[Dataset Title/Name]: Soil Moisture and Ocean Salinity (SMOS) L4 Global Agricultural Drought Index

[pinkychow1010]

Contact Details

[email protected]

Dataset description

Summary
The SMOS Drought Index is derived from the SMOS Level-4 Root Zone Soil Moisture (SMOS-RZSM) product, which provides soil moisture data at 0-100 cm depth with a spatial resolution of 40 km monthly. This product, available from 2010 to 2022, is critical for assessing agricultural drought by monitoring water availability in the root zone. It is based on satellite data and complements traditional drought indices. The SMOS Drought Index offers a global, continuous, and reliable tool for evaluating drought conditions, particularly in agricultural and water resource management.

The satellite-based drought indices are valuable, as they provide drought indices at a global spatial and temporal scale. The two main requirements to calculate agricultural drought indices at a global scale are: First, data about the availability of soil moisture at the root zone, and second, the period for the presence of data to account for the severity of the drought condition.

The drought index (DI) is computed using SMOS-derived root zone soil moisture (RZSM) monthly fields. The RZSM monthly mean and max over the period is used to compute a soil water deficit to remove seasonal variability. From the soil water deficit, a soil moisture drought index is computed .The range of values for SMDI lies between -4 to +4, with -4 representing extreme dry conditions and +4 representing extreme wet conditions.

• Data type: Grid
• Resolution: 25000 meters
• Coordinate system: WGS 84 (EPSG:4326)

Source
CATDS (CNES, IFREMER, CESBIO)

Download Link
The global data are available as individual monthly nc files for download.
MIR_CLF4DA for Ascending Pass
MIR_CLF4DD for Descending Pass

License
Creative Commons 4.0

Citation
Nitu Ojha (2023). CATDS-CEC-SM L4 DI Monthly global drought indices obtained from SMOS' satellite root zone soil moisture. CNES, IFREMER, CESBIO (CATDS). doi:10.12770/c85f4b88-bed0-4137-a6c8-6a8b4070bd94

Dataset Owner
N. Ojha, Y. Kerr

Documentation
https://www.catds.fr/content/download/166579/file/SMOS_Drought_Index-NT.pdf

Earth Engine Snippet if dataset already in GEE

// Define the GEE path for the drought index
var droughtIndex = ee.ImageCollection('/drought_index');

// Get the latest image
var img = droughtIndex.limit(1, 'system:time_start').first();

Map.addLayer(img, {min: -4, max: 4}, 'Drought Index');

Enter license information

CC-BY-4.0

Keywords

Drought, Agriculture, Water, Climate

Code of Conduct

• I agree to follow this project's Code of Conduct

[asdsaah]

@samapriya
Data Download Link: Yes, ???-> Uploaded to GEE — It is available for download at Data; @pinkychow1010 I have the same question with the GEE code as I did with the other submission, I think I might be missing something on my end to get it to work.
Citation: Yes - reference DOI.
License for Use: Yes - data is available under CC BY 4.0