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| Dataset Title: | X - Experimental LaRA (Laser/Radar Altimeter) snow depth 5-year monthly mean (using ESA/CS-2 standard algorithm), Arctic, 25km, 2018-2023 (winter) 
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| Institution: | NOAA NESDIS STAR (Dataset ID: lara_snowdepth_5yrs_esa_nh) |
| Information: | Summary
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Attributes {
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.5157152e+9, 1.5445728e+9;
String axis "T";
String calendar "proleptic_gregorian";
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";
}
ygrid {
UInt32 _ChunkSizes 448;
Float32 _FillValue NaN;
Float32 actual_range -5337500.0, 5837500.0;
String axis "Y";
String ioos_category "Location";
String long_name "Projection Grid Y Centers";
String standard_name "projection_y_coordinate";
String units "m";
Float32 valid_range -5350000.0, 5850000.0;
}
xgrid {
UInt32 _ChunkSizes 304;
Float32 _FillValue NaN;
Float32 actual_range -3837500.0, 3737500.0;
String axis "X";
String ioos_category "Location";
String long_name "Projection Grid X Centers";
String standard_name "projection_x_coordinate";
String units "m";
Float32 valid_range -3850000.0, 3750000.0;
}
LaRA_sd_5yr {
UInt32 _ChunkSizes 1, 448, 304;
Float64 _FillValue NaN;
String comment "use: Data use policy: In publications, presentations, or on web pages based on STAR data the following acknowledgment should be included: 'LaRA snow depth data are provided by NOAA / NESDIS Center for Satellite Applications and Research (STAR).'";
String coordinates "xgrid ygrid";
String grid_mapping "projection";
String ioos_category "Statistics";
String long_name "LaRA Snow Depth 5yr mean";
String units "meter";
}
grid_lat {
Float64 _FillValue NaN;
String coordinates "xgrid ygrid";
String grid_mapping "projection";
String ioos_category "Location";
String long_name "Grid Lat";
}
grid_lon {
Float64 _FillValue NaN;
String ioos_category "Location";
String long_name "Grid Lon";
}
NC_GLOBAL {
String acknowledgement "Users are free to use the information hosted on this site in their research, provided credit is given to the NOAA / NESDIS Center for Satellite Applications and Research (STAR). Users are also asked to cite the following publication whenever these data are used: \"Revisiting snow depth on Arctic sea ice from combined ICESat-2 and CryoSat-2 freeboard observations\" by Donghui Yi, Sinead L. Farrell, Laurence Connor, Alejandro Egido, Dexin Zhang, Eric Leuliette, John Kuhn and Kelly M. Frank. Submitted to IEEE Transactions on Geoscience and Remote Sensing, Under Review";
String cdm_data_type "Grid";
String cdr_variable "LaRA_sd_5yr";
String climatology_end "2023-04-31T23:59:59Z";
String climatology_start "2018-11-01T00:00:00Z";
String comment "The monthly mean covers winter months (November-April) averaged over 2018-2023.";
String Conventions "CF-1.6, ACDD-1.3, COARDS";
String creator_email "laurence dot connor at noaa.gov";
String creator_name "NOAA NESDIS STAR";
String creator_type "institution";
String creator_url "https://www.star.nesdis.noaa.gov/socd/lsa/";
String date_created "2024-01-01";
String defaultGraphQuery "LaRA_sd_5yr[(last):(last)][(-5337500.0)][(3737500.0)]&.draw=surface";
UInt32 grid_mapping__ChunkSizes 1;
Float64 grid_mapping_false_easting 0.0;
Float64 grid_mapping_false_northing 0.0;
String grid_mapping_GeoTransform "-3850000.0 25000.0 0 5850000.0 0 -25000.0";
Float64 grid_mapping_grid_boundary_bottom_projected_y -5350000.0;
Float64 grid_mapping_grid_boundary_left_projected_x -3850000.0;
Float64 grid_mapping_grid_boundary_right_projected_x 3750000.0;
Float64 grid_mapping_grid_boundary_top_projected_y 5850000.0;
Float64 grid_mapping_latitude_of_projection_origin 90.0;
Float64 grid_mapping_longitude_of_projection_origin -45.0;
String grid_mapping_name "polar_stereographic";
Float64 grid_mapping_parent_grid_cell_column_subset_end 304.0;
Float64 grid_mapping_parent_grid_cell_column_subset_start 0.0;
Float64 grid_mapping_parent_grid_cell_row_subset_end 448.0;
Float64 grid_mapping_parent_grid_cell_row_subset_start 0.0;
String grid_mapping_proj4text "+proj=stere +lat_0=90 +lat_ts=70 +lon_0=-45 +k=1 +x_0=0 +y_0=0 +a=6378273 +b=6356889.449 +units=m +no_defs";
Float64 grid_mapping_scaling_factor 1.0;
Float64 grid_mapping_semimajor_radius 6378273.0;
Float64 grid_mapping_semiminor_radius 6356889.449;
String grid_mapping_spatial_ref "PROJCS[\"NSIDC Sea Ice Polar Stereographic North\",GEOGCS[\"Unspecified datum based upon the Hughes 1980 ellipsoid\",DATUM[\"Not_specified_based_on_Hughes_1980_ellipsoid\",SPHEROID[\"Hughes 1980\",6378273,298.279411123061,AUTHORITY[\"EPSG\",\"7058\"]],AUTHORITY[\"EPSG\",\"6054\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.01745329251994328,AUTHORITY[\"EPSG\",\"9122\"]],AUTHORITY[\"EPSG\",\"4054\"]],UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]],PROJECTION[\"Polar_Stereographic\"],PARAMETER[\"latitude_of_origin\",70],PARAMETER[\"central_meridian\",-45],PARAMETER[\"scale_factor\",1],PARAMETER[\"false_easting\",0],PARAMETER[\"false_northing\",0],AUTHORITY[\"EPSG\",\"3411\"],AXIS[\"X\",UNKNOWN],AXIS[\"Y\",UNKNOWN]]";
String grid_mapping_srid "urn:ogc:def:crs:EPSG::3411";
Float64 grid_mapping_standard_parallel 70.0;
Float64 grid_mapping_straight_vertical_longitude_from_pole 135.0;
String grid_mapping_units "meters";
String history
"02/29/2024 V1 data file created
2025-05-07T12:05:42Z (local files)
2025-05-07T12:05:42Z https://polarwatch.noaa.gov/erddap/griddap/lara_snowdepth_5yrs_esa_nh.das";
String infoUrl "https://www.star.nesdis.noaa.gov/socd/lsa/SeaIce/LaRaSnowDepth.php";
String institution "NOAA NESDIS STAR";
String keywords "algorithms, altimetry, Arctic, EARTH SCIENCE>CLIMATE INDICATORS>CRYOSPHERIC INDICATORS>SNOW DEPTH, remote sensing, sea ice, snow depth";
String keywords_vocabulary "GCMD Science Keywords";
String license "Creative Commons CC0 (CC 1.0)";
String platform "ICESat-2, CryoSat-2";
String processing_level "NOAA Level 3";
String product_version "v1";
String program "NOAA/Laboratory for Satellite Altimetry";
String proj_crs_code "EPSG:3411";
String project "Arctic snow depth from combined ICESat-2 and Cryosat-2 freeboard observations";
String references "Revisiting snow depth on Arctic sea ice from combined ICESat-2 and CryoSat-2 freeboard observations\" by Donghui Yi, Sinead L. Farrell, Laurence Connor, Alejandro Egido, Dexin Zhang, Eric Leuliette, John Kuhn and Kelly M. Frank. Submitted to IEEE Transactions on Geoscience and Remote Sensing, Under Review";
String sensor "Radar altimeter, Laser altimeter";
String source "https://www.star.nesdis.noaa.gov/data/socd3/lsa/SeaIceProducts/LaRa/";
String sourceUrl "(local files)";
String spatial_resolution "25km";
String standard_name_vocabulary "CF Standard Name Table v70";
String summary "Laser/Radar Altimeter (LaRA) Arctic Snow Depth (ESA version) is a five-year mean representation of Arctic snow depth on sea ice calculated using complementary observations of Arctic sea ice from laser and radar satellite altimeters. CryoSat-2 freeboards from the ESA standard algorithm were combined with ICESat-2 freeboards to derive LaRA snow depths over the Arctic Ocean. Monthly mean LaRA snow depths covering winter months (November through April) were averaged over five winters spanning 2018-2023 to create 5-year snow depth means for each winter month. CryoSat-2 Baseline-E L1A/L2 and ICESat-2 ATL07/10 release 6 data were used in development. Sea ice concentration data from the National Snow and Ice Data Center (NSIDC) and sea surface type data from OSI SAF were used as ancillary data.";
String time_coverage_duration "P5Y";
String time_coverage_end "2018-12-12T00:00:00Z";
String time_coverage_resolution "P1M";
String time_coverage_start "2018-01-12T00:00:00Z";
String title "X - Experimental LaRA (Laser/Radar Altimeter) snow depth 5-year monthly mean (using ESA/CS-2 standard algorithm), Arctic, 25km, 2018-2023 (winter)";
}
}
Data Access Protocol (DAP) and its
projection 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.
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.