Assessing the Accuracy of High Spatial Resolution Effort Data
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1 Assessing the Accuracy of High Spatial Resolution Effort Data Southwest Fisheries Science Center, Ecology Division Comparing VMS and Logbook Data in the California Groundfish Trawl Fishery Alice Thomas-Smyth, Aaron Mamula, & Cameron Speir
2 Objective Quantify error in the self-reported data of the California Groundfish trawl fishery using fine-scale spatial data for the years to assess whether logbooks are an appropriate source of information for spatial analysis and to what scale the information is accurate. Data Logbook data provides a historical record of fishing activity in the West Coast fisheries, however this data is self-reported Vessel monitoring system (VMS) data provides fine-resolution spatial and temporal data, however is only recently available and contains no vessel or activity information U.S. Department of Commerce National Oceanic and Atmospheric Administration NOAA Fisheries Page 2
3 Data - VMS Data Points Vessels Raw 22,081,317 1,139 Study area 20,522,715 1,134 Removed speeds and spikes 19,180,243 1,036 Removed ports 4,583, Fishing activity 1,017, U.S. Department of Commerce National Oceanic and Atmospheric Administration NOAA Fisheries Page 3
4 Data - Logbook Year Vessels Trips Tows ,976 7, ,883 7, ,078 7, ,884 6, ,469 5,609 U.S. Department of Commerce National Oceanic and Atmospheric Administration NOAA Fisheries Page 4
5 Methods identify fishing activity in VMS U.S. Department of Commerce National Oceanic and Atmospheric Administration NOAA Fisheries Page 5
6 Methods identify fishing activity in VMS U.S. Department of Commerce National Oceanic and Atmospheric Administration NOAA Fisheries Page 6
7 Methods tow path construction Straight line Bathymetry contours Least-cost path Change in bathymetry from set and up average depth U.S. Department of Commerce National Oceanic and Atmospheric Administration NOAA Fisheries Page 7
8 Methods matching the data No way to identify individual trips or tows in the VMS data Vessel days are units of comparison between the data Trips in this fishery tend to be short, 1-3 days Average distance per vessel day Original Logbook Data Original VMS Data Matched Data Vessel Days Number of Records a Unique Vessels Unique Trips Removed Records 13, ,507 7,508 35,334 4,583,006 18, , , ,498, a. Each logbook records is trawl tow consisting of set and up points. Each VMS record is a point consisting of a position, time, speed, and bearing. Each record in the matched data is a trawl tow, either from the logbook or constructed from consecutive points in the VMS data. U.S. Department of Commerce National Oceanic and Atmospheric Administration NOAA Fisheries Page 8
9 Results Straight line distance (km) Year Vessel Days Avg Median Std. Dev Min Max All years Bathymetry line distance (km) Year Vessel Days Avg Median Std. Dev Min Max All years Set and up logbook points and nearest VMS fishing point distance (km) Year Vessel Days Avg Median Std. Dev Min Max All years U.S. Department of Commerce National Oceanic and Atmospheric Administration NOAA Fisheries Page 9
10 Results - straight line vs bathymetry U.S. Department of Commerce National Oceanic and Atmospheric Administration NOAA Fisheries Page 10
11 Results set and up points U.S. Department of Commerce National Oceanic and Atmospheric Administration NOAA Fisheries Page 11
12 Results examining error (directionality) U.S. Department of Commerce National Oceanic and Atmospheric Administration NOAA Fisheries Page 12
13 Results examining error (hang time) Logbook tow hang time distance (km) Year Trawls Avg Median Std. Dev Min Max All years U.S. Department of Commerce National Oceanic and Atmospheric Administration NOAA Fisheries Page 13
14 Conclusions Lack of systematic directional error in the logbook data Speed-based criteria for fishing activity classification in VMS data feasible to allow for fine spatial resolution analysis of catch data Straight line tow paths are accurate representation of fishing activity in this fishery However a new method to draw tow paths bathymetrically is now available U.S. Department of Commerce National Oceanic and Atmospheric Administration NOAA Fisheries Page 14
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