- Dataset Availability
- 2019-12-01T00:00:00Z–2020-12-01T00:00:00Z
- Dataset Producer
- Earth Big Data LLC Alaska Satellite Facility
- Tags
Description
This data set is the first-of-its-kind spatial representation of multi-seasonal, global C-band Synthetic Aperture Radar (SAR) interferometric repeat-pass coherence and backscatter signatures. Coverage comprises land masses and ice sheets from 82 degrees Northern to 79 degrees Southern latitudes. The data set is derived from multi-temporal repeat-pass interferometric processing of about 205,000 Sentinel-1 C-band SAR images acquired in Interferometric Wide-Swath Mode from 1-Dec-2019 to 30-Nov-2020.
This dataset includes parameters for the coherence decay model, an exponential function fitted to the seasonal median coherence values as a function of the repeat interval to quantify how quickly coherence is lost over time. The parameters are:
rho: Represents the long-term coherence, the value that the model predicts as the repeat interval increases to infinity. It is a measure of the temporal stability of the scattering elements in the target area.
tau: Represents the rate of coherence decay, a measure of how quickly the coherence drops from its initial high value towards rho. Lower values indicate faster decorrelation.
rmse: The root mean square error, a quality indicator of the model fit. It quantifies the difference between the modeled coherence curve and the original, non-aggregated coherence observations used to fit the model.
The scale factor has already been applied to each of the bands. If you would like to do calculations using the digital numbers from the original rasters, load Earth_Big_Data/GLOBAL_SEASONAL_S1/V2019/DECAY_MODEL_PARAMETERS_RAW instead.
Other datasets derived from Sentinel-1 observations over the same time period include:
Bands
Pixel Size
92.7 meters
Bands
| Name | Pixel Size | Description |
|---|---|---|
fall_hh_rho |
meters | Fall (Sep-Nov 2020) HH rho. |
fall_hh_rmse |
meters | Fall (Sep-Nov 2020) HH rmse. |
fall_hh_tau |
meters | Fall (Sep-Nov 2020) HH tau. |
fall_vv_rho |
meters | Fall (Sep-Nov 2020) VV rho. |
fall_vv_rmse |
meters | Fall (Sep-Nov 2020) VV rmse. |
fall_vv_tau |
meters | Fall (Sep-Nov 2020) VV tau. |
spring_hh_rho |
meters | Spring (Mar-May 2020) HH rho. |
spring_hh_rmse |
meters | Spring (Mar-May 2020) HH rmse. |
spring_hh_tau |
meters | Spring (Mar-May 2020) HH tau. |
spring_vv_rho |
meters | Spring (Mar-May 2020) VV rho. |
spring_vv_rmse |
meters | Spring (Mar-May 2020) VV rmse. |
spring_vv_tau |
meters | Spring (Mar-May 2020) VV tau. |
summer_hh_rho |
meters | Summer (Jun-Aug 2020) HH rho. |
summer_hh_rmse |
meters | Summer (Jun-Aug 2020) HH rmse. |
summer_hh_tau |
meters | Summer (Jun-Aug 2020) HH tau. |
summer_vv_rho |
meters | Summer (Jun-Aug 2020) VV rho. |
summer_vv_rmse |
meters | Summer (Jun-Aug 2020) VV rmse. |
summer_vv_tau |
meters | Summer (Jun-Aug 2020) VV tau. |
winter_hh_rho |
meters | Winter (Dec 2019-Feb 2020) HH rho. |
winter_hh_rmse |
meters | Winter (Dec 2019-Feb 2020) HH rmse. |
winter_hh_tau |
meters | Winter (Dec 2019-Feb 2020) HH tau. |
winter_vv_rho |
meters | Winter (Dec 2019-Feb 2020) VV rho. |
winter_vv_rmse |
meters | Winter (Dec 2019-Feb 2020) VV rmse. |
winter_vv_tau |
meters | Winter (Dec 2019-Feb 2020) VV tau. |
Image Properties
Image Properties
| Name | Type | Description |
|---|---|---|
| tile_id | STRING | Tile ID |
Terms of Use
Terms of Use
Citations
Kellndorfer, J., Cartus, O., Lavalle, M. et al. Global seasonal Sentinel-1 interferometric coherence and backscatter data set. Sci Data 9, 73 (2022). doi:10.1038/s41597-022-01189-6.
DOIs
Explore with Earth Engine
Code Editor (JavaScript)
var dataset = ee.ImageCollection( 'Earth_Big_Data/GLOBAL_SEASONAL_S1/V2019/DECAY_MODEL_PARAMETERS'); var visParams = { bands: ['fall_hh_rho'], min: 0, max: 0.25, }; Map.setCenter(-45.2, 64.177, 5); Map.addLayer(dataset, visParams, 'Fall HH rho');