The Utah Geological Survey is employing bathymetric lidar to peel back the brine of the Great Salt Lake, revealing a hidden landscape for the first time. Traditional lidar utilizes near-infrared light, which reflects off the water surface, making it effective for mapping land but useless for underwater topography.
This new initiative uses green-wavelength lasers that penetrate the water column to reach the lakebed. By mounting these sensors to aircraft, researchers can capture millions of data points across the vast, shallow expanse of the lake.
This technical leap allows for the creation of high-resolution digital elevation models that bridge the gap between dry land and deep water, mapping everything from microbialite mounds—living rock structures built by cyanobacteria—to submerged historical features and complex fault lines.
Why This Mapping Effort Matters
The significance of this mapping effort lies in the precarious state of the Great Salt Lake and the urgent need for precise water-volume modeling.
Because the lake is exceptionally shallow, small changes in water levels result in massive shifts in surface area. Accurate bathymetry is the only way to calculate exactly how much water remains and how it moves across the basin.
For mapping and surveying professionals, this project represents a major advancement in data fusion, combining aerial green-laser surveys with boat-based sonar in deeper sections to create a seamless topobathy dataset.
Understanding the underwater terrain is essential for:
- Managing brine shrimp habitats
- Predicting dust storm risks from exposed lakebeds
- Protecting industrial and ecological systems that rely on the lake’s unique chemistry
Environmental and Future Applications
Looking forward, the success of green-laser lidar at the Great Salt Lake sets a precedent for monitoring other hypersaline and shallow-water environments globally.
As the technology becomes more affordable and portable, we may see a surge in high-resolution underwater mapping for:
- Archaeology (such as locating shipwrecks or submerged ruins)
- Earth sciences (tracking rapid erosion in coastal zones)
- Environmental monitoring of fragile aquatic systems
The ability to generate precise 3D models of lakebeds transforms how we approach environmental conservation, moving from guesswork to data-driven management.
