Make A Graph

Dataset Title:	MBAY_LT - 7775-a_z1
Institution:	Coastal and Marine Hazards and Resources Program, U.S. Geological Survey (Dataset ID: MBAY_LT_7775_a_z1_nc)
Range:	longitude = -70.7809 to -70.7809°E, latitude = 42.3786 to 42.3786°N, time = 2005-02-09T17:09:56Z to 2005-05-18T12:49:32Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Subset \| Data Access Form \| Files

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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:

Web page authors can embed a graph of the latest data in a web page using HTML <img> tags.
Anyone can use ERDDAPs Slide Sorter to build a personal web page that displays graphs with the latest data (or other images or HTML content), each in its own, draggable slide.

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  station_id {
    String actual_range 
"MBAY_LT_7775_a_z1_nc
MBAY_LT_7775_a_z1_nc";
    String cf_role "timeseries_id";
    String ioos_category "Identifier";
    String long_name "Station ID";
  }
  feature_type_instance {
    String ioos_category "Identifier";
    String long_name "Identifier for each feature type instance";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range 42.3786, 42.3786;
    String axis "Y";
    String ioos_category "Location";
    String long_name "sensor latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 42.3786;
    Float32 valid_min 42.3786;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -70.7809, -70.7809;
    String axis "X";
    String ioos_category "Location";
    String long_name "sensor longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max -70.7809;
    Float32 valid_min -70.7809;
  }
  crs {
    Int32 actual_range -2147483647, -2147483647;
    String epsg_code "EPSG:4326";
    String grid_mapping_name "latitude_longitude";
    Float64 inverse_flattening 298.257223563;
    String ioos_category "Identifier";
    String long_name "http://www.opengis.net/def/crs/EPSG/0/4326";
    Float64 semi_major_axis 6378137.0;
  }
  platform {
    Int32 actual_range -2147483647, -2147483647;
    String definition "http://mmisw.org/ont/ioos/definition/stationID";
    String ioos_category "Identifier";
    String ioos_code "7775-a";
    String long_name "USGS-CMG time-series data from the Long-term observations in Massachusetts Bay; Site A-Boston Harbor project, mooring 777 and package 7775-a. Measurements of currents and other oceanographic properties were made to assess the impact of sewage discharge from the proposed outfall site.";
    String short_name "USGS-CMG time-series data: MBAY_LT - 777 - 7775-a";
  }
  time {
    UInt32 _ChunkSizes 1000;
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.107968996e+9, 1.116420572e+9;
    String axis "T";
    String calendar "gregorian";
    String ioos_category "Time";
    String long_name "time of measurement";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  z {
    Float64 actual_range -31.1197, -31.1197;
    String axis "Z";
    String FillValue "-9999.9";
    String grid_mapping "crs";
    String ioos_category "Other";
    String long_name "z of the sensor relative to the water surface";
    String positive "up";
    String standard_name "height";
    String units "m";
    Float64 valid_max -31.1197;
    Float64 valid_min -31.1197;
  }
  P_4023 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 39.03445, 43.27615;
    String ancillary_variables "platform";
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 4023;
    String FillValue "1.0000000409184788e+35";
    String FORTRAN_format "f10.3";
    String generic_name "pres";
    String grid_mapping "crs";
    Float32 initial_sensor_height 2.14;
    String interp_note "2 pad values interpolated.";
    String ioos_category "Other";
    String long_name "Sea Water Pressure (average over burst)";
    Float32 missing_value 1.0e+35;
    String platform "platform";
    Float32 sensor_depth 31.1197;
    Float32 sensor_hab 2.14;
    String sensor_type "ParosFreq";
    String serial "P68022";
    String standard_name "sea_water_pressure";
    String units "dbar";
  }
  SDP_850 {
    UInt32 _ChunkSizes 1000;
    Float32 actual_range 0.6329405, 224.4652;
    String ancillary_variables "platform";
    Float32 cal_C 1024.995, -0.00376508, -1.12975e-4, 0.0;
    Float32 cal_D 0.040873, 0.0, 0.0, 0.0;
    Float32 cal_F0 1.2e+7;
    String cal_serialnum "P68022";
    Float32 cal_T 27.7437, -5.6425e-5, 9.08633e-7, 1.68019e-9, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0;
    Float32 cal_U0 0.0;
    Float32 cal_Y 0.0, 0.0, 0.0, 0.0;
    String coordinates "time z latitude longitude";
    String coverage_content_type "physicalMeasurement";
    Int32 epic_code 1;
    String FillValue "1.0000000409184788e+35";
    String generic_name "pres";
    String grid_mapping "crs";
    Float32 initial_sensor_height 2.14;
    String interp_note "2 pad values interpolated.";
    String ioos_category "Other";
    String long_name "Sea Water Pressure";
    Float32 missing_value 1.0e+35;
    String platform "platform";
    Float32 sensor_depth 31.1197;
    Float32 sensor_hab 2.14;
    String sensor_type "ParosFreq";
    String serial "P68022";
    String standard_name "sea_water_pressure";
    String units "dbar";
  }
 }
  NC_GLOBAL {
    Float64 ADVCalcSampleVolumeOffset 0.15729999542236328;
    String ADVDeploymentSetupADRComments "USGS Boston Buoy B 7772, Slave to G357ADV B227, paros 68022, OBS#2 2183..";
    Float64 ADVDeploymentSetupBeginDeployment 8.0, 2.0, 2005.0, 23.0, 58.0, 30.0, 0.0;
    Float64 ADVDeploymentSetupBurstInterval 300.0;
    String ADVDeploymentSetupDeploymentName "7772";
    Float64 ADVDeploymentSetupRecordedDataFlags 1.0, 1.0, 1.0, 0.0, 1.0, 1.0, 1.0, 0.0;
    Float64 ADVDeploymentSetupSampleRate 2.0;
    Float64 ADVDeploymentSetupSamplesPerBurst 360.0;
    String ADVDeploymentSetupSyncMode "Start";
    String ADVProbeConfig "Ocean Probe";
    Float64 ADVProbeHeight 1.203;
    Float64 ADVProbeNbeams 3.0;
    Float64 ADVProbeSampInterval 3.0;
    Float64 ADVProbeSamplingVolumeOffset 18.0;
    String ADVProbeSerial "B227B";
    Float64 ADVProbeXmtRecDist 0.09000000357627869;
    Float64 ADVSampleVolumeOffset 18.0;
    String ADVType "10MHz_5cm";
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "station_id";
    String CompassInstalled "Yes";
    Float64 CompassOffset 0.0;
    Int32 COMPOSITE 0;
    String contributor_name "B. Butman";
    String contributor_role "principalInvestigator";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String COORD_SYSTEM "GEOGRAPHICAL";
    Float64 cpuSoftWareVerNum 8.200000000000001;
    String CREATION_DATE "06-Jan-2009 16:46:23";
    String creator_email "rsignell@usgs.gov";
    String creator_name "Rich Signell";
    String creator_phone "+1 (508) 548-8700";
    String creator_url "https://www.usgs.gov";
    String CTDInstalled "None";
    String DATA_CMNT "Small current and pressure file for early look at averages.";
    String DATA_ORIGIN "USGS/WHFC";
    String DATA_TYPE "TIME";
    String date_created "2017-04-11T22:19:00Z";
    String date_issued "2017-04-11T22:19:00Z";
    String date_metadata_modified "2017-04-11T22:19:00Z";
    String date_modified "2017-04-11T22:19:00Z";
    String DELTA_T "300";
    String Deployment_date "09-feb-05 17:00:00";
    Int32 DEPTH_CONST 1;
    String DESCRIPT "Sontek ADV calibrated data statistics file";
    Float64 dspSoftWareVerNum 4.0;
    Float64 Easternmost_Easting -70.7809;
    String EXPERIMENT "Boston Longterm";
    String experiment_name "MBAY_LT";
    String ExtPressInstalled "ParosFreq";
    String ExtSensorInstalled "Standard";
    String featureType "TimeSeries";
    Float64 FILL_FLAG 0.0;
    String geospatial_bounds "POINT(-70.78089904785156 42.37860107421875)";
    String geospatial_bounds_crs "EPSG:4326";
    Float64 geospatial_lat_max 42.3786;
    Float64 geospatial_lat_min 42.3786;
    Float64 geospatial_lat_resolution 0;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -70.7809;
    Float64 geospatial_lon_min -70.7809;
    Float64 geospatial_lon_resolution 0;
    String geospatial_lon_units "degrees_east";
    String geospatial_vertical_positive "up";
    String geospatial_vertical_resolution "0";
    String geospatial_vertical_units "meters";
    String grid_mapping_epsg_code "EPSG:4326";
    Float64 grid_mapping_inverse_flattening 298.257223563;
    String grid_mapping_long_name "http://www.opengis.net/def/crs/EPSG/0/4326";
    String grid_mapping_name "latitude_longitude";
    Float64 grid_mapping_semi_major_axis 6378137.0;
    String history 
"Fri Nov  1 20:20:37 2019: ncatted -a project,global,a,c,, CMG_Portal MBAY_LT/7775-a_z1.nc
WATER_DEPTH related attributes corrected by adj_tripod_depth: CD_310 and CS_300 calculated from u_1205 and v_1206 by Dolly.m :5 pad values replaced by linear interpolations using EPIC_interp.m :Global attributes corrected.:Extra variables deleted by dolly.m.: Variables P_4023, SDP_850, Tx_1211,  edited using maskedit.m with mask file adv7772vp-cal.msk.  :converted by adv2nc 2.50; edited by fixbadadvvel 1.000000; Converted to netCDF via MATLAB by adr2cdf.m V6.3
2017-04-11T22:19:00Z - pyaxiom - File created using pyaxiom
2024-12-12T10:25:50Z (local files)
2024-12-12T10:25:50Z https://cmgds.marine.usgs.gov/tabledap/MBAY_LT_7775_a_z1_nc.das";
    String id "7775-a_z1";
    String infoUrl "https://cmgds.marine.usgs.gov/ocean-time-series/";
    String INST_TYPE "Sontek ADV";
    String institution "Coastal and Marine Hazards and Resources Program, U.S. Geological Survey";
    String keywords "Earth Science > Oceans > Ocean Pressure > Water Pressure, Earth Science > Oceans > Ocean Temperature > Water Temperature, Earth Science > Oceans > Salinity/Density > Conductivity, Earth Science > Oceans > Salinity/Density > Salinity";
    String keywords_vocabulary "GCMD Science Keywords";
    Float64 latitude 42.3786;
    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.";
    Float32 longitude -70.7809;
    Float32 magnetic_variation -15.583333;
    Float64 MOORING 777;
    String naming_authority "gov.usgs.cmgp";
    String ncei_template_version "NCEI_NetCDF_TimeSeries_Orthogonal_Template_v2.0";
    String NCO "netCDF Operators version 4.8.1 (Homepage = http://nco.sf.net, Code = https://github.com/nco/nco)";
    String NCProperties "version=1|netcdflibversion=4.4.1.1|hdf5libversion=1.8.17";
    Float64 Northernmost_Northing 42.3786;
    String original_filename "7775-a.nc";
    String original_folder "MBAY_LT";
    Int32 POS_CONST 0;
    Float64 PressFreqOffset 21.0;
    String PressInstalled "No";
    Float64 PressOffset 0.0;
    Float64 PressScale 0.0;
    Float64 PressScale_2 0.0;
    String PROJECT "WHFC";
    String project "U.S. Geological Survey Oceanographic Time-Series Data, CMG_Portal";
    String project_summary "Measurements of currents and other oceanographic properties were made to assess the impact of sewage discharge from the proposed outfall site.";
    String project_title "Long-term observations in Massachusetts Bay; Site A-Boston Harbor";
    String publisher_email "emontgomery@usgs.gov";
    String publisher_name "Ellyn Montgomery";
    String publisher_phone "+1 (508) 548-8700";
    String publisher_url "https://www.usgs.gov";
    String RecorderInstalled "Yes";
    String Recovery_date "18-may-2005 13:02 ";
    String SensorOrientation "down";
    String source "USGS";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 42.3786;
    String standard_name_vocabulary "CF-1.6";
    String start_time "09-Feb-2005 17:09:56";
    String stop_time "18-May-2005 12:49:32";
    String subsetVariables "station_id";
    String summary "MBAY_LT - 7775-a_z1";
    String TempInstalled "Yes";
    String time_coverage_duration "PT8451576S";
    String time_coverage_end "2005-05-18T12:49:32Z";
    String time_coverage_resolution "PT300S";
    String time_coverage_start "2005-02-09T17:09:56Z";
    String title "MBAY_LT - 7775-a_z1";
    String VAR_DESC "u:v:w:P:SDP:Tx:CS:CD:u:v";
    String VAR_FILL "NaN";
    Float32 WATER_DEPTH 33.259674;
    String WATER_DEPTH_NOTE "water depth computed using mean pressure from 7775-a1h.nc - atmosphere (1013.3): (m) ";
    String WATER_MASS "?";
    Float64 Westernmost_Easting -70.7809;
  }
}

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.

(easy) You can get data by using the dataset's Data Access Form or Subset form. They make the URL for you.
(easy) You can make a graph or map by using the dataset's Make A Graph form. It makes the URL for you.
(not hard) You can bypass the forms and get the data or make a graph or map by generating the URL by hand or with a computer program or script.

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.