setiap 16 hari, sedangkan data kebakaran diperbarui setiap hari. Model
dikembangkan secara terpisah untuk setiap kelompok ekologi guna menghubungkan dua input dengan
area pembukaan lahan, menggunakan data kehilangan tutupan pohon tahunan Hansen untuk melatih
model. Nilai minimum untuk memenuhi syarat sebagai pemberitahuan adalah 25% piksel yang dibersihkan, meskipun nilai minimum bervariasi menurut kelompok ekologi untuk meminimalkan positif palsu.
Berikut adalah contoh skrip
untuk pengantar singkat tentang set data FORMA.
Gambar dalam ImageCollection ini berisi data FORMA mentah yang dihitung setelah data NDVI MODIS baru tersedia, kira-kira setiap 16 hari.
Gambar berisi 4 band. Rentang 'delta', 'near_term_delta', dan 'clearing'
semuanya memberikan persentase pelunasan (dari 0 hingga 100) untuk periode akumulasi yang berbeda.
Akurasi memberikan ukuran keyakinan dalam prediksi ini
(0 = keyakinan sangat rendah, 100 adalah keyakinan tinggi).
Band
Ukuran Piksel 250 meter
Band
Nama
Unit
Min
Maks
Ukuran Piksel
Deskripsi
delta
%
0
100
meter
Persentase pembersihan dalam 96 hari terakhir
near_term_delta
%
0
100
meter
Persentase pembersihan dalam 32 hari terakhir
accuracy
%
0
100
meter
Keyakinan terhadap prediksi
clearing
%
0
100
meter
Persentase pembersihan dalam 365 hari terakhir
Properti Gambar
Properti Gambar
Nama
Jenis
Deskripsi
tahun
INT
Tahun data terbaru yang disertakan dalam set data
dua mingguan
INT
Periode dua mingguan (setiap 16 hari) dalam setahun
tanggal
STRING
Tanggal, dalam format "YYYY-MM-DD", data NDVI MODIS terakhir yang disertakan dalam set data ini
Persyaratan Penggunaan
Persyaratan Penggunaan
Set data FORMA tersedia tanpa batasan
penggunaan atau distribusi. WRI meminta agar pengguna memberikan atribusi yang tepat dan mengidentifikasi WRI dan GFW, jika berlaku, sebagai sumber data.
CATATAN dari WRI: WRI memutuskan untuk berhenti memperbarui notifikasi FORMA. Tujuannya adalah untuk menyederhanakan pengalaman pengguna Global Forest Watch dan mengurangi redundansi. Kami mendapati bahwa Terra-i dan GLAD lebih sering digunakan. Selain itu, dengan menggunakan GLAD sebagai standar, Terra-i mengungguli FORMA secara global. Peringatan FORMA terdeteksi …
[[["Mudah dipahami","easyToUnderstand","thumb-up"],["Memecahkan masalah saya","solvedMyProblem","thumb-up"],["Lainnya","otherUp","thumb-up"]],[["Informasi yang saya butuhkan tidak ada","missingTheInformationINeed","thumb-down"],["Terlalu rumit/langkahnya terlalu banyak","tooComplicatedTooManySteps","thumb-down"],["Sudah usang","outOfDate","thumb-down"],["Masalah terjemahan","translationIssue","thumb-down"],["Masalah kode / contoh","samplesCodeIssue","thumb-down"],["Lainnya","otherDown","thumb-down"]],[],[[["\u003cp\u003eThe FORMA dataset provides near real-time deforestation alerts using MODIS NDVI and FIRMS data, highlighting forest clearing percentages over different time periods (32, 96, and 365 days).\u003c/p\u003e\n"],["\u003cp\u003eWRI has discontinued FORMA updates in favor of Terra-i and GLAD, citing redundancy and performance comparisons.\u003c/p\u003e\n"],["\u003cp\u003eDespite being outdated, FORMA data (spanning from 2012 to 2019) remains available for research and analysis through Google Earth Engine.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset includes bands representing clearing percentages, confidence in predictions, and relevant time information (year, biweekly period, and date).\u003c/p\u003e\n"],["\u003cp\u003eFORMA alerts are triggered when clearing exceeds 25% of a pixel, although this threshold may vary depending on the specific ecological group to minimize false positives.\u003c/p\u003e\n"]]],[],null,["Dataset Availability\n: 2012-01-01T00:00:00Z--2019-04-23T00:00:00Z\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) [forest](/earth-engine/datasets/tags/forest) [forest-biomass](/earth-engine/datasets/tags/forest-biomass) [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\nDescription \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 images in this ImageCollection contain the raw FORMA data calculated after new\nMODIS NDVI data becomes available, approximately every 16 days.\n\nThe image contains 4 bands. The 'delta', 'near_term_delta', and 'clearing' bands\nall give a percentage of clearing (from 0 to 100) for different accumulation periods.\nAccuracy gives a measure of confidence in these predictions\n(0 = very little confidence, 100 is high confidence).\n\nBands\n\n\n**Pixel Size**\n\n250 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Pixel Size | Description |\n|-------------------|-------|-----|-----|------------|---------------------------------------------|\n| `delta` | % | 0 | 100 | meters | Percentage of clearing in the last 96 days |\n| `near_term_delta` | % | 0 | 100 | meters | Percentage of clearing in the last 32 days |\n| `accuracy` | % | 0 | 100 | meters | Confidence in predictions |\n| `clearing` | % | 0 | 100 | meters | Percentage of clearing in the last 365 days |\n\nImage Properties\n\n**Image Properties**\n\n| Name | Type | Description |\n|----------|--------|------------------------------------------------------------------------------------|\n| year | INT | Year of the most recent data included in the dataset |\n| biweekly | INT | The biweekly (every 16 days) period of the year |\n| date | STRING | Date, in \"YYYY-MM-DD\" format, of the last MODIS NDVI data included in this dataset |\n\nTerms 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\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\nvar dataset = ee.ImageCollection('WRI/GFW/FORMA/raw_output_ndvi')\n .filter(ee.Filter.date('2018-01-01', '2018-01-02'));\nvar percentOfClearing = dataset.select('clearing');\nvar visParams = {\n min: 0,\n max: 1,\n};\nMap.setCenter(26, -8, 3);\nMap.addLayer(\n percentOfClearing, visParams, 'Percent of clearing in the last 365 days');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/WRI/WRI_GFW_FORMA_raw_output_ndvi) \n[FORMA Raw Output NDVI](/earth-engine/datasets/catalog/WRI_GFW_FORMA_raw_output_ndvi) \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/raw_output_ndvi, daily,deforestation,forest,forest-biomass,forma,gfw,modis,monitoring,wri \n2012-01-01T00:00:00Z/2019-04-23T00:00:00Z \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_raw_output_ndvi)"]]
