US: Researchers from Arizona State University (ASU), US, developed new capabilities to conduct global drought monitoring using satellite detection of water stress and hydrologic models applied at regional scales. Under the direction of ASU hydrologist Enrique Vivoni, a contingent of ASU researchers is leading a group from NASA Ames, California State University at Monterey Bay and a non-profit research and development organisation known as Planetary Skin Institute (PSI) in integrating multi-resolution, remote sensing-based drought indices into an online, cloud computing-based visualisation platform.
“We have selected to use a water stress index to conduct drought monitoring specifically in drought-prone areas of northwest Mexico and northeast Brazil given their critical importance,” added Vivoni. “To do so, we will expand the capabilities of a cloud-based geospatial platform to incorporate drought products using remote sensing data and hydrologic model outputs. We hypothesize that the cloud-based platform will be a game-changing approach for drought monitoring, assessment and prediction at a range of scales.”
The drought products will be spatial maps provided approximately every two weeks that will show drought severity over the two countries of interest (Brazil and Mexico) at high resolution (4 to 8 kilometers) and over the globe at lower resolution (16 to 32 km). The drought maps will be derived from satellite remote sensing observations, specifically the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor on board the Earth Observing System Aqua and Terra satellites. These will be complemented with auxiliary data such as irrigation sectors, river basins, stream networks, reservoirs, political boundaries, temperature and precipitation, among others.
This data will be integrated into a cloud-based platform, called Drought ALERTS (short for Automated Land change Evaluation, Reporting and Tracking System). This global visualization system will overlay standard maps with scientific products related to natural resources management for near real-time global detection of water stress at multiple resolutions.
Targeted at national water managers, irrigation districts, policymakers and scientific communities, Drought ALERTS is designed to engage stakeholders and decision-makers in local to regional problems concerned with natural resources and risk management and will provide timely detection of drought events on a global basis with a high degree of accuracy.
“This innovative platform will utilize remote sensing products from low-Earth orbiting satellites to produce drought indices. It will help form the basis for resource allocation decisions and it will be refined over time as we find ways to make it better reflect the needs of decision-makers and others who use the information,” said Vivoni.