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Thursday, May 23 • 2:00pm - 2:30pm
Using Google Earth Engine to Map Riparian Vegetation Change in Chelan County

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How do you measure riparian vegetation change over time? There are many possible solutions, ranging from visual inspection of air photos to object oriented classification of satellite imagery. When we were asked by Chelan County to map riparian vegetation change between 2011-2017 to help them with their Voluntary Stewardship Program monitoring report, we chose to use Google Earth Engine because of its speed, flexibility, and replicability. Our talk will cover three main topics: 1) How we determined the extent of riparian vegetation in Chelan County; 2) How we classified vegetation and analyzed change between the two time periods; 3) How we used a digital surface model to measure vegetation height and increase the accuracy of the change detection by reducing the number of false positives and false negatives. We will look at a few lines of Javascript, but primarily will focus on the overall process--how we did it, what worked well, what was challenging, and what we might do differently on subsequent analyses.

avatar for Matt Stevenson

Matt Stevenson

Principal, CORE GIS
Matt Stevenson is Principal at CORE GIS where he specializes in cartography, spatial analysis, web mapping, and GIS project management. He works primarily with government agencies and non-profits focused on public policy, natural resources, and conservation.

Thursday May 23, 2019 2:00pm - 2:30pm AKDT
GTCC RM 318 Tacoma Convention Center, 1500 Commerce St, Tacoma, WA 98402