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

Metadata Updated: December 13, 2019

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.

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Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date May 1, 2019
Metadata Updated Date December 13, 2019

Metadata Source

Harvested from DOI CKAN Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Created Date May 1, 2019
Metadata Updated Date December 13, 2019
Publisher Fish and Wildlife Service
Unique Identifier FWS_ServCat_30999
Brent Frakes
Maintainer Email
Public Access Level public
Bureau Code 010:18
Metadata Context
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Harvest Source Id 34ce571b-cb98-4e0b-979f-30f9ecc452c5
Harvest Source Title DOI CKAN Harvest Source
Data First Published 2014-07-15
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Data Last Modified 2014-07-15
Program Code 010:094, 010:028
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Source Hash 1d385da712f3cb2655d85a47055453d0cc9ae220
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