Make A Graph

Dataset Title:	Historic Land Cover Change, Area Vegetation, RF By time, latitude, longitude
Institution:	University of Illinois at Urbana-Champaign (Dataset ID: areaveg_rf_by_time_latitude_longitude)
Information:	Summary \| License \| Metadata \| Background \| Data Access Form

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Graph Type:
X Axis:
Y Axis:
Color:

Dimensions

Start

Stop

time (UTC)

specify just 1 value →

latitude (degrees_north)

longitude (degrees_east)

Graph Settings
Color Bar:	Continuity:	Scale:
Minimum:	Maximum:	N Sections:
Draw land mask:
Y Axis Minimum:	Maximum:

(Please be patient. It may take a while to get the data.)

Optional:
Then set the File Type: (File Type information)
and

or view the URL:
(Documentation / Bypass this form

)

Click on the map to specify a new center point.

Zoom:

[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:

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 {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range -6.2798112e+9, 1.1991456e+9;
    String axis "T";
    String bounds "time_bounds";
    String calendar "proleptic_gregorian";
    String ioos_category "Time";
    String long_name "Forecast time for ForecastModelRunCollection";
    Float64 missing_value NaN;
    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";
    Float32 actual_range -89.75, 89.75;
    String axis "Y";
    String bounds "latitude_bounds";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 89.75;
    Float32 valid_min -89.75;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range 0.25, 359.75;
    String axis "X";
    String bounds "longitude_bounds";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max 359.75;
    Float32 valid_min 0.25;
  }
  Dominant_type {
    String coordinates "time_run time latitude longitude";
    String flag_meanings "Tropical_Evergreen_Broadleaf_Forest Tropical_Deciduous_Broadleaf_Forest Temperate_Evergreen_Broadleaf_Forest Temperate_Evergreen_Needleleaf_Forest Temperate_Deciduous_Broadleaf_Forest Boreal_Evergreen_Needleleaf_Forest Boreal_Deciduous_Needleleaf_Forest Savanna Grassland_or_Steppe Shrubland Tundra Desert Polar-Desert_or_Rock_or_Ice Water_or_Rivers Cropland Pastureland Urbanland";
    Int16 flag_values 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17;
    String long_name "Dominant land cover type within each land grid cells";
    Int16 missing_value -99;
    String Note "The 28 land cover classes have been grouped into 17 broader categories for estimating dominant land-cover classes within each grid cell. \"Dominant land cover type\" is the land cover category that occupies the largest area within the grid cell";
  }
  TrpEBF {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Tropical Evergreen Broadleaf Forest";
  }
  TrpDBF {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Tropical Deciduous Broadleaf Forest";
  }
  TmpEBF {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Temperate Evergreen Broadleaf Forest";
  }
  TmpENF {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Temperate Evergreen Needleleaf Forest";
  }
  TmpDBF {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Temperate Deciduous Broadleaf Forest";
  }
  BorENF {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Boreal Evergreen Needleleaf Forest";
  }
  BorDNF {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Boreal Deciduous Needleleaf Forest";
  }
  Savanna {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Savanna";
  }
  C3grass {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Grasslands/Steppe following C3 photosynthetic pathway";
  }
  C4grass {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Grasslands/Steppe following C4 photosynthetic pathway";
  }
  Denseshrub {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Dense Shrublands";
  }
  Openshrub {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Open Shrublands";
  }
  Tundra {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Tundra";
  }
  Desert {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Desert";
  }
  PdRI {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Polar Desert/Rock/Ice";
  }
  SecTrpEBF {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Secondary Tropical Evergreen Broadleaf Forest";
  }
  SecTrpDBF {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Secondary Tropical Deciduous Broadleaf Forest";
  }
  SecTmpEBF {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Secondary Temperate Evergreen Broadleaf Forest";
  }
  SecTmpENF {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Secondary Temperate Evergreen Needleleaf Forest";
  }
  SecTmpDBF {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Secondary Temperate Deciduous Broadleaf Forest";
  }
  SecBorENF {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Secondary Boreal Evergreen Needleleaf Forest";
  }
  SecBorDNF {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Secondary Boreal Deciduous Needleleaf Forest";
  }
  Water {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Water/Rivers (over land grid cells)";
  }
  C3crop {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Cropland following C3 photosynthetic pathway";
  }
  C4crop {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Cropland following C4 photosynthetic pathway";
  }
  C3past {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Pastureland following C3 photosynthetic pathway";
  }
  C4past {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Pastureland following C4 photosynthetic pathway";
  }
  Urban {
    String comment "The units are in percentage of gridcell area";
    String coordinates "time_run time latitude longitude";
    String long_name "Urbanland";
  }
  NC_GLOBAL {
    String _CoordSysBuilder "ucar.nc2.dataset.conv.CF1Convention";
    String acknowledgement "This work was supported by National Aeronautics and Space Administration (NASA) Land Cover and Land Use Change Program (No. NNX08AK75G)";
    String cdm_data_type "Grid";
    String Comment "Cropland and Pastureland Data Source used in this netcdf file: Updated estimates based on Ramankutty and Foley (1999)";
    String contributor_role "Principle Investigator and originator";
    String Conventions "CF-1.4";
    String creator_email "meiyapp2@illinois.edu";
    String creator_name "Prasanth Meiyappan";
    String creator_url "http://www.atmos.illinois.edu/~meiyapp2";
    String data_set_progress "complete";
    String date_created "2013-08-30T20:59:09Z";
    String date_modified "2013-08-30T20:59:09Z";
    Float64 Easternmost_Easting 359.75;
    Float64 geospatial_lat_max 89.75;
    Float64 geospatial_lat_min -89.75;
    Float64 geospatial_lat_resolution 0.5;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 359.75;
    Float64 geospatial_lon_min 0.25;
    Float64 geospatial_lon_resolution 0.5;
    String geospatial_lon_units "degrees_east";
    String history 
"FMRC Best Dataset
2024-09-17T12:05:51Z https://www.ncei.noaa.gov/thredds/dodsC/ncFC/sat/landcover-RFAREAVEG-fc/Historical_Land-Cover_Change_and_Land-Use_Conversions_Global_Dataset:_RF_AREAVEG_Feature_Collection_best.ncd
2024-09-17T12:05:51Z https://www.ncei.noaa.gov/griddap/areaveg_rf_by_time_latitude_longitude.das";
    String id "land-cover_rf_landcover_yr2006.nc";
    String infoUrl "https://www.ncei.noaa.gov/thredds/catalog/ncFC/sat/landcover-RFAREAVEG-fc/catalog.html?dataset=ncFC/sat/landcover-RFAREAVEG-fc/Historical_Land-Cover_Change_and_Land-Use_Conversions_Global_Dataset:_RF_AREAVEG_Feature_Collection_best.ncd";
    String institution "University of Illinois at Urbana-Champaign";
    String Keywords "EARTH SCIENCE > AGRICULTURE > FOREST SCIENCE > AFFORESTATION/REFORESTATION, EARTH SCIENCE > AGRICULTURE > FOREST SCIENCE > REFORESTATION, EARTH SCIENCE > BIOSPHERE > TERRESTRIAL ECOSYSTEMS > AGRICULTURAL LANDS, EARTH SCIENCE > BIOSPHERE > TERRESTRIAL ECOSYSTEMS > DESERTS, EARTH SCIENCE > BIOSPHERE > TERRESTRIAL ECOSYSTEMS > FORESTS, EARTH SCIENCE > BIOSPHERE > TERRESTRIAL ECOSYSTEMS > GRASSLANDS, EARTH SCIENCE > BIOSPHERE > TERRESTRIAL ECOSYSTEMS > SHRUBLAND/SCRUB, EARTH SCIENCE > BIOSPHERE > TERRESTRIAL ECOSYSTEMS > URBAN LANDS, EARTH SCIENCE > BIOSPHERE > VEGETATION > AFFORESTATION/REFORESTATION, EARTH SCIENCE > BIOSPHERE > VEGETATION > DECIDUOUS VEGETATION, EARTH SCIENCE > BIOSPHERE > VEGETATION > DOMINANT SPECIES, EARTH SCIENCE > BIOSPHERE > VEGETATION > EVERGREEN VEGETATION, EARTH SCIENCE > BIOSPHERE > VEGETATION > VEGETATION COVER, EARTH SCIENCE > BIOSPHERE > VEGETATION > REFORESTATION, EARTH SCIENCE > HUMAN DIMENSIONS > HUMAN SETTLEMENTS > URBAN AREAS, EARTH SCIENCE > LAND SURFACE > LAND USE/LAND COVER > LAND COVER, EARTH SCIENCE > LAND SURFACE > LAND USE/LAND COVER > LAND USE CLASSES, EARTH SCIENCE > HUMAN DIMENSIONS > ENVIRONMENTAL GOVERNANCE/MANAGEMENT > LAND MANAGEMENT > LAND USE CLASSES, EARTH SCIENCE > HUMAN DIMENSIONS > ENVIRONMENTAL GOVERNANCE/MANAGEMENT > LAND MANAGEMENT > LAND USE/LAND COVER CLASSIFICATION, EARTH SCIENCE > LAND SURFACE > LANDSCAPE > REFORESTATION";
    String keywords_vocabulary "NASA Global Change Master Directory (GCMD) Earth Science Keywords, Version 8.0";
    String license "No constraints on data access or use";
    String location "Proto fmrc:Historical_Land-Cover_Change_and_Land-Use_Conversions_Global_Dataset:_RF_AREAVEG_Feature_Collection";
    String metadata_link "gov.noaa.ncdc:C00814";
    String naming_authority "gov.noaa.ncdc";
    Float64 Northernmost_Northing 89.75;
    String references "https://dx.doi.org/10.1007/s11707-012-0314-2, https://dx.doi.org/10.1111/gcb.12207";
    String source "model";
    String sourceUrl "https://www.ncei.noaa.gov/thredds/dodsC/ncFC/sat/landcover-RFAREAVEG-fc/Historical_Land-Cover_Change_and_Land-Use_Conversions_Global_Dataset:_RF_AREAVEG_Feature_Collection_best.ncd";
    Float64 Southernmost_Northing -89.75;
    String spatial_coverage "Global";
    String spatial_domain "land only; all ocean grid cells have been filled with the specified missing values";
    String spatial_resolution "0.5x0.5 degrees lat/lon";
    String standard_name_vocabulary "CF Standard name Table (v25, 05 July 2013)";
    String summary "Historic Land Cover Change, Area Vegetation, RF Dimensioned By time, latitude, longitude.";
    String time_coverage_duration "one year";
    String time_coverage_end "2008-01-01T00:00:00Z";
    String time_coverage_resolution "yearly";
    String time_coverage_start "1771-01-01T00:00:00Z";
    String title "Historic Land Cover Change, Area Vegetation, RF By time, latitude, longitude";
    String vertical_levels "surface observations";
    Float64 Westernmost_Easting 0.25;
    String years_of_record "1770/01 -2007/12";
  }
}

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.

(easy) You can get data by using the dataset's Data Access Form. It makes 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.

griddap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/griddap/erdBAssta5day.htmlTable?sst[(2007-10-21T00:00:00)][0][(-75):100:(75)][(180):100:(360)]
Thus, the query is often a data variable name (e.g., sst), followed by [(start):stride:(stop)] (or a shorter variation of that) for each of the variable's dimensions (for example, [time][altitude][latitude][longitude]).

For details, see the griddap Documentation.