# JAXA ALOS/PALSAR Annual Forest/Non-Forest Mosaic
*data products*

## Specifications
- **level**: L3
- **distributor**: jaxa
- **gsd m**: {"native":25}
- **file format**: Cloud Optimized GeoTIFF (Ver.2+); binary (legacy)
- **access endpoint**: https://www.eorc.jaxa.jp/ALOS/en/dataset/fnf_e.htm
- **access model**: open
- **licence**: Free for research; registration required; attribution (c)JAXA
- **primary data portal url**: https://www.eorc.jaxa.jp/ALOS/en/dataset/fnf_e.htm
- **use cases**: ["Global forest extent mapping over multi-decadal time series","L-band SAR forest cover monitoring in persistently cloud-covered tropics","Long-term deforestation analysis (1992 to present, mosaic continuous)","REDD+ and carbon-MRV baseline forest cover for tropical countries","Cross-reference time series with optical Hansen Global Forest Change"]
- **practical limitations**: ["Mosaic temporal coverage and FNF classification temporal coverage differ; mosaic runs 1992 to 1998 (JERS-1), 2007 to 2010 (ALOS PALSAR), and 2015 to 2025 (ALOS-2 PALSAR-2), but FNF classification is available only for 2007 to 2010 (PALSAR) and 2017 to 2020 (PALSAR-2)","JERS-1 period (1992 to 1998) is mosaic-only; no FNF classification available; HH polarisation only (no HV)","2021 to 2025 FNF classification maps pending algorithm revision as of May 2026","Registration required for download; not anonymous open access","25 m GSD coarser than optical Landsat (30 m) and Sentinel-2 (10 m); appropriate for landscape-scale forest extent but not fine-scale clearings"]
- **known artefacts**: ["Annual mosaic compositing reduces speckle but can smear sub-annual disturbance events; per-scene SAR analysis required for event-level detection","FNF classification uses multi-year stacked input with target-year 3x weighting; cross-year discontinuities possible at sensor-generation boundaries (1998 to 2007 JERS-1 to ALOS gap, 2010 to 2015 ALOS to ALOS-2 gap)"]
- **last verified date**: "2026-05-18T00:00:00.000Z"
- **verified by**: agency-doc
- **claim status**: agency-verified
- **deployment context**: orbital

## Compositional position
- defor (topics) --[topic_capabilities]--> JAXA ALOS/PALSAR Annual Forest/Non-Forest Mosaic

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Source: https://eo-atlas.org/data_products/jaxa-fnf-mosaic
Maintainer: SpectraWorks B.V. (CC-BY 4.0)