Modoc National Wildlife Refuge pond bathymetry: Comparing bathymetric models generated from topographic data collected by recreational sonar fish finder and a Real-Time Kinematic Global Positioning System sensors in support of the USFWS Water Resources Inventory and Assessment Program

This study compared bathymetric models generated from topographic data collected with: 1) a recreational Lowrance HDS Gen 2 sonar fish finder, and 2) a survey grade Real-time Kinematic (RTK) GPS unit using traditional topographic surveying techniques, at the Middle 395 and Headquarters ponds at the Modoc National Wildlife Refuge (MNWR) in August and October of 2013. The purpose of the study was to assess the suitability of the fish finder, which is low cost, for generating bathymetric data from wetlands and ponds at the MNWR.Digital Elevation Models (DEMs) of each pond were developed from pond bottom topographic data generated through the RTK GPS and sonar surveys. A smoothed DEM was used for contour creation and for graphical display, but was not used for analysis. The magnitude of elevation differences was calculated between concurrent DEMs developed for each pond, and the distribution of these differences were analyzed.The sonar system was found to be preferable in ponds with areas larger than 4 hectares (10 acres) and deeper ponds with average depths greater than 0.6 m (2 ft) where the shallow water limitation is encountered less frequently and where an RTK survey would be resource intensive to implement.

Data and Resources

Additional Info

Field Value
Maintainer Brent Frakes
Last Updated July 30, 2019, 08:01 (CDT)
Created July 30, 2019, 08:01 (CDT)
Identifier FWS_ServCat_30999
Issued 2014-07-15
Modified 2014-07-15
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