First evaluation of GEDI’s measurement quality for the monitoring of water levels

The recent LiDAR altimetry mission of Nasa’s Global Ecosystem Dynamics Investigation (GEDI) instrument, offers the capability to provide billions of high-quality altimetry measurements worldwide.

A first study, carried out at TETIS, evaluated the accuracy of GEDI elevation measurements for the estimation of lake water levels. The difference between GEDI elevation estimates and water levels from hydrological gauges was evaluated for eight lakes in France and Switzerland.

GEDI elevation estimates show good agreement with gauge water level readings, with a mean elevation difference of 0.61 cm and a standard deviation of 22.3 cm. Over the eight studied lakes, the mean difference between GEDI elevations and in situ readings ranged from -13.8 cm to +9.8 cm with a standard deviation of the mean difference ranging from 14.5 to 31.6 cm. The precision of these estimates could be increased to 8.5 cm (standard deviation) by modeling the instrumental and environmental factors partly responsible for this variation.

Results for Neuchâtel Lake (Switzerland)

Read the whole publication:

Fayad I., Baghdadi N., Bailly J.S., Frappart F., Zribi M., 2020. Analysis of GEDI Elevation Data Accuracy for Inland Waterbodies Altimetry. Remote Sensing, Remote Sens. 2020, 12, 2714; doi:10.3390/rs12172714. https://www.mdpi.com/804846

More news

Publications

Half VHRS Soil Moisture series updated

Up to 10 series documenting soil moisture at plot-level every six days have been recently updated.

20.07.2021

Publications

Theia projects with the SCO label: an ever-growing list

Irrigation, forest, mangrove, infectious disease prevention, soil moisture, carbon storage, value of hedgerows, rice cultivation… Update of SCO projects related to Theia SECs and RANs.

11.06.2021

Publications

Monitoring 700,000 km² of the world’s glaciers

The Rate of Glaciers Elevation Change product is now available on Theia. It provides a map of the elevation changes of all glaciers on the globe between 2000 and 2019.

26.05.2021

Search