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
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:
Attention:
\nMore information is available in the provider’s
Dataset Description.
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
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:
Attention:
More information is available in the provider’s
Dataset Description.
Name | Description |
---|---|
HH | HH polarization backscattering coefficient, 16-bit DN. |
HV | HV polarization backscattering coefficient, 16-bit DN. |
angle | Local incidence angle (degrees). |
date | Observation date (days since Jan 1, 1970). |
qa | Processing information. |
Providers | |
---|---|
JAXA EORC (producer, licensor) | |
Google Earth Engine (host) | |
STAC Version | 0.6.2 |
Keywords | ALOS, ALOS2, EROC, JAXA, PALSAR, SAR |
License | proprietary |
Temporal Extent | 12/31/2006, 4:00:00 PM - 12/31/2017, 4:00:00 PM |
Citation | Masanobu Shimada, Takuya Itoh, Takeshi Motooka, Manabu Watanabe, Shiraishi Tomohiro, Rajesh Thapa, and Richard Lucas, "New Global Forest/Non-forest Maps from ALOS PALSAR Data (2007-2010)", Remote Sensing of Environment, 155, pp. 13-31, December 2014. [doi:10.1016/j.rse.2014.04.014.](https://doi.org/10.1016/j.rse.2014.04.014) |
Type | image_collection |
GSD | metersm |
cube:dimensions | {"x":{"type":"spatial","axis":"x","extent":[-180,180]},"y":{"type":"spatial","axis":"y","extent":[-90,90]},"temporal":{"type":"temporal","extent":["2007-01-01T00:00:00Z","2018-01-01T00:00:00Z"]},"bands":{"type":"bands","values":["HH","HV","angle","date","qa"]}} |