NOAA PolarWatch ERDDAP
Easier access to scientific data
   ?    
Brought to you by NOAA NMFS SWFSC ERD    

ERDDAP > griddap > Data Access Form ?

Dataset Title:  Normalized Radar Cross Section, SAR Composite, Near Real-Time, 1km, North
Pole, Daily
Subscribe RSS
Institution:  NOAA/NESDIS/STAR/SOCD   (Dataset ID: noaacwSARnrcsnpoleDaily)
Information:  Summary ? | License ? | Metadata | Background (external link) | Files | Make a graph
 
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 time (UTC) ?      203    1 day 0h 21m 23s (uneven)
  < slider >
 level (Altitude, m) ?      1    (just one value)
  < slider >
 y (m) ?      10998    1000.0 (even)
  < slider >
 x (m) ?      10998    1000.0 (even)
  < slider >
 
Grid Variables (which always also download all of the dimension variables) 
 NRCS (Normalized Radar Cross Section, 1) ?

File type: (more information)

(Documentation / Bypass this form) ?
 
(Please be patient. It may take a while to get the data.)


 

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.646524799e+9, 1.664236799e+9;
    String axis "T";
    String CoordinateAxisType "Time";
    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";
  }
  level {
    String _Unsigned "false";
    Byte actual_range 0, 0;
    String axis "Z";
    String ioos_category "Location";
    String long_name "Altitude";
    String positive "up";
    String standard_name "altitude";
    String units "m";
  }
  y {
    Float32 actual_range -5498550.0, 5498450.0;
    String axis "Y";
    String comment "y values are the centers of the grid cells";
    String ioos_category "Location";
    String long_name "y coordinate of projection";
    String standard_name "projection_y_coordinate";
    String units "m";
  }
  x {
    Float32 actual_range -5498550.0, 5498450.0;
    String axis "X";
    String comment "x values are the centers of the grid cells";
    String ioos_category "Location";
    String long_name "x coordinate of projection";
    String standard_name "projection_x_coordinate";
    String units "m";
  }
  NRCS {
    Float32 _FillValue NaN;
    String comment "Values of sigma naught (sigma0) in dB";
    String ioos_category "Unknown";
    String long_name "Normalized Radar Cross Section";
    Float32 missing_value NaN;
    String short_name "NRCS Sigma0 (dB)";
    String standard_name "surface_backwards_scattering_coefficient_of_radar_wave";
    String units "1";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String contributor_name "NOAA STAR, U.S. National Ice Center";
    String contributor_role "Producer, Publisher, Advisor, Software Developer, Originator";
    String Conventions "CF-1.6, ACCD-1.3, COARDS, ACDD-1.3";
    String creator_email "sean.helfrich@noaa.gov,christopher.jackson@noaa.gov,tyler.ruff@noaa.gov";
    String creator_institution "NOAA/NESDIS/STAR/SOCD";
    String creator_name "NOAA STAR SOCD Water Surface Conditions/SAR Team";
    String creator_type "institution";
    String creator_url "https://www.star.nesdis.noaa.gov/socd/mecb/sar/index.html";
    String cw_projection "Polar Stereographic";
    String cw_software_name "SAR Operational Product System";
    String cw_software_version "3";
    String date_created "2022-09-27T14:00:14Z";
    Int32 frame_count 438;
    Float64 grid_mapping_false_easting 0.0;
    Float64 grid_mapping_false_northing 0.0;
    Float64 grid_mapping_inverse_flattening 298.257223563;
    Float64 grid_mapping_latitude_of_projection_origin 90.0;
    String grid_mapping_name "polar_stereographic";
    String grid_mapping_proj4 "+proj=stere +lat_0=90 +lat_ts=60 +lon_0=-45 +k=1 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs";
    Float64 grid_mapping_semi_major_axis 6378137.0;
    String grid_mapping_spatial_ref "PROJCS[\"unknown\",GEOGCS[\"unknown\",DATUM[\"WGS_1984\",SPHEROID[\"WGS 84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY[\"EPSG\",\"6326\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]]],PROJECTION[\"Polar_Stereographic\"],PARAMETER[\"latitude_of_origin\",60],PARAMETER[\"central_meridian\",-45],PARAMETER[\"false_easting\",0],PARAMETER[\"false_northing\",0],UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]],AXIS[\"Easting\",SOUTH],AXIS[\"Northing\",SOUTH]]";
    Float64 grid_mapping_standard_parallel 60.0;
    Float64 grid_mapping_straight_vertical_longitude_from_pole -45.0;
    String grid_mapping_units "m";
    String history 
"27 September 2022 14:00Z: NetCDF file generated from file NRCS_Composite_1kmCR_2022269T0000_2022269T2359_N438_4Byte.dat
2022-09-29T12:08:06Z (local files)
2022-09-29T12:08:06Z https://polarwatch.noaa.gov/erddap/griddap/noaacwSARnrcsnpoleDaily.das";
    String infoUrl "https://www.star.nesdis.noaa.gov/socd/mecb/sar/index.html";
    String institution "NOAA/NESDIS/STAR/SOCD";
    String instrument "C-SAR";
    String keywords "active, aperture, arctic, backscatter, backwards, c-sar, coefficient, composite, cross, cryosphere, data, earth, EARTH REMOTE SENSING INSTRUMENTS > ACTIVE REMOTE SENSING > IMAGING RADARS > C-SAR, Earth Science > Cryosphere > Sea Ice > Ice Extent, Earth Science > Spectral/Engineering > Radar > Radar Backscatter, engineering, environmental, extent, geographic, GEOGRAPHIC REGION > ARCTIC, GEOGRAPHIC REGION > NORTHERN HEMISPHERE, GEOGRAPHIC REGION > POLAR, hemisphere, ice, imaging, information, instruments, level, national, nesdis, noaa, normalized, northern, NRCS, polar, radar, radars, region, remote, sar, satellite, scattering, science, sea, section, sensing, service, socd, spectral, star, surface, surface waves, surface_backwards_scattering_coefficient_of_radar_wave, synthetic, time, wave, waves";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "Contains modified Copernicus Sentinel data 2022 (https://sentinel.esa.int/documents/247904/690755/Sentinel_Data_Legal_Notice/). Sentinel data is obtained from https://scihub.copernicus.eu/dhus. RADARSAT Constellation Mission Imagery Copyright Government of Canada 2022. RCM data is obtained from https://www.eodms-sgdot.nrcan-rncan.gc.ca/index-en.html. RADARSAT-2 Data and Products Copyright MDA Geospatial Services Inc. 2022 - All Rights Reserved. RADARSAT is an official mark of the Canadian Space Agency. RADARSAT-2 data is provided by https://mda.space/en/. 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.";
    String naming_authority "gov.noaa.ncei";
    String platform "SENTINEL-1A/B,RADARSAT-2,RADARSAT";
    String platform_vocabulary "NASA Global Change Master Directory (GCMD) Keywords, Version 9.0";
    String processing_level "NOAA Level 2";
    String product_version "1";
    String project "SAR Operational Product System";
    String publisher_institution "NOAA STAR";
    String publisher_name "NOAA STAR";
    String publisher_type "institution";
    String publisher_url "https://www.star.nesdis.noaa.gov/";
    String references "Synthetic Aperture Radar Marine Users Manual. Ed C.R Jackson and J.R. Apel: NOAA: Washington, DC, USA, 2004. ISBN 0-16-073214-X";
    String source "SENTINEL-1A/1B, RADARSAT-2, and RADARSAT Contellation Mission SAR imagery";
    String sourceUrl "(local files)";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "This file contains a composite of Synthetic Aperture Radar (SAR) Normalized Radar Cross Section (NRCS) images covering the Arctic for a period of one day. The files are produced in SAROPS (SAR Operational Product System) by the Water Surface Conditions/Sea Surface Roughness group within the NOAA STAR Satellite Oceanography and Climatology Division. Data from the following C-Band SAR systems are included: Sentinel-1A/B, RADARSAT-2, and RADARSAT Constellation Mission. NRCS values have been calibrated with values given by the SAR data provider. Daily coverage may vary due to limitations in data availability.";
    String testOutOfDate "now-3days";
    String time_coverage_duration "P1D";
    String time_coverage_end "2022-09-26T23:59:59Z";
    String time_coverage_resolution "P1D";
    String time_coverage_start "2022-03-05T23:59:59Z";
    String title "Normalized Radar Cross Section, SAR Composite, Near Real-Time, 1km, North Pole, Daily";
  }
}

 

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
https://coastwatch.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/griddap/jplMURSST41.htmlTable?analysed_sst[(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 2.19
Disclaimers | Privacy Policy | Contact