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Dataset Title:  Vog Measurement and Prediction Project (VMAP) Regional Forecast Model: Main
Hawaiian Islands, 0.01°, 2015
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Institution:  University of Hawaii   (Dataset ID: hawaii_soest_d70c_7d79_1c8f)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Data Access Form
Graph Type:  ?
X Axis:  ?
Y Axis:  ?
Color:  ?
Dimensions ?    Start ?    Stop ?
time (UTC) ?     specify just 1 value →
    << -
< <
latitude (degrees_north) ?
< slider >
longitude (degrees_east) ?
< slider >
Graph Settings
Color Bar:   Continuity:   Scale: 
   Minimum:   Maximum:   N Sections: 
Draw land mask: 
Y Axis Minimum:   Maximum:   Ascending: 
(Please be patient. It may take a while to get the data.)
Then set the File Type: (File Type information)
or view the URL:
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    Click on the map to specify a new center point. ?
[The graph you specified. Please be patient.]


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 {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.4442624e+9, 1.444392e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range 13.0, 28.000000000001812;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -164.0, -149.00000000001364;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  so4 {
    String ioos_category "Optical Properties";
    String long_name "sulfate (SO4) concentration averaged between 0 m and 100 m";
    String standard_name "mass_concentration_of_sulfate_ambient_aerosol_particles_in_air";
    String units "ug/m3";
  so2 {
    String ioos_category "Dissolved O2";
    String long_name "sulfur dioxide (SO2) concentration averaged between 0 m and 100 m";
    String standard_name "mass_concentration_of_sulfur_dioxide_in_air";
    String units "ppm";
    String acknowledgement "The Vog Measurement and Prediction Project (VMAP) is a vog research and forecast project funded by the U.S. Geological Survey (USGS) through a cooperative agreement with the University of Hawaii School of Ocean and Earth Science and Technology (SOEST). The Pacific Islands Ocean Observing System (PacIOOS) is funded through the National Oceanic and Atmospheric Administration (NOAA) as a Regional Association within the U.S. Integrated Ocean Observing System (IOOS). PacIOOS is coordinated by SOEST.";
    String author "Sarah Williamson";
    String cdm_data_type "Grid";
    String comment "Model runs produced by Dr. Steven Businger (";
    String contributor_name "Dr. Jim Potemra";
    String contributor_role "Data Manager";
    String Conventions "CF-1.6, ACDD-1.3, COARDS";
    String creator_email "";
    String creator_institution "University of Hawaii";
    String creator_name "Dr. Steven Businger";
    String creator_type "person";
    String creator_url "";
    String date_created "2017-08-22";
    String date_issued "2017-08-22";
    String date_metadata_modified "2017-08-22";
    String date_modified "2017-08-22";
    Float64 Easternmost_Easting -149.00000000001364;
    String geospatial_bounds "POLYGON ((13.0 -164.0, 28.0 -164.0, 28.0 -149.0, 13.0 -149.0, 13.0 -164.0))";
    String geospatial_bounds_crs "EPSG:4326";
    Float64 geospatial_lat_max 28.000000000001812;
    Float64 geospatial_lat_min 13.0;
    Float64 geospatial_lat_resolution 0.010000000000001208;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -149.00000000001364;
    Float64 geospatial_lon_min -164.0;
    Float64 geospatial_lon_resolution 0.009999999999990905;
    String geospatial_lon_units "degrees_east";
    String history 
"UH/SOEST (S. Businger), PacIOOS distribution (08/2017)
    String id "vmap_hi";
    String infoUrl "";
    String institution "University of Hawaii";
    String instrument "Not Applicable > Not Applicable";
    String instrument_vocabulary "GCMD Instrument Keywords";
    String ISO_Topic_Categories "climatologyMeteorologyAtmosphere, health";
    String keywords "activity, advisories, aerosol, air, ambient, atmosphere, atmospheric, averaged, between, chemistry, compounds, concentration, data, dioxide, dispersion, dissolved, dissolved o2, dynamics, earth, Earth Science > Atmosphere > Air Quality > Sulfur Oxides, Earth Science > Atmosphere > Atmospheric Chemistry > Oxygen Compounds, Earth Science > Atmosphere > Atmospheric Chemistry > Sulfur Compounds, Earth Science > Atmosphere > Atmospheric Chemistry > Sulfur Compounds > Sulfate, Earth Science > Atmosphere > Atmospheric Chemistry > Sulfur Compounds > Sulfur Dioxide, Earth Science > Atmosphere > Atmospheric Chemistry > Sulfur Compounds > Sulfur Oxides, Earth Science > Solid Earth > Tectonics > Volcanic Activity > Eruption Dynamics > Gas/Aerosol Dispersion, Earth Science Services > Environmental Advisories > Geological Advisories > Volcanic Activity, Earth Science Services > Models > Weather Research/Forecast Models, environmental, eruption, forecast, forecasting, gas, gas/aerosol, geological, hawaii, hawaiian, islands, latitude, longitude, main, mass, mass_concentration_of_sulfate_ambient_aerosol_particles_in_air, mass_concentration_of_sulfur_dioxide_in_air, measurement, mhi, model, models, O2, optical, optical properties, oxides, oxygen, particles, prediction, project, properties, quality, regional, research, research/forecast, science, services, so2, so4, solid, sulfate, sulfur, tectonics, time, university, vmap, vog, volcanic, weather, wrf";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "These model data were generated as part of an academic research project, and the principal investigator, Steven Businger (, asks to be informed of intent for scientific use and appropriate acknowledgment given in any publications arising therefrom. The data are provided free of charge, without warranty of any kind. The information contained in VMAP is for general information purposes only. While the VMAP team endeavors to keep the information accurate and up-to-date, they make no representations, warranties, or guarantees about the completeness, accuracy, reliability, suitability, or availability with respect to the VMAP data or the information, products, services, or related graphics derived therefrom for any purpose. Although every effort is made to avoid interruptions to VMAP access, any reliance upon such information is strictly at your own risk. In no event will the University of Hawaii at Manoa (UHM), the UHM Department of Atmospheric Sciences, the VMAP team, or any personnel or collaborator associated with VMAP or PacIOOS be liable for any losses or damages (direct or indirect) without limitation whatsoever in connection with the use of the VMAP data. The general public is welcome to use VMAP at this time with no expectation of accuracy or timeliness. The VMAP team welcomes constructive comments from all VMAP users, and strives to provide the best possible service consistent with their mission and resources. Inquiries into actual measured values and concerns regarding hazardous conditions should be directed to the appropriate agency such as the Hawaii State Department of Health. The VMAP data are intended to be complementary to the data provided by other state and federal agencies.";
    String locations "Continent > North America > United States Of America > Hawaii, Ocean > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands";
    String locations_vocabulary "GCMD Location Keywords";
    String Metadata_Link "";
    String naming_authority "org.pacioos";
    Float64 Northernmost_Northing 28.000000000001812;
    String platform "Models/Analyses > > Operational Models";
    String platform_vocabulary "GCMD Platform Keywords";
    String program "Vog Measurement and Prediction Project (VMAP)";
    String project "Vog Measurement and Prediction Project (VMAP)";
    String publisher_email "";
    String publisher_institution "University of Hawaii";
    String publisher_name "Pacific Islands Ocean Observing System (PacIOOS)";
    String publisher_type "group";
    String publisher_url "";
    String references ",,,";
    String source "Vog Measurement and Prediction Project (VMAP) model, HYbrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT), Weather Research and Forecast (WRF)";
    String sourceUrl "";
    Float64 Southernmost_Northing 13.0;
    String standard_name_vocabulary "CF Standard Name Table v39";
    String summary "The Vog Measurement and Prediction Project (VMAP) provides twice-daily forecasts of vog (volcanic smog) for the region surrounding the main Hawaiian islands at approximately 1-km resolution. Generated using the HYbrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) numerical dispersion model, VMAP uses estimates of volcano emissions along with forecast winds to predict the concentrations of sulfur dioxide gas (SO2) and sulfate aerosol particles (SO4) averaged over the lowest 100-m of the atmosphere downwind of the ongoing Kilauea eruption on Hawaii Island. Wind fields and thermodynamic forecast data produced by the Mauna Kea Weather Center (MKWC) from the state-of-the-art Weather Research and Forecast (Weather Research and Forecasting Model (WRF)) model, with a statewide resolution of 4.5 km, provide input for the HYSPLIT model. A combination of remote sensing and in situ observations are used to provide initial conditions regarding volcanic emissions and to validate the model simulations. Vog is a form of air pollution that results from volcanic emissions that is primarily a mixture of SO2 gas and SO4 aerosol. SO2 (invisible) reacts with oxygen and moisture in the air to produce SO4 aerosol (visible). SO2 is expected to be the main problem in areas near the vent (Hawaii Volcanoes National Park) while SO4 aerosol is expected to be the main problem at locations far from the vent (Kona and farther north and west).";
    String time_coverage_end "2015-10-09T12:00:00Z";
    String time_coverage_resolution "PT12H";
    String time_coverage_start "2015-10-08T00:00:00Z";
    String title "Vog Measurement and Prediction Project (VMAP) Regional Forecast Model: Main Hawaiian Islands, 0.01°, 2015";
    String type "Vog: SO2 and SO4 file";
    Float64 Westernmost_Easting -164.0;


Using griddap to Request Data and Graphs from Gridded Datasets

griddap lets you request a data subset, graph, or map from a gridded dataset (for example, sea surface temperature data from a satellite), via a specially formed URL. griddap uses the OPeNDAP (external link) Data Access Protocol (DAP) (external link) and its projection 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.

griddap request URLs must be in the form{?query}
For example,[(2002-06-01T09:00:00Z)][(-89.99):1000:(89.99)][(-179.99):1000:(180.0)]
Thus, the query is often a data variable name (e.g., analysed_sst), followed by [(start):stride:(stop)] (or a shorter variation of that) for each of the variable's dimensions (for example, [time][latitude][longitude]).

For details, see the griddap Documentation.

ERDDAP, Version 1.82
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