Kiyomi and Chris going down.jpg

Mapping wild leek with a small drone

We also just got another paper published, in which we outline a methodology for mapping wild leek using a small drone, based on work in Gatineau Park. Wild leek is a small plant that grows on the forest floor, so for most of the year it is impossible to map - in summer it is obscured by the tree canopy, in fall it has already lost its leaves, and in winter it is covered by snow... but for a short period in spring it is bright green while most of the trees it is found under have still not developed their leaves. We flew a drone during that time, processed the imagery through SfM to generate a 3D point cloud, which is pretty standard use of drone imagery. But then we did something really neat

Tracking temperature in Tibet

We don't do shallow water in my lab. In collaboration with friend and colleague Yongming Xu and others, we used coarse-resolution (MODIS) satellite data as well as point observations from weather stations in Tibet to map and monitor temperature trends across Tibet for the period 2001-2015. Below you see one result of that work - a map showing the 15-year mean near-surface air temperature across Tibet. Compared to alternative data sets that provide the same type of information, we were able to show that our maps have dramatically lower errors, and are practically free of bias (consistent under- or over-estimation). Because we believe the data set we have produced will be useful to the communi