The dataset contains all ESA acquisitions over the ADEN zone (Europe, Africa and the Middle East) plus some products received from JAXA over areas of interest around the world. Further information on ADEN zones can be found in this technical note. ALOS PALSAR products are available in following modes: Fine Beam Single polarisation (FBS), single polarisation (HH or VV), swath 40-70 km, resolution 10 m, temporal coverage from 02/05/2006 to 30/03/2011 Fine Beam Double polarisation (FBD), double polarisation (HH/HV or VV/VH), swath 40-70 km, resolution 10 m, temporal coverage from 02/05/2006 to 30/03/2011 Polarimetry mode (PLR), with four polarisations simultaneously: swath 30 km, resolution 30 m, temporal coverage from 26/08/2006 to 14/04/2011 ScanSAR Burst mode 1 (WB1), single polarisation: swath 250-350 km, resolution 100 m, temporal coverage from 12/06/2006 to 21/04/2011. Following processing levels are available: RAW (Level 1.0): Raw data generated by every downlink segment and every band. Divided into an equivalent size to one scene SLC (Level 1.1): Slant range single look complex product. Not available for WB1 GDH (Level 1.5): Ground range Detected, Normal resolution product GEC (Level 1.5): Geocoded product. The table summarises the ALOS PALSAR offer. Instrument mode Product type Processing level description JAXA processing level equivalent Fine Beam Single polarisation (HH or VV) FBS_RAW_0P Raw data generated by every downlink segment and every band. Divided into an equivalent size to one scene 1.0 FBS_GDH_1P Ground range Detected, Normal resolution product 1.5 FBS_GEC_1P Geocoded product 1.5 FBS_SLC_1P Slant range single look complex product 1.1 Fine Beam Double polarisation (HH/HV or VV/VH) FBD_RAW_0P Raw data generated by every downlink segment and every band. Divided into an equivalent size to one scene 1.0 FBD_GDH_1P Ground range Detected, Normal resolution product 1.5 FBD_GEC_1P Geocoded product 1.5 FBD_SLC_1P Slant range single look complex product 1.1 Polarimetry mode (4 polarisation) PLR_RAW_0P Raw data generated by every downlink segment and every band. Divided into an equivalent size to one scene 1.0 PLR_GDH_1P Ground range Detected, Normal resolution product 1.5 PLR_GEC_1P Geocoded product 1.5 PLR_SLC_1P Slant range single look complex product 1.1 ScanSAR Burst mode 1 (single polarisation) WB1_RAW_0P Raw data generated by every downlink segment and every band. Divided into an equivalent size to one scene 1.0 WB1_GDH_1P Ground range Detected, Normal resolution product 1.5 WB1_GEC_1P Geocoded product 1.5

The ALOS/PALSAR annual mosaic is a global 25 m resolution dataset that combines data from many images captured by JAXA’s PALSAR and PALSAR-2 sensors on ALOS-1 and ALOS-2 satellites respectively. This product contains radar measurement in L-band and in HH and HV polarizations. It has a spatial resolution of 25 m and is available annually for 2007 to 2010 (ALOS/PALSAR) and 2015 to 2020 (ALOS-2/PALSAR-2). The JERS annual mosaic is generated from images acquired by the SAR sensor on the Japanese Earth Resources Satellite-1 (JERS-1) satellite. This product contains radar measurement in L-band and HH polarization. It has a spatial resolution of 25 m and is available for 1996. This mosaic data is part of a global dataset provided by the Japan Aerospace Exploration Agency (JAXA) Earth Observation Research Center.

ALOS PALSAR Level 1.0

ALOS PALSAR Level 1.1

A newer version of this dataset with data for 2015-2021 can be found in JAXA/ALOS/PALSAR/YEARLY/SAR_EPOCH The global 25m PALSAR/PALSAR-2 mosaic is a seamless global SAR image created by mosaicking strips of SAR imagery from PALSAR/PALSAR-2. For each year and location, the strip data were selected through visual inspection of the browse mosaics available over the period, with those showing minimum response to surface moisture preferentially used. In cases where the availability was limited (e.g., because of the requirement for observations during specific emergencies), data were necessarily selected from the year before or after, including from 2006. Shimada et al. 2014 There is no data for 2011-2014 due to the gap between ALOS and ALOS-2 temporal coverage. The SAR imagery was ortho-rectificatied and slope corrected using the 90m SRTM Digital Elevation Model. A destriping process (Shimada & Isoguchi, 2002, 2010) was applied to equalize the intensity differences between neighboring strips, occurring largely due to seasonal and daily differences in surface moisture conditions. Polarization data are stored as 16-bit digital numbers (DN). The DN values can be converted to gamma naught values in decibel unit (dB) using the following equation: γ₀ = 10log₁₀(DN²) - 83.0 dB Attention: 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. More information is available in the provider's Dataset Description.

International Polar Year (IPY), focusing on the north and south polar regions, aimed to investigate the impact of how changes to the ice sheets affect ocean and climate change to the habitats in these regions. IPY was a collaborative project involving over sixty countries for two years from March 2007 to March 2009. To meet the project goal, world space agencies observed these regions intensively using their own Earth observation satellites. One of these satellites, ALOS - with the PALSAR (Phased Array type L-band Synthetic Aperture Radar) sensor - observed these regions independently from day-night conditions or weather conditions. Carrying on this initiative, ESA is providing the ALOS PALSAR IPY Antarctica dataset, which consists of full resolution ALOS PALSAR ScanSAR WB1 products (100m spatial resolution) over Antarctica from July 2008 (cycle 21) to December 2008 (Cycle 24) and from May 2009 (cycle 27) to March 2010 (cycle 31). Missing products between the two periods above is due to L0 data over Antarctica not being available in ADEN archives and not processed to L1. Spatial coverage: Check the spatial coverage of the collection on a _\(map\) https://alos-ds.eo.esa.int/smcat/ALOSIPY/ available on the Third Party Missions Dissemination Service.

The 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 …

ALOS PALSAR Level 1.5

ALOS PALSAR Level 1.5

description: Americas ALOS Data Node (AADN) With the Japan Aerospace Exploration Agency's (JAXA's) launch of the Advanced Land Observation Satellite (ALOS) in January 2006, a new era of L band synthetic aperture radar (SAR) began. The Alaska Satellite Facility (AF) operates the Americans ALOS Data Node under a joint project agreement with the National Oceanic and Atmospheric Administration (NOAA) downlinking, processing, distributing, and archiving ALOS data. As the AADN, ASF has partnered with many organizations to ensure the widest, most-effective distribution of these data. In November of 2009, Advanced Land Observing Satellite (ALOS) Phased Array L-band Synthetic Aperture Radar (PALSAR) data became available to select users at the U.S. Geological Survey Earth (USGS), Resources Observation and Science (EROS) Center. ALTOS PALSAR 1.5 is the product of Multi-look amplitude generated after rending SAR processing to level 1.0 product, acquired in single polarization high resolution mode. The data are equally spaced on ground range.; abstract: Americas ALOS Data Node (AADN) With the Japan Aerospace Exploration Agency's (JAXA's) launch of the Advanced Land Observation Satellite (ALOS) in January 2006, a new era of L band synthetic aperture radar (SAR) began. The Alaska Satellite Facility (AF) operates the Americans ALOS Data Node under a joint project agreement with the National Oceanic and Atmospheric Administration (NOAA) downlinking, processing, distributing, and archiving ALOS data. As the AADN, ASF has partnered with many organizations to ensure the widest, most-effective distribution of these data. In November of 2009, Advanced Land Observing Satellite (ALOS) Phased Array L-band Synthetic Aperture Radar (PALSAR) data became available to select users at the U.S. Geological Survey Earth (USGS), Resources Observation and Science (EROS) Center. ALTOS PALSAR 1.5 is the product of Multi-look amplitude generated after rending SAR processing to level 1.0 product, acquired in single polarization high resolution mode. The data are equally spaced on ground range.

Digital Earth Africa provides access to Normalized Radar Backscatter data, for which for which Radiometric Terrain Correction (RTC) has been applied so data acquired with different imaging geometries over the same region can be compared. The ALOS/ALOS2 PALSAR is a global 25 m resolution dataset that combines data from many images captured by JAXA’s PALSAR and PALSAR-2 sensors on ALOS-1 and ALOS-2 satellites respectively. This product contains radar measurement in L-band and in HH and HV polarizations. It has a spatial resolution of 25m and is available annually for 2007 to 2010 (ALOS/PALSAR) and 2015 to 2021 (ALOS-2/PALSAR-2). ALOS/ALOS2 PALSAR mosaic data is part of a global dataset provided by the Japan Aerospace Exploration Agency (JAXA) Earth Observation Research Center. The relevant coverage and metadata of ALOS/ALOS2 PALSAR dataset can be viewed on DE Africa Metadata Explorer.Key PropertiesGeographic Coverage: Continental Africa - approximately 37° North to 35° SouthTemporal Coverage: 2007-2010, 2015 - 2021*Spatial Resolution: 25 x 25 meterUpdate frequency: Annual from 2007 to 2010 & 2015 to 2021Product Type: Radar backscatterProduct Level: Radiometric Terrain Corrected (RTC)Number of Bands: 5 BandsSource Data Coordinate System: WGS 84 (World Geodetic System 1984) (EPSG:4326)Service Coordinate System: WGS 84 (World Geodetic System 1984) (EPSG:4326)*Time is enabled on this service using UTC – Coordinated Universal Time. To assure you are seeing the correct year for each annual slice of data, the time zone must be set specifically to UTC in the Map Viewer settings each time this layer is opened in a new map. More information on this setting can be found here: Set the map time zone.Available BandsBand IDDescriptionData typeNo dataHHHH backscatteruint160HVHV backscatteruint160dateObservation date (days since launch)uint160linciLocal incidence angleuint80maskProcessing mask informationuint80Backscatter data is provided as digital number (DN), which can be converted to backscatter in decibel unit using 10*log10(DN2) - 83.0 dB.A data mask is provided that can be used to exclude pixels with potentially problematic measurements.More information about the dataset can be found on the JAXA dataset description page.

This ALOS-2 PALSAR-2 Strip Map (SM1 with 3m single polarization ) L2.1 product contains geometrically corrected (orthorectified) in selected AOIs between 2019 and 2020 for NASA/ESA/JAXA EODashboard Hackathon. The PALSAR-2 aboard the ALOS-2 is a Synthetic Aperture Radar (SAR), which emits microwave and receives the reflection from the ground to acquire information. Since it does not need other sources of light such as the sun, SAR has the advantage of providing satellite images during day or night. For transmitting and receiving microwaves PALSAR-2 uses the L-band, which is less affected by clouds and rains. This all-weather observing capability is suitable for monitoring disasters rapidly. In addition, L-band microwave can reach to the ground partially penetrating through vegetation to obtain information about vegetation and ground surface. Data for Tokyo and Los Angeles are Strip Map mode 1 (SM1) which is fine mode with 3m spatial resolution with 50km width swath and single polarization (HH).

ALOS PALSAR Level 2.2

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The Advanced Land Observing Satellite-2 (ALOS-2), launched May 14, 2014, is a follow-on mission to ALOS. ALOS-2 features an imaging microwave radar, PALSAR-2 (Phased Array type L-band Synthetic Aperture Radar-2). With a wider range of observation modes PALSAR-2 improves on its predecessor PALSAR (which flew onboard ALOS). PALSAR-2 observes in the L-band, specifically 1257.5 MHz which is adjustable by ± 21 MHz. ScanSAR mode provides a spatial resolution of 60 m and 100 m for a swath of 490 km and 350 km respectively. Stripmap mode provides a resolution of 10 m, 6 m, and 3 m for a swath of 70 km, 70 km, and 50 km respectively. Spotlight mode provides a resolution of 1 m x 3 m for a swath of 25 km x 25 km. ALOS-2 also decreased the revisit time of its predecessor from 46 days to 14 days. ALOS-2 also has the ability to look either to the right or the left. This collection provides open access to ScanSAR mode data acquired by ALOS-2. Recently acquired data are not included but are added when released for open access by JAXA. Although the ScanSAR mode has been acquired globally, the collection currently contains only partial global coverage, but coverage is increasing as data become available. Products have been processed by JAXA as Level 1.1, such that range and single look azimuth compressed data is represented by complex I and Q channels to preserve the magnitude and phase information. The range coordinate is in slant range. The image is focused onto zero Doppler direction, and an image file is generated per each scan for ScanSAR mode. In addition the full aperture processing method was used to generate the products. With the full aperture method, range compression and one look azimuth compression are performed for the data whose gaps between neighboring bursts in a sub swath are filled with zeroes, this processing is performed for each scan and each polarization. Granules in this collection are distributed as a zip and are quite large, with the majority being 28GB (single polarization) or 56GB (dual polarization).

PALSAR_Radiometric_Terrain_Corrected_low_res

ALOS PALSAR KMZ

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National ALOS PALSAR Imagery Mosaics - Panama

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