Küresel orman/orman dışı harita (FNF), küresel 25 m çözünürlüklü PALSAR-2/PALSAR SAR mozaikindeki SAR görüntüsünün (geri saçılma katsayısı) sınıflandırılmasıyla oluşturulur. Bu sayede, güçlü ve düşük geri saçılma pikselleri sırasıyla "orman" ve "orman dışı" olarak atanır. Burada "orman", alanı 0,5 hektardan büyük ve orman örtüsü %10'dan fazla olan doğal orman olarak tanımlanır. Bu tanım, Gıda ve Tarım Örgütü'nün (FAO) tanımıyla aynıdır. Ormandan gelen radar geri saçılımı bölgeye (iklim kuşağı) bağlı olduğundan, Orman/Orman Olmayan sınıflandırması bölgeye bağlı bir geri saçılım eşiği kullanılarak yapılır. Sınıflandırma doğruluğu, yerinde çekilen fotoğraflar ve yüksek çözünürlüklü optik uydu görüntüleri kullanılarak kontrol edilir.
Geri saçılma değerleri, yüksek enlemli ormanlık alanlarda yoldan yola önemli ölçüde değişebilir. Bunun nedeni, kışın ağaçların donmasıyla oluşan geri saçılma yoğunluğundaki değişikliktir.
Bunun orman/orman dışı sınıflandırmasını etkileyebileceğini lütfen unutmayın.
Bantlar
Piksel Boyutu 25 metre
Bantlar
Ad
Min.
Maks.
Piksel Boyutu
Açıklama
fnf
1
4
metre
Orman/Orman Olmayan arazi örtüsü sınıflandırması
fnf Class Table
Değer
Renk
Açıklama
1
#00b200
Yoğun Orman
2
#83ef62
Yoğun Olmayan Orman
3
#ffff99
Orman Olmayan
4
#0000ff
Su
Kullanım Şartları
Kullanım Şartları
JAXA, veri kümesinin sahipliğini elinde tutar ve veri kümelerinin kullanılmasından kaynaklanan veya muhtemelen kaynaklanabilecek sorunları garanti edemez.
Veri kümelerini kullanarak sonuç yayınlamak isteyen herkes, yayında verilerin sahipliğini açıkça belirtmelidir.
Alıntılar
Alıntılar:
Masanobu Shimada, Takuya Itoh, Takeshi Motooka, Manabu Watanabe,
Shiraishi Tomohiro, Rajesh Thapa ve Richard Lucas, "New Global
Forest/Non-forest Maps from ALOS PALSAR Data (2007-2010)", Remote Sensing
of Environment, 155, s. 13-31, Aralık 2014.
doi:10.1016/j.rse.2014.04.014.
Küresel orman/orman dışı harita (FNF), küresel 25 m çözünürlüklü PALSAR-2/PALSAR SAR mozaikindeki SAR görüntüsünün (geri saçılma katsayısı) sınıflandırılmasıyla oluşturulur. Bu sınıflandırmada, güçlü ve düşük geri saçılma pikselleri sırasıyla "orman" ve "orman dışı" olarak atanır. Burada "orman", alanı 0,5 hektardan büyük olan doğal orman olarak tanımlanır.
[null,null,[],[[["\u003cp\u003eThe JAXA/ALOS/PALSAR/YEARLY/FNF4 dataset provides a global forest/non-forest map at 25-meter resolution, classifying areas as Dense Forest, Non-dense Forest, Non-Forest, and Water.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset utilizes PALSAR-2/PALSAR SAR mosaic data from 2017 to 2021, applying a region-dependent threshold of backscatter to classify forest and non-forest areas.\u003c/p\u003e\n"],["\u003cp\u003eThe classification aligns with the Food and Agriculture Organization (FAO) definition of forest as natural forest with an area larger than 0.5 ha and forest cover over 10%.\u003c/p\u003e\n"],["\u003cp\u003eUsers should be aware that backscatter values can vary significantly over high latitude forest areas due to seasonal changes, potentially impacting classification accuracy.\u003c/p\u003e\n"],["\u003cp\u003eJAXA retains ownership of the dataset and encourages users to acknowledge the data source in any publications resulting from its use.\u003c/p\u003e\n"]]],[],null,["# Global 4-class PALSAR-2/PALSAR Forest/Non-Forest Map\n\nDataset Availability\n: 2017-01-01T00:00:00Z--2021-01-01T00:00:00Z\n\nDataset Provider\n:\n\n\n [JAXA EORC](https://www.eorc.jaxa.jp/ALOS/en/dataset/fnf_e.htm)\n\nTags\n:\n[alos](/earth-engine/datasets/tags/alos) [alos2](/earth-engine/datasets/tags/alos2) [classification](/earth-engine/datasets/tags/classification) [eroc](/earth-engine/datasets/tags/eroc) [forest](/earth-engine/datasets/tags/forest) [forest-biomass](/earth-engine/datasets/tags/forest-biomass) [jaxa](/earth-engine/datasets/tags/jaxa) [landcover](/earth-engine/datasets/tags/landcover) [palsar](/earth-engine/datasets/tags/palsar) [palsar2](/earth-engine/datasets/tags/palsar2) [sar](/earth-engine/datasets/tags/sar) \n\n#### Description\n\nThe global forest/non-forest map (FNF) is generated by\nclassifying the SAR image (backscattering coefficient) in the\nglobal 25m resolution PALSAR-2/PALSAR SAR mosaic so that strong and\nlow backscatter pixels are assigned as \"forest\" and \"non-forest\",\nrespectively. Here, \"forest\" is defined as the natural forest\nwith the area larger than 0.5 ha and forest cover over 10%. This\ndefinition is the same as the Food and Agriculture Organization\n(FAO) definition. Since the radar backscatter from the forest\ndepends on the region (climate zone), the classification of\nForest/Non-Forest is conducted by using a region-dependent\nthreshold of backscatter. The classification accuracy is\nchecked by using in-situ photos and high-resolution optical\nsatellite images.\n\nDetailed information:\n\n- [2017 - 2020](https://www.eorc.jaxa.jp/ALOS/en/dataset/pdf/DatasetDescription_PALSAR2_FNF_v200a.pdf)\n\nAttention:\n\n- Backscatter values may vary significantly from path to path over high latitude forest areas. This is due to the change of backscattering intensity caused by freezing trees in winter. Please note that this may affect the classification of forest/non-forest.\n\n### Bands\n\n\n**Pixel Size**\n\n25 meters\n\n**Bands**\n\n| Name | Min | Max | Pixel Size | Description |\n|-------|-----|-----|------------|--------------------------------------------|\n| `fnf` | 1 | 4 | meters | Forest/Non-Forest landcover classification |\n\n**fnf Class Table**\n\n| Value | Color | Description |\n|-------|---------|------------------|\n| 1 | #00b200 | Dense Forest |\n| 2 | #83ef62 | Non-dense Forest |\n| 3 | #ffff99 | Non-Forest |\n| 4 | #0000ff | Water |\n\n### Terms of Use\n\n**Terms of Use**\n\nJAXA retains ownership of the dataset and cannot guarantee\nany problem caused by or possibly caused by using the datasets.\nAnyone wishing to publish any results using the datasets should\nclearly acknowledge the ownership of the data in the publication.\n\n### Citations\n\nCitations:\n\n- Masanobu Shimada, Takuya Itoh, Takeshi Motooka, Manabu Watanabe,\n Shiraishi Tomohiro, Rajesh Thapa, and Richard Lucas, \"New Global\n Forest/Non-forest Maps from ALOS PALSAR Data (2007-2010)\", Remote Sensing\n of Environment, 155, pp. 13-31, December 2014.\n [doi:10.1016/j.rse.2014.04.014.](https://doi.org/10.1016/j.rse.2014.04.014)\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('JAXA/ALOS/PALSAR/YEARLY/FNF4')\n .filterDate('2018-01-01', '2018-12-31');\nvar forestNonForest = dataset.select('fnf');\nvar forestNonForestVis = {\n min: 1,\n max: 4,\n palette: ['00b200','83ef62','ffff99','0000ff'],\n};\nMap.setCenter(136.85, 37.37, 4);\nMap.addLayer(forestNonForest, forestNonForestVis, 'Forest/Non-Forest');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/JAXA/JAXA_ALOS_PALSAR_YEARLY_FNF4) \n[Global 4-class PALSAR-2/PALSAR Forest/Non-Forest Map](/earth-engine/datasets/catalog/JAXA_ALOS_PALSAR_YEARLY_FNF4) \nThe global forest/non-forest map (FNF) is generated by classifying the SAR image (backscattering coefficient) in the global 25m resolution PALSAR-2/PALSAR SAR mosaic so that strong and low backscatter pixels are assigned as \"forest\" and \"non-forest\", respectively. Here, \"forest\" is defined as the natural forest with the area larger than 0.5 ... \nJAXA/ALOS/PALSAR/YEARLY/FNF4, alos,alos2,classification,eroc,forest,forest-biomass,jaxa,landcover,palsar,palsar2,sar \n2017-01-01T00:00:00Z/2021-01-01T00:00:00Z \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/fnf_e.htm)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/JAXA_ALOS_PALSAR_YEARLY_FNF4)"]]
