Aggregated by Ocean Data Network
Brought to you by ODN BDC
|
Fisheries Ocean Data ERDDAP
Aggregated by Ocean Data Network |
Brought to you by ODN BDC |
| Dataset Title: | Maine Coast Fishermen's Association: near-real-time sea temperature and pressure from sensors on fishing gear, with QC flags 
|
| Institution: | Ocean Data Network (Dataset ID: MCFA_FV_NRT) |
| Information: | Summary
| License
| FGDC
| ISO 19115
| Metadata
| Background
| Subset
| Make a graph
|
Attributes {
s {
tow_id {
UInt32 _ChunkSizes 9853;
Int32 actual_range 18695, 70086;
String cf_role "trajectory_id";
String comment "One trajectory is one tow: a single deployment of fishing gear carrying one logger.";
String ioos_category "Identifier";
String long_name "Unique Fishing Operation (Tow) Identifier";
}
time {
UInt32 _ChunkSizes 9853;
String _CoordinateAxisType "Time";
Float64 actual_range 1.71629782e+9, 1.793973529e+9;
String axis "T";
String comment "UTC.";
String ioos_category "Time";
String long_name "Time of Measurement (UTC)";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String units "seconds since 1970-01-01T00:00:00Z";
}
latitude {
UInt32 _ChunkSizes 9853;
String _CoordinateAxisType "Lat";
Float64 _FillValue NaN;
Float64 actual_range 40.5751, 44.298225;
String axis "Y";
String comment "Vessel GPS position from the deck unit, assigned to the gear. Fixed gear gets one position per phase: first fix for the down-profile, last fix for the up-profile, their mean for the fishing phase. WGS84.";
String ioos_category "Location";
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
Float64 valid_max 90.0;
Float64 valid_min -90.0;
}
longitude {
UInt32 _ChunkSizes 9853;
String _CoordinateAxisType "Lon";
Float64 _FillValue NaN;
Float64 actual_range -71.7414, -67.16976;
String axis "X";
String comment "Vessel GPS position from the deck unit, assigned to the gear. Fixed gear gets one position per phase: first fix for the down-profile, last fix for the up-profile, their mean for the fishing phase. WGS84.";
String ioos_category "Location";
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
Float64 valid_max 180.0;
Float64 valid_min -180.0;
}
pressure {
UInt32 _ChunkSizes 9853;
Float64 _FillValue NaN;
String accuracy "0.5 % of the pressure rating of the logger model (TD-200: 200 dbar, TD-1000: 1000 dbar)";
Float64 actual_range 1.01, 323.0;
String ancillary_variables "qc_aggregate qc_global_range qc_gear_type";
String comment "Vertical coordinate of the trajectory. Samples shallower than 1 dbar are not published.";
String ioos_category "Pressure";
String long_name "Sea Water Pressure";
Float64 resolution 0.1;
String standard_name "sea_water_pressure";
String units "dbar";
Float64 valid_min -5.0;
}
depth {
UInt32 _ChunkSizes 9853;
String _CoordinateAxisType "Height";
String _CoordinateZisPositive "down";
Float64 _FillValue NaN;
Float64 actual_range 1.0, 320.2;
String axis "Z";
String comment "Computed from sea pressure and the sample latitude with TEOS-10 (gsw.z_from_p: standard ocean of 0 degC and 35 g/kg, latitude-dependent gravity, no in-situ density correction; difference from true depth below 0.2 %). Positive down, rounded to 0.01 m. Missing where the sample has no position.";
String ioos_category "Location";
String long_name "Depth";
String positive "down";
String references "https://www.teos-10.org/pubs/gsw/html/gsw_z_from_p.html";
Float64 resolution 0.01;
String standard_name "depth";
String units "m";
}
temperature {
UInt32 _ChunkSizes 9853;
Float64 _FillValue NaN;
Float64 accuracy 0.05;
Float64 actual_range -10.0, 55.535;
String ancillary_variables "qc_aggregate qc_global_range qc_temp_spike qc_rollover qc_temp_stuck qc_RoC qc_drift qc_mud qc_response_time qc_clima qc_calibration_date";
Float64 colorBarMaximum 30.0;
Float64 colorBarMinimum -2.0;
String comment "In situ temperature. valid_min and valid_max are the limits of the gross range test.";
String ioos_category "Temperature";
String long_name "Sea Water Temperature";
Float64 resolution 0.001;
String standard_name "sea_water_temperature";
String units "degree_C";
Float64 valid_max 35.0;
Float64 valid_min -2.0;
}
segment_type {
UInt32 _ChunkSizes 9853;
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 3;
String comment "1 = gear being set (down-profile), 2 = gear being hauled (up-profile), 3 = gear fishing at depth.";
String flag_meanings "profiling_down profiling_up fishing";
Byte flag_values 1, 2, 3;
String ioos_category "Identifier";
String long_name "Phase of the Fishing Operation";
}
calibration_date {
UInt32 _ChunkSizes 9853;
Float64 actual_range 19509.0, 20627.0;
String calendar "proleptic_gregorian";
String comment "Most recent calibration of the logger identified by sensor_serial before the sample was taken. Missing where unknown.";
String ioos_category "Time";
String long_name "Last Calibration Date of the Sensor";
String time_origin "01-JAN-1970 00:00:00";
String units "seconds since 1970-01-01T00:00:00Z";
}
program {
UInt32 _ChunkSizes 9853, 35;
String ioos_category "Identifier";
String long_name "Program Name";
}
collaborators {
UInt32 _ChunkSizes 9853, 35;
String ioos_category "Identifier";
String long_name "Data Collection Partner";
}
vessel_id {
UInt32 _ChunkSizes 9853;
Int32 actual_range 11, 300;
String comment "Stable pseudonymous identifier of the fishing vessel. Vessel names are confidential; in OceanOPS the same vessels are registered under pseudonyms (FVON_ODN_n).";
String ioos_category "Identifier";
String long_name "Anonymised Vessel Identifier";
}
vessel_gear_type {
UInt32 _ChunkSizes 9853, 34;
String comment "FAO International Standard Statistical Classification of Fishing Gear (ISSCFG) category.";
String ioos_category "Identifier";
String long_name "Fishing Gear Carrying the Sensor";
String references "https://www.fao.org/3/a-bt987e.pdf";
}
sensor_manufacturer {
UInt32 _ChunkSizes 9853, 9;
String ioos_category "Identifier";
String long_name "Sensor Manufacturer";
}
model {
UInt32 _ChunkSizes 9853, 7;
String comment "ZebraTech Moana model; the number is the pressure rating in dbar (TD-200, TD-1000).";
String ioos_category "Identifier";
String long_name "Sensor Model";
}
sensor_serial {
UInt32 _ChunkSizes 9853, 4;
String comment "Manufacturer serial number of the logger. Separates simultaneous tows of one vessel and ties calibration_date to an instrument.";
String ioos_category "Identifier";
String long_name "Sensor Serial Number";
}
WMO_ID {
UInt32 _ChunkSizes 9853, 7;
String comment "OceanOPS/WMO platform identifier used for GTS distribution. One identifier is issued per sensor deployed on a vessel (not per vessel), so a vessel working several loggers carries several identifiers and simultaneous tows have different ones. Empty until OceanOPS has issued the identifier.";
String ioos_category "Identifier";
String long_name "WMO Platform Identifier (OceanOPS)";
String references "https://www.ocean-ops.org";
}
du_id {
UInt32 _ChunkSizes 9853;
Int32 actual_range 286, 949;
String comment "Internal identifier of the deck unit (data logger receiver) on board the vessel at the time of the tow.";
String ioos_category "Identifier";
String long_name "Deck Unit Identifier";
}
WIGOS_ID {
UInt32 _ChunkSizes 9853, 17;
String comment "WMO Integrated Global Observing System identifier of the platform (0-22000-0-<WMO_ID>). Empty until issued.";
String ioos_category "Identifier";
String long_name "WIGOS Station Identifier";
String references "https://www.ocean-ops.org";
}
qc_aggregate {
UInt32 _ChunkSizes 9853;
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 4;
String comment "Worst result (highest of 1, 3, 4) of the per-sample tests below for this sample. A sample with no position (qc_location = 9) is unusable and gets qc_aggregate = 4. qc_clima and qc_calibration_date are reported separately and do not feed it.";
String flag_meanings "not_evaluated good suspect bad missing_value";
Byte flag_values 0, 1, 3, 4, 9;
String ioos_category "Quality";
String long_name "Aggregate Quality Flag";
String references "https://github.com/FVON-GOOS/qc-flags";
String standard_name "aggregate_quality_flag";
Byte valid_max 9;
Byte valid_min 0;
}
qc_gear_type {
UInt32 _ChunkSizes 9853;
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 4;
String comment "One verdict per tow, computed on the RAW GPS fixes of the deck unit. Two gear classes exist: mobile (trawls, seines) and fixed; longlines, set longlines, gillnets, traps and pots are all processed as fixed gear. No sample of the tow has a position, or first and last fix both missing: bad (4). Fixed gear whose first and last real GPS fixes are further apart than 10 x the maximum pressure (in metres): suspect (3); fixed gear with fewer than two fixes: not evaluated (0). Mobile gear with only one of the first/last fix missing: suspect (3). Mobile gear starting and ending less than 200 m apart while averaging more than 10 km/h along the track, or with zero duration: suspect (3). Seines and handlines: straight-line speed between first and last fix above 10 km/h, or zero duration: suspect (3). Where an operator has corrected a tow position afterwards (for example gear set or hauled by another vessel), the published position is the corrected one and this flag still records that the raw fixes were suspect.";
String flag_meanings "not_evaluated good suspect bad missing_value";
Byte flag_values 0, 1, 3, 4, 9;
String ioos_category "Quality";
String long_name "Gear Type Control Test Flag";
String references "https://github.com/FVON-GOOS/qc-flags/discussions/12";
String standard_name "quality_flag";
Byte valid_max 9;
Byte valid_min 0;
}
qc_date {
UInt32 _ChunkSizes 9853;
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 1;
String comment "Bad (4) when the time is earlier than 2010-01-01 or later than the processing time.";
String flag_meanings "not_evaluated good suspect bad missing_value";
Byte flag_values 0, 1, 3, 4, 9;
String ioos_category "Quality";
String long_name "Impossible Date Test Flag";
String references "https://github.com/FVON-GOOS/qc-flags/discussions/1";
String standard_name "quality_flag";
Byte valid_max 9;
Byte valid_min 0;
}
qc_location {
UInt32 _ChunkSizes 9853;
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 9;
String comment "Bad (4) when latitude or longitude is outside -90..90 / -180..180; missing (9) when the sample has no position.";
String flag_meanings "not_evaluated good suspect bad missing_value";
Byte flag_values 0, 1, 3, 4, 9;
String ioos_category "Quality";
String long_name "Impossible Location Test Flag";
String references "https://github.com/FVON-GOOS/qc-flags/discussions/2";
String standard_name "location_test_quality_flag";
Byte valid_max 9;
Byte valid_min 0;
}
qc_speed {
UInt32 _ChunkSizes 9853;
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 4;
String comment "Bad (4) when the speed between consecutive positions exceeds 4.12 m/s. Mobile gear only; fixed gear is always good (1).";
String flag_meanings "not_evaluated good suspect bad missing_value";
Byte flag_values 0, 1, 3, 4, 9;
String ioos_category "Quality";
String long_name "Impossible Speed Test Flag";
String references "https://github.com/FVON-GOOS/qc-flags/discussions/3";
String standard_name "quality_flag";
Byte valid_max 9;
Byte valid_min 0;
}
qc_global_range {
UInt32 _ChunkSizes 9853;
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 4;
String comment "Temperature outside -2..35 degree_C or pressure below -5 dbar: bad (4). Pressure between -5 and 0 dbar, or above 110 % of the pressure rating of the logger model (TD-200: 220 dbar, TD-1000: 1100 dbar): suspect (3).";
String flag_meanings "not_evaluated good suspect bad missing_value";
Byte flag_values 0, 1, 3, 4, 9;
String ioos_category "Quality";
String long_name "Gross Range Test Flag";
String references "https://github.com/FVON-GOOS/qc-flags/discussions/4";
String standard_name "gross_range_test_quality_flag";
Byte valid_max 9;
Byte valid_min 0;
}
qc_temp_spike {
UInt32 _ChunkSizes 9853;
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 4;
String comment "Bad (4) when a sample departs from the mean of its two neighbours by more than 6 degree_C (shallower than 500 dbar) or 2 degree_C (deeper).";
String flag_meanings "not_evaluated good suspect bad missing_value";
Byte flag_values 0, 1, 3, 4, 9;
String ioos_category "Quality";
String long_name "Temperature Spike Test Flag";
String references "https://github.com/FVON-GOOS/qc-flags/discussions/5";
String standard_name "spike_test_quality_flag";
Byte valid_max 9;
Byte valid_min 0;
}
qc_rollover {
UInt32 _ChunkSizes 9853;
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 3;
String comment "Suspect (3) when temperature jumps by more than 0.5 degree_C between consecutive samples during the fishing (bottom) phase.";
String flag_meanings "not_evaluated good suspect bad missing_value";
Byte flag_values 0, 1, 3, 4, 9;
String ioos_category "Quality";
String long_name "Digit Rollover Test Flag";
String references "https://github.com/FVON-GOOS/qc-flags/discussions/16";
String standard_name "quality_flag";
Byte valid_max 9;
Byte valid_min 0;
}
qc_temp_stuck {
UInt32 _ChunkSizes 9853;
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 4;
String comment "Profiling phases only; samples of the fishing (bottom) phase are always good (1). Suspect (3) when a sample equals both its neighbours (3 identical values in a row); bad (4) when it also equals the next sample on each side (5 in a row). Exact equality at the 0.001 degree_C resolution of the logger.";
String flag_meanings "not_evaluated good suspect bad missing_value";
Byte flag_values 0, 1, 3, 4, 9;
String ioos_category "Quality";
String long_name "Temperature Flat Line Test Flag";
String references "https://github.com/FVON-GOOS/qc-flags/discussions/6";
String standard_name "flat_line_test_quality_flag";
Byte valid_max 9;
Byte valid_min 0;
}
qc_RoC {
UInt32 _ChunkSizes 9853;
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 3;
String comment "Suspect (3) when the change between consecutive samples exceeds 3 standard deviations of the changes within the same segment of the tow.";
String flag_meanings "not_evaluated good suspect bad missing_value";
Byte flag_values 0, 1, 3, 4, 9;
String ioos_category "Quality";
String long_name "Temperature Rate of Change Test Flag";
String references "https://github.com/FVON-GOOS/qc-flags/discussions/13";
String standard_name "rate_of_change_test_quality_flag";
Byte valid_max 9;
Byte valid_min 0;
}
qc_drift {
UInt32 _ChunkSizes 9853;
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 3;
String comment "One verdict per tow: suspect (3) when the fishing (bottom) phase lasts less than 24 h and its first and last temperatures differ by more than 3 degree_C.";
String flag_meanings "not_evaluated good suspect bad missing_value";
Byte flag_values 0, 1, 3, 4, 9;
String ioos_category "Quality";
String long_name "Bottom Temperature Drift Test Flag";
String references "https://github.com/FVON-GOOS/qc-flags/discussions/10";
String standard_name "quality_flag";
Byte valid_max 9;
Byte valid_min 0;
}
qc_mud {
UInt32 _ChunkSizes 9853;
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 4;
String comment "Fixed gear only; mobile gear and tows without segments are always good (1). Detects sediment packed around the thermistor, which slows its response from about 1 s to minutes: the up-profile stays biased toward the bottom temperature. Needs at least 2 degree_C surface-to-bottom contrast, casts long enough to resolve the lag, a mid-column up-minus-down difference toward the bottom temperature, and a lag signature on the ascent (full lag, wash-out, pinned, or pinned then released). A profile that is offset but keeps its shape is treated as a water-mass change. The down-profile is flagged only with seabed evidence. Every detection is bad (4), whether automatic or confirmed by an operator; this test never reports suspect (3).";
String flag_meanings "not_evaluated good suspect bad missing_value";
Byte flag_values 0, 1, 3, 4, 9;
String ioos_category "Quality";
String long_name "Mud Contamination Test Flag";
String references "https://github.com/FVON-GOOS/qc-flags/discussions/9";
String standard_name "quality_flag";
Byte valid_max 9;
Byte valid_min 0;
}
qc_response_time {
UInt32 _ChunkSizes 9853;
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 4;
String comment "Profiling phases only: the gear moves too fast for the thermistor to follow. Vertical speed between consecutive samples above 1 dbar/s: suspect (3); above 2 dbar/s: bad (4).";
String flag_meanings "not_evaluated good suspect bad missing_value";
Byte flag_values 0, 1, 3, 4, 9;
String ioos_category "Quality";
String long_name "Sensor Response Time Test Flag";
String references "https://github.com/FVON-GOOS/qc-flags/discussions/15";
String standard_name "quality_flag";
Byte valid_max 9;
Byte valid_min 0;
}
qc_clima {
UInt32 _ChunkSizes 9853;
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 3;
String comment "Suspect (3) when temperature is outside the climatological range of the region; currently the global envelope -1.92..35 degree_C. Not part of qc_aggregate.";
String flag_meanings "not_evaluated good suspect bad missing_value";
Byte flag_values 0, 1, 3, 4, 9;
String ioos_category "Quality";
String long_name "Climatology Test Flag";
String references "https://github.com/FVON-GOOS/qc-flags/discussions/8";
String standard_name "climatology_test_quality_flag";
Byte valid_max 9;
Byte valid_min 0;
}
qc_calibration_date {
UInt32 _ChunkSizes 9853;
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 0, 3;
String comment "Suspect (3) when the last calibration is more than 2 years before the sample; not evaluated (0) when no calibration date is known. Not part of qc_aggregate.";
String flag_meanings "not_evaluated good suspect bad missing_value";
Byte flag_values 0, 1, 3, 4, 9;
String ioos_category "Quality";
String long_name "Calibration Age Test Flag";
String references "https://github.com/FVON-GOOS/qc-flags/discussions/7";
String standard_name "quality_flag";
Byte valid_max 9;
Byte valid_min 0;
}
}
NC_GLOBAL {
String _NCProperties "version=2,netcdf=4.9.4-development,hdf5=1.14.2";
String acknowledgement "Data collected by the skippers and crews of the Maine Coast Fishermen's Association (MCFA) vessels, and processed and published by Ocean Data Network.";
String cdm_data_type "Trajectory";
String cdm_trajectory_variables "tow_id, vessel_id, vessel_gear_type";
String comment "date_modified is written into every data file by the publishing pipeline. time_coverage_duration and time_coverage_resolution are not given: the dataset grows continuously and the sampling interval depends on the logger mode (seconds while profiling, minutes while on the bottom).";
String Conventions "COARDS, CF-1.10, ACDD-1.3";
String creator_email "erddap@oceandata.net";
String creator_institution "Ocean Data Network";
String creator_name "Ocean Data Network";
String creator_type "institution";
String creator_url "https://www.oceandata.net";
String dataset_status "OnGoing";
String date_created "2024-09-07";
String date_modified "2026-11-04T14:59:34Z";
String defaultDataQuery "tow_id,time,latitude,longitude,pressure,depth,temperature,segment_type,vessel_id,vessel_gear_type,sensor_manufacturer,model,sensor_serial,calibration_date,WMO_ID,program,collaborators,du_id,WIGOS_ID&time>=max(time)-7days";
String defaultGraphQuery "longitude,latitude,temperature&time>=max(time)-7days&qc_aggregate=1&.draw=markers";
Float64 Easternmost_Easting -67.16976;
String featureType "Trajectory";
Float64 geospatial_lat_max 44.298225;
Float64 geospatial_lat_min 40.5751;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -67.16976;
Float64 geospatial_lon_min -71.7414;
String geospatial_lon_units "degrees_east";
Float64 geospatial_vertical_max 320.2;
Float64 geospatial_vertical_min 1.0;
String geospatial_vertical_positive "down";
String geospatial_vertical_units "m";
String history
"2026-11-07T00:27:58Z (local files)
2026-11-07T00:27:58Z http://54.215.95.220:6161/erddap/tabledap/MCFA_FV_NRT.html";
String infoUrl "https://oceandata.net/projects/";
String institution "Ocean Data Network";
String instrument "ZebraTech Moana TD-1000 and TD-200 temperature-depth loggers";
String keywords "Earth Science > Oceans > Ocean Pressure > Water Pressure, Earth Science > Oceans > Ocean Temperature > Water Temperature, fishing gear, fishing vessel, Maine Coast Fishermen's Association, near real time, pressure, profile, quality flag, sea_water_pressure, sea_water_temperature, temperature, trajectory, vessel of opportunity";
String keywords_vocabulary "GCMD Science Keywords";
String license "These data may be used and redistributed free of charge provided the source is acknowledged (see acknowledgement). They are provided as is, are not intended for legal use or safety of navigation, and may contain inaccuracies: check the qc_* variables before use. Neither the data provider nor the publisher makes any warranty as to their accuracy, completeness or fitness for a particular purpose.";
String naming_authority "net.oceandata";
Float64 Northernmost_Northing 44.298225;
String platform "fishing vessel";
String processing_level "Near-real-time. Automated FVON QC tests applied as flags; no sample removed, corrected or interpolated.";
String program "Ocean Data Network";
String project "Maine Coast Fishermen's Association fishing vessel observations";
String publisher_email "erddap@oceandata.net";
String publisher_institution "Ocean Data Network";
String publisher_name "Ocean Data Network";
String publisher_type "institution";
String publisher_url "https://www.oceandata.net";
String references "https://github.com/FVON-GOOS/qc-flags ; https://fvon.org ; flag scale: IOC Manuals and Guides 54 (IODE quality flag scheme)";
String source "In situ temperature-depth loggers attached to commercial fishing gear (vessels of opportunity)";
String sourceUrl "(local files)";
Float64 Southernmost_Northing 40.5751;
String standard_name_vocabulary "CF Standard Name Table v79";
String subsetVariables "vessel_id, vessel_gear_type, sensor_manufacturer, model, program, collaborators, segment_type, qc_aggregate, qc_gear_type, qc_date, qc_location, qc_speed, qc_global_range, qc_temp_spike, qc_rollover, qc_temp_stuck, qc_RoC, qc_drift, qc_mud, qc_response_time, qc_clima, qc_calibration_date";
String summary "Near-real-time subsurface sea water temperature and pressure measured by autonomous temperature-depth loggers (ZebraTech Moana TD) attached to the fishing gear of commercial vessels taking part in the Maine Coast Fishermen's Association (MCFA) programme, in the Gulf of Maine. Gears: trawls and gillnets. Each trajectory (tow_id) is one gear deployment: a down-profile while the gear is set, a bottom or fishing phase, and an up-profile when it is hauled (segment_type). Data are offloaded to a deck unit when the gear returns on board and published within hours. Every sample is kept: the automated FVON quality-control tests only flag data (qc_* variables, scale 0 not evaluated, 1 good, 3 suspect, 4 bad, 9 missing value); nothing is removed or adjusted. Vessels are anonymised.";
String testOutOfDate "now-2days";
String time_coverage_end "2026-11-06T13:58:49Z";
String time_coverage_start "2024-05-21T13:23:40Z";
String title "Maine Coast Fishermen's Association: near-real-time sea temperature and pressure from sensors on fishing gear, with QC flags";
Float64 Westernmost_Easting -71.7414;
}
}
Data Access Protocol (DAP) and its
selection constraints.
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
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/pmelTaoDySst.htmlTable?longitude,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.