UNEP/GRID-Geneva metadata catalogue
Global Forest/non forest map 2007-2015 - 25m, 100m, 1km (PALSAR-2/PALSAR - JAXA)
Global 25m resolutions PALSAR-2/PALSAR mosaic and forest/non-forest map are free and open dataset generated by applying JAXA's powerful processing and sophisticated analysis method/techniques to a lot of images obtained with Japanese L-band Synthetic Aperture Radars (PALSAR and PALSAR-2) on Advanced Land Observing Satellite (ALOS) and Advanced Land Observing Satellite-2 (ALOS-2).
The global 25m resolutions PALSAR/PALSAR-2 mosaic is a seamless global SAR image created by mosaicking the SAR images in backscattering coefficients measured by PALSAR/PALSAR-2, where all the strip data within 10x10 degrees in latitude and longitude are path-processed and mosaicked for the sake of processing efficiency. Correction of geometric distortion specific to SAR (ortho-rectification) and topographic effects on image intensity (slope correction) are applied to make forest classification easy. The size of one pixel is approximately 25 meter by 25 meter. The temporal interval of the mosaic is generally 1 year.
The global forest/non-forest map (FNF) is generated by classifying the backscattering intensity values in the global 25m resolution PALSAR-2/PALSAR mosaic so that strong and low backscatter in HV-polarization are classified "forest" (colored in green) and "non-forest" (colored in yellow), respectively. Here, "forest" is defined as the natural forest with the area larger than 0.5ha and forest cover over 90%, as same to the FAO definition. Since the radar backscatter from the forest depends on the region (climate zone), the classification of Forest/Non-forest is conducted by using the region dependent threshold of backscatter. The classification accuracy is more than 84% according to the comparison with reference data such as in-situ photos and high-resolution optical satellite images.
Simple
- Date ( Publication )
- 2016-01-25T00:00:00
- Presentation form
- Digital map
- Purpose
- For understanding and responding to global environmental changes such as global warming and loss of biodiversity, timely assessment of deforestation and forest degradation is essential. Global monitoring with satellite remote sensing is one of the most effective approaches to detect land surface changes because satellites can provide wall-to-wall images covering wide areas periodically. L-band Synthetic Aperture Radars (SAR) on ALOS and ALOS-2 can observe the land surface even under clouds, and therefore the L-band SAR data have been providing useful information about forest changes in tropical region.
- Status
- Completed
- Maintenance and update frequency
- Not planned
- Keywords ( Theme )
-
- GRID core datasets
- global
- deforestation
- forest
- tree
- vegetation
- Keywords ( Place )
-
- World
- Access constraints
- License
- Use constraints
- License
- Other constraints
-
It is prohibited to re-distribute the PALSAR-2/PALSAR mosaic and FNF data as is that users download. However, users can use the PALSAR-2/PALSAR mosaic and FNF data as is for research and publish thesis or research report, and modify the PALSAR-2/PALSAR mosaic and FNF data and publish or re-distribute such modified data. In such cases, data source shall be appropriately acknowledged as follows;
- In case of use of the PALSAR-2/PALSAR mosaic and FNF data as is: ©JAXA
- In case of users modify the PALSAR-2/PALSAR mosaic and FNF data and use such modified data: Original data provided by JAXA
It is prohibited to use the PALSAR-2/PALSAR mosaic and FNF data for commercial, profit-making purposes without JAXA's consent. If users wish to use the PALSAR-2/PALSAR mosaic and FNF data for such purposes, please make contact to JAXA.
- Other constraints
- JAXA retains ownership of the dataset. JAXA cannot guarantee any problem caused by or possibly caused by using the datasets.
- Spatial representation type
- Grid
- Denominator
- 2500
- Metadata language
- eng
- Character set
- UTF8
- Topic category
-
- Biota
- Begin date
- 2007
- End date
- 2015
))
- Reference system identifier
- WGS 1984
- OnLine resource
-
Forest/non forest map - 25m, 100m
(
WWW:LINK-1.0-http--link
)
Data Access (Need free registration)
- OnLine resource
-
Forest/non forest map - 1Km
(
WWW:LINK-1.0-http--link
)
Data Download (FTP access)
- Hierarchy level
- Dataset
Metadata
- File identifier
- de7eb6de-81bf-4ce9-ae4f-4148aac95f4a XML
- Metadata language
- eng
- Character set
- UTF8
- Date stamp
- 2017-03-07T13:51:43
- Metadata standard name
- ISO 19115:2003/19139
- Metadata standard version
- 1.0
Overviews
Geographic bounding box
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