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AUTHORS: David Szczebak, Massachusetts Division of Fisheries and Wildlife
ABSTRACT: The Massachusetts Division of Fisheries and Wildlife has provided anglers and boaters with maps showing pond and lake bathymetry since the 1940s and 1950s. Technology has changed a lot since that time. To create new pond maps, biologists use GPS sounders to record depth measurements and GPS coordinates. This information is imported into GIS and run through several interpolation techniques to produce depth contours.While the original pond maps were created using anywhere between 50 and 150 data points, new maps often incorporate 8,000 to 12,000 points. The new statistical and data collection techniques, combined with a roughly 100-fold increase in the amount of data, result in pond maps that are far better representations of actual bathymetry.
