Visualize the EGSIEM Satellite Gravity-based Wetness Index in GLOFAS

The Horizon 2020 funded project EGSIEM (European Gravity Service for Improved Emergency Management) aims at demonstrating that satellite derived gravity products, derived from the Gravity Recovery and Climate Experiment (GRACE) mission, open the door for innovative approaches to flood & drought monitoring and forecasting. EGSIEM has developed methods for using gravity measurements from the GRACE satellite mission to produce near-real time (NRT) estimates of water storage variations. Whereas water storage products from GRACE were earlier only available on a monthly time scale, and with up to two months latency (time from observation to available map), the wetness index is now produced on a daily time scale, with latency down to 5 days. The index is presented as an anomaly from the normal water storage seasonal cycle and inter-annual variation, expressed in units of standard deviations.

This wetness index can now be visualized in GLOFAS. In the viewer

- Select “Hydrological”

- Click the “add layer”-symbol

- Write “gravity” in the search box

- Choose “Satellite Gravity-based Wetness Index-NRT

The layer will now be on the bottom of your layer list. “to:” gives the last available date of the product. The slider above the layer can be used to control opacity of the layer, to be able to see reporting points at the same time.

By Jon SKOIEN     June 12, 2017, noon