This dataset is part of a Publisher Catalog, and not managed by Google Earth Engine. Contact sltao@pku.edu.cn for bugs or view more datasets from the PKURELAB Catalog. Learn more about Publisher datasets.
- Catalog Owner
- PKURELAB
- Dataset Availability
- 1992-04-01T00:00:00Z–2021-08-31T00:00:00Z
- Dataset Producer
- PKURELAB
- Contact
- sltao@pku.edu.cn
- Tags
Description
The LHScat dataset is the first long-term (since 1992), high-resolution (∼8.9 km) monthly satellite radar backscatter dataset over global land areas. It integrated signals from the European Remote Sensing satellite (ERS; 1992–2001; C-band; 5.3 GHz), Quick Scatterometer (QSCAT, 1999–2009; Ku-band; 13.4 GHz), and the Advanced SCATterometer (ASCAT; since 2007; C-band; 5.255 GHz). The 6-year data gap between C-band ERS and ASCAT was filled by modelling a substitute C-band signal during 1999–2009 from Ku-band QSCAT signals and climatic information. The quality of the merged radar signal was assessed by computing the Pearson correlation coefficient (Pearsonr) and root mean square error (RMSE) between the C-band and the corrected Ku-band signals in the overlapping years (1999–2001 and 2007–2009). To facilitate storage, the radar signals were scaled by a factor of 100 and converted to unsigned Int16. For more detailed information, please refer to the paper describing LHScat dataset(https://essd.copernicus.org/articles/15/1577/2023/).
Bands
Bands
Pixel size: 8900 meters (all bands)
| Name | Scale | Pixel Size | Description |
|---|---|---|---|
radar_singles |
0.01 | 8900 meters | Observed radar backscatter values |
Image Properties
Image Properties
| Name | Type | Description |
|---|---|---|
| Satellite | INT | The satellite source of the signal. The values are as follows:1. ERS; 2. ERS and QSCAT; 3. QSCAT; 4. ASCAT and QSCAT; 5. ASCAT |
Terms of Use
Terms of Use
Citations
Tao, S., Ao, Z., Wigneron, J.-P., Saatchi, S., Ciais, P., Chave, J., Le Toan, T., Frison, P.-L., Hu, X., Chen, C., Fan, L., Wang, M., Zhu, J., Zhao, X., Li, X., Liu, X., Su, Y., Hu, T., Guo, Q., Wang, Z., Tang, Z., Liu, Y. Y., and Fang, J.: A global long-term, high-resolution satellite radar backscatter data record (1992–2022+): merging C-band ERS/ASCAT and Ku-band QSCAT, Earth Syst. Sci. Data, 15, 1577–1596, https://doi.org/10.5194/essd-15-1577-2023, 2023. Tao, S., Chave, J., Frison, P.-L., Le Toan, T., Ciais, P., Fang, J., Wigneron, J.-P., Santoro, M., Yang, H., Li, X., Labrière, N., and Saatchi, S.: Increasing and widespread vulnerability of intact tropical rainforests to repeated droughts, Proc. Natl. Acad. Sci. USA, 119, e2116626119, https://doi.org/10.1073/pnas.2116626119, 2022.
Explore with Earth Engine
Code Editor (JavaScript)
// Load the LHScat ImageCollection and filter it to a specific time window. var LHScat = ee.ImageCollection("projects/ee-pkurelab/assets/LHScat") .filterDate("2020-03-01", "2020-04-01"); // Reduce the collection to a single representative image. var signals = LHScat.mean(); var region = ee.Geometry.Rectangle([73, 8, 150, 54]); // Visualization parameters for the radar singles signal. var visParams_signals = { min: -2000, max: 500, palette: ['green', 'yellow', 'red', 'firebrick'] }; // Center the map on the image footprint. Map.centerObject(region, 4); // Add the layer to the map for interactive preview. Map.addLayer(signals, visParams_signals, 'LHScat radar singles (2020-03)');