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Dataset Title:  NWFSC Observer Trawl Data, off West Coast of US, 2002-2006 Subscribe RSS
Institution:  NOAA NWFSC   (Dataset ID: nwioosObsTrawl2002)
Range: longitude = -125.75165 to -120.9479°E, latitude = 34.87604 to 48.488934°N
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Subset | Data Access Form
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Y Axis: 
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Things You Can Do With Your Graphs

Well, you can do anything you want with your graphs, of course. But some things you might not have considered are:

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -125.75164794921875, -120.9478988647461;
    String axis "X";
    Float64 colorBarMaximum -119.75;
    Float64 colorBarMinimum -125.85;
    String ioos_category "Location";
    String long_name "Longitude (Center of 10x10 km Grid Cell)";
    String standard_name "longitude";
    String units "degrees_east";
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range 34.876041412353516, 48.48893356323242;
    String axis "Y";
    Float64 colorBarMaximum 48.54;
    Float64 colorBarMinimum 34.82;
    String ioos_category "Location";
    String long_name "Latitude (Center of 10x10 km Grid Cell)";
    String standard_name "latitude";
    String units "degrees_north";
  grid_id {
    Float64 actual_range 5302.0, 21725.0;
    Float64 colorBarMaximum 23000.0;
    Float64 colorBarMinimum 5000.0;
    String Description "Unique grid cell identifier.";
    String ioos_category "Location";
    String long_name "Grid ID";
  survey_years {
    String Description "Time period of combined data: 2002-2006.";
    String ioos_category "Time";
    String long_name "Survey Years";
  fishery {
    String Description "Groundfish fishery sector by permit and gear-type.";
    String ioos_category "Identifier";
    String long_name "Fishery";
  common_name {
    String Description "The common name used to identify a species.";
    String ioos_category "Taxonomy";
    String long_name "Common Name";
  scientific_name {
    String Description "The scientific name used to identify a species.";
    String ioos_category "Taxonomy";
    String long_name "Scientific Name";
  discard_rate {
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum 0.0;
    String Description "Discard rate calculated as the species discard weight divided by the total catch (discard + retained) weight of groundfish in the 10 km x 10 km grid cell.";
    String ioos_category "Other";
    String long_name "Discard Rate";
  sys_id {
    Float64 actual_range 1.0, 5289.0;
    Float64 colorBarMaximum 6000.0;
    Float64 colorBarMinimum 0.0;
    String Description "Unique system identifier.";
    String ioos_category "Identifier";
    String long_name "System ID";
    String cdm_data_type "Other";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    Float64 Easternmost_Easting -120.9478988647461;
    Float64 geospatial_lat_max 48.48893356323242;
    Float64 geospatial_lat_min 34.876041412353516;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -120.9478988647461;
    Float64 geospatial_lon_min -125.75164794921875;
    String geospatial_lon_units "degrees_east";
    String history 
    String infoUrl "";
    String institution "NOAA NWFSC";
    String keywords "2002-2006, coast, common, data, discard, Earth Science > Biological Classification > Animals/Vertebrates > Fish, Earth Science > Biosphere > Aquatic Ecosystems > Coastal Habitat, Earth Science > Biosphere > Aquatic Ecosystems > Marine Habitat, Earth Science > Oceans > Aquatic Sciences > Fisheries, fishery, grid, identifier, name, noaa, nwfsc, observer, off, rate, scientific, survey, system, taxonomy, time, trawl, west, west coast, years";
    String keywords_vocabulary "GCMD Science Keywords";
    String license 
"The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.";
    Float64 Northernmost_Northing 48.48893356323242;
    String sourceUrl "";
    Float64 Southernmost_Northing 34.876041412353516;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String subsetVariables "fishery, survey_years, grid_id, longitude, latitude, common_name, scientific_name, sys_id";
    String summary 
"Observer Trawl Data collected during 2002-2006 off West Coast of US.

This data product originates from data collected by fishery observers in the West Coast Groundfish Observer Program (WCGOP), Fishery Resource Analysis and Monitoring Division (FRAM) at the Northwest Fisheries Science Center, NOAA Fisheries.  The WCGOP's goal is to improve total catch estimates by collecting information on the discarded catch (fish returned overboard at-sea) of west coast groundfish species.  All data were collected according to standard protocols and data quality control established by the WCGOP.  The observed portion of overall catch or landings in a fishery varies by coverage level.  Since all fishing operations are not observed, neither the maps nor the data can be used to characterize the fishery completely.  This is especially true for rarely-occurring species and when observed sample sizes are small.  We urge caution when utilizing these data due to the complexity of groundfish management and fleet harvest dynamics.  Grid cells representing less than 3 vessels and less than 10 hauls or sets are not shown due to confidentiality and to ensure adequate sample size.  In the limited-entry groundfish bottom trawl fishery, species discard rates (species discard weight / groundfish total catch (discard + retained weight)) are categorized by approximate quartile ranges and geo-referenced to 10 x 10 kilometer grid cells.  The observed trawl towline (line drawn from the start to end location of a trawl tow) was used to allocate data to 10 x 10 kilometer grid cells for calculation.  Seventeen species were represented based on combined observer data from 2002-2006.  The species included in this data product are dover sole (Microstomus pacificus), sablefish (Anoplopoma fimbria), longspine thornyhead (Sebastolobus altivelis), shortspine thornyhead (Sebastolobus alascanus), lingcod (Ophiodon elongatus), arrowtooth flounder (Atheresthes stomias), English sole (Parophrys vetulus), petrale sole (Eopsetta jordani), and the rockfishes (genus Sebastes), darkblotched rockfish (S. crameri), Pacific ocean perch (S. alutus), chilipepper (S. goodei), cowcod (S. levis), bocaccio (S. paucispinis), canary rockfish (S. pinniger), widow rockfish (S. entomelas), yelloweye rockfish (S. ruberrimus), and yellowtail rockfish (S. flavidus).

Purpose: This data product was developed to provide basic groundfish discard distribution information for a wide variety of audiences.  The West Coast Groundfish Observer Program conducts sampling of groundfish discarded by commercial fisheries along the entire continental U.S. West Coast.  The seventeen species included in this data product are among those of most interest to the fisheries management and commercial fishing communities.

Data Credits: NOAA Fisheries, Northwest Fisheries Science Center, Fishery Resource Analysis & Monitoring Division, West Coast Groundfish Observer Program, Seattle, WA.";
    String title "NWFSC Observer Trawl Data, off West Coast of US, 2002-2006";
    Float64 Westernmost_Easting -125.75164794921875;


Using tabledap to Request Data and Graphs from Tabular Datasets

tabledap lets you request a data subset, a graph, or a map from a tabular dataset (for example, buoy data), via a specially formed URL. tabledap uses the OPeNDAP (external link) Data Access Protocol (DAP) (external link) and its selection constraints (external link).

The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.

Tabledap request URLs must be in the form{?query}
For example,,latitude,time,station,wmo_platform_code,T_25&time>=2015-05-23T12:00:00Z&time<=2015-05-31T12:00:00Z
Thus, the query is often a comma-separated list of desired variable names, followed by a collection of constraints (e.g., variable<value), each preceded by '&' (which is interpreted as "AND").

For details, see the tabledap Documentation.

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