Rice researchers did a clever thing recently. They set up a Microsoft HoloLens as a mixed-reality sensor to feed VegSense. What is VegSense? It’s the application they created that measures understory vegetation, plant life that grows between the forest canopy and floor.
A proof-of-concept study by graduate student Daniel Gorczynski and bioscientist Lydia Beaudrot shows VegSense could be a suitable alternative to traditional classical field measurements at a low cost. This is indeed exciting news!
Their study in Methods in Ecology and Evolution shows the hardware-software combination excels at quantifying more mature trees in the wild, which is one measure of a forest’s overall health.
Gorczynski came up with the idea to try HoloLens, commonly marketed as a productivity tool for manufacturing, health care and education. It’s a great application of the existing technology. As a result, he developed open-source software for the device. He also noted that while the combination is less effective at picking up saplings and small branches, there’s ample room for improvement.
Gorczynski said he was introduced to mixed-reality sensing while an undergraduate at Vanderbilt University and recognized its potential for biological studies. “It seemed sort of like a natural fit,” he said. Gorczynski brought the idea to Beaudrot in 2019 shortly after his arrival at Rice.
The combination of stock hardware and custom software costs far less than systems based on lidar. Lidar is used for light detection and ranging. It is most often used in three-dimensional field studies according to Gorczynski, who developed VegSense on a platform geared more toward 3D games and interactive experiences than on hard science.
Field tests at Houston’s Memorial Park showed that at least for mature trees, the smaller solution is just as good. In the researchers’ case study, VegSense easily detected 48 of 50 such trees in the target area, a circle about 30 feet in diameter that Gorczynski walked, looking up, down and around to build the 3D database.
“For this study, we wanted to be really deliberate in trying to replicate more traditional understory vegetation structure measurements,” Gorczynski said. “We tried to get that level of detail.”
What he saw as he scanned the environment was a holograph-like grid pattern that tracked the surfaces of vegetation. “What’s really cool about that is you can see what the scanner is picking up, but also the spots you missed,” Gorczynski said. “The idea is to get the mesh to cover as much of the vegetation as possible because that’s what gets you the best scan.”
“The results were so nice that Dan quickly wrote it up for publication,” Beaudrot said, noting that Gorczynski expanded his validation of the gear during a subsequent field trip to Tanzania, the focus of one of 15 tropical forests in a recent rainforest study by the Rice group.
“This device can facilitate a lot of great ecological research, particularly because it’s so cost-effective,” she said. “Collecting vegetation information on the forest floor right now is really hard to do without a lot of manual labor, or a really expensive lidar system.”
“So, in essence, this is a groundbreaking, cost-effective device,” Beaudrot said. “It’s not going to give you the same resolution data that lidar will, but this is just the first application. We hope making VegSense open-source to the ecological research community will spur all the potential ways it can be developed.”
We hope you enjoyed reading this article as much as we enjoyed researching and writing it. We think it’s fantastic that new technologies are being developed to make tracking forests and other vegetation. As always, we appreciate your support and your readership. We are making headway on the backlog from the unprecedented ice storm that ripped through Central Texas in February. We are working hard to get to all requests. Thank you for your patience. We are thankful for your business.
