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 MODIS FIRMS baru tersedia, kira-kira setiap hari.
Setiap rentang memberikan persentase pembersihan (dari 0 hingga 100) untuk
periode akumulasi yang berbeda. "N" adalah jumlah hari antara update FIRMS terbaru dan update NDVI sebelumnya. N diberikan oleh properti 'date_delta'.
Band
Ukuran Piksel 250 meter
Band
Nama
Unit
Min
Maks
Ukuran Piksel
Deskripsi
nday
%
0
100
meter
Persentase penyelesaian dalam N hari terakhir
delta_nday
%
0
100
meter
Persentase pembersihan dalam 96+N hari terakhir
near_term_delta_nday
%
0
100
meter
Persentase pembersihan dalam 32+N hari terakhir
Properti Gambar
Properti Gambar
Nama
Jenis
Deskripsi
tahun
INT
Tahun data terbaru yang disertakan dalam set data
tanggal
STRING
Tanggal, dalam format "YYYY-MM-DD", data MODIS FIRMS terakhir yang disertakan dalam set data ini
date_delta
INT
Jumlah hari antara tanggal dan previous_biweekly_date
previous_biweekly
INT
Periode dua mingguan (setiap 16 hari) dalam setahun yang terkait dengan NDVI MODIS terbaru
previous_biweekly_date
STRING
Tanggal yang terkait dengan update NDVI MODIS terbaru
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 …
[null,null,[],[[["\u003cp\u003eThe FORMA dataset provides daily near real-time deforestation alerts, derived from MODIS NDVI and FIRMS data, by showing the percentage of forest clearing within different time periods.\u003c/p\u003e\n"],["\u003cp\u003eWRI has discontinued updating FORMA alerts, recommending Terra-i and GLAD as preferred alternatives due to higher usage and performance.\u003c/p\u003e\n"],["\u003cp\u003eFORMA alerts are triggered when the clearing threshold reaches 25% of a pixel, but this threshold varies across different ecological groups to minimize false positives.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset offers bands representing the percentage of clearing within the last N days, the last 96+N days, and the last 32+N days, where N represents the days between the latest FIRMS and previous NDVI updates.\u003c/p\u003e\n"],["\u003cp\u003eWhile no longer updated, the FORMA dataset remains available for use and distribution with proper attribution to WRI and GFW.\u003c/p\u003e\n"]]],[],null,["# FORMA Raw Output FIRMS\n\nDataset Availability\n: 2017-04-08T00:00:00Z--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 images in this ImageCollection contain the raw FORMA data calculated after new\nMODIS FIRMS data becomes available, approximately every day.\n\nEach band gives a percentage of clearing (from 0 to 100) for\ndifferent accumulation periods. \"N\" is the number of days between the latest FIRMS update\nand the previous NDVI update. N is given by the 'date_delta' property.\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| `nday` | % | 0 | 100 | meters | Percentage of clearing in the last N days |\n| `delta_nday` | % | 0 | 100 | meters | Percentage of clearing in the last 96+N days |\n| `near_term_delta_nday` | % | 0 | 100 | meters | Percentage of clearing in the last 32+N days |\n\n### Image 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| date | STRING | Date, in \"YYYY-MM-DD\" format, of the last MODIS FIRMS data included in this dataset |\n| date_delta | INT | The number of days between date and previous_biweekly_date |\n| previous_biweekly | INT | The biweekly (every 16 days) period of the year associated with the latest MODIS NDVI |\n| previous_biweekly_date | STRING | The date associated with the latest MODIS NDVI update |\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.ImageCollection('WRI/GFW/FORMA/raw_output_firms')\n .filter(ee.Filter.date('2018-08-01', '2018-08-15'));\nvar percentageOfClearing = dataset.select('nday');\nvar visParams = {\n min: 0.0,\n max: 0.01,\n};\nMap.setCenter(26, -8, 3);\nMap.addLayer(percentageOfClearing, visParams, 'Percentage of clearing');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/WRI/WRI_GFW_FORMA_raw_output_firms) \n[FORMA Raw Output FIRMS](/earth-engine/datasets/catalog/WRI_GFW_FORMA_raw_output_firms) \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_firms, daily,deforestation,fire,forest,forma,gfw,modis,monitoring,wri \n2017-04-08T00:00:00Z/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_raw_output_firms)"]]
