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Vancouver GIS Users Group

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Dec 7


Time: 5:30

Topic: Using Stream Networks for Watershed Summaries in British Columbia

Speaker: Matthew Bayly - M.J. Bayly Analytics Ltd.

Location: This will be a hybrid in person and Zoom meeting. Members may attend in person at CBRE's downtown offices at 1021 West Hastings Suite 2500, or virtually through Zoom.

Meeting Link: 

Abstract: Summarizing GIS data within a watershed requires thinking about upstream and downstream effect pathways. We will usually use watershed polygons with simple zonal statistics to characterize information across large basins. We can also use raster-based tools to summarize flow accumulation/direction etc. with a detailed DEM, but what if we want to produce upstream/downstream spatial summaries across large geographic regions while maintaining a high resolution with streamline vector data? In this presentation, Matthew Bayly will demonstrate the use of graph databases (networks made up of points, and edges) to produce upstream and downstream summaries continuously across a stream network. These processing techniques are valuable to summarize and visualize spatial variables at the level of the stream reach. Matthew will demonstrate several practical applications and then introduce an interactive web application being developed to predict dozens of useful attributes such as peak-flows, stream temperatures and cumulative effects from anthropogenic disturbances.

Bio: Matthew Bayly (M.J. Bayly Analytics Ltd.) is a Quantitative Biologist and Application Developer. His area of work and expertise resides in the realm of fisheries and aquatic science. Matthew works extensively with cumulative effect assessments in aquatic ecosystems, hydrology and fisheries population modeling and assessments. By following a science-first approach, Matthew works closely with clients and stakeholders to find right-sized solutions and leverage emerging tools and technologies.