数据访问表

数据集标题:	VIIRSN, Suomi-NPP, Level-3 SMI, NASA, Global, 4km, PIC, R2018, 2012-present, Daily
机构:	NASA/GSFC OBPG (数据集 ID: erdVH2018pic1day)
信息:	概括 \| 执照 \| FGDC \| ISO 19115 \| 元数据 \| 背景 \| 文件 \| 制作图表

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方面	尺寸	间距
time (Centered Time, UTC)	3858	1 day 0h 0m 22s (不均匀的)

latitude (degrees_north)	4320	-0.04166667 (甚至)

longitude (degrees_east)	8640	0.04166667 (甚至)

网格变量（始终也会下载所有维度变量）

pic (Calcite Concentration, Balch and Gordon, mol m^-3)

文件类型： (更多信息)

(Documentation / Bypass this form)

（请耐心等待，获取数据可能需要一段时间。）

此数据集的数据集属性结构 (.das)

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.3255056e+9, 1.6588368e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Centered 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";
    Float32 actual_range -89.97917, 89.97916;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 90.0;
    Float32 valid_min -90.0;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -179.9792, 179.9792;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max 180.0;
    Float32 valid_min -180.0;
  }
  pic {
    Float32 _FillValue -5.34e-4;
    Float64 colorBarMaximum 0.001;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Ocean Color";
    String long_name "Calcite Concentration, Balch and Gordon";
    String reference "Balch, W.M., Gordon, H.R., Bowler, B.C., Drapeau, D.T., and Booth, E.S. (2005), Calcium carbonate measurements in the surface global ocean based on Moderate-Resolution Imaging Spectroradiometer data, J. Geophys. Res., 110, C07001, doi:10.1029/2004JC002560; Gordon, H.R. Boynton, G.C., Balch, W.M., Groom, S.B., Harbour, D.S., Smyth, T.J., Retrieval of Coccolithophore Calcite Concentration from SeaWiFS Imagery, GRL, 28, 8, 1587-1590.";
    String units "mol m^-3";
    Float32 valid_max 0.125;
    Float32 valid_min 0.0;
  }
  NC_GLOBAL {
    String _lastModified "2022-08-13T00:44:39.000Z";
    String cdm_data_type "Grid";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_email "data@oceancolor.gsfc.nasa.gov";
    String creator_name "NASA/GSFC/OBPG";
    String creator_type "group";
    String creator_url "https://oceandata.sci.gsfc.nasa.gov";
    String date_created "2022-08-13T00:44:39.000Z";
    Float64 Easternmost_Easting 179.9792;
    Float64 geospatial_lat_max 89.97916;
    Float64 geospatial_lat_min -89.97917;
    Float64 geospatial_lat_resolution 0.04166666589488307;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.9792;
    Float64 geospatial_lon_min -179.9792;
    Float64 geospatial_lon_resolution 0.041666674383609215;
    String geospatial_lon_units "degrees_east";
    String history 
"SNPP data files are downloaded ASAP from https://oceandata.sci.gsfc.nasa.gov/VIIRS-SNPP/Mapped/Daily/4km/pic/ to NOAA NMFS SWFSC ERD (erd.data@noaa.gov).
NOAA NMFS SWFSC ERD (erd.data@noaa.gov) uses ERDDAP to add the time variable and slightly modify the metadata.
Direct read of HDF4 file through CDM library.
2025-05-05T12:23:07Z https://oceandata.sci.gsfc.nasa.gov/VIIRS-SNPP/Mapped/Daily/4km/pic/
2025-05-05T12:23:07Z https://coastwatch.pfeg.noaa.gov/erddap/zh-CN/griddap/erdVH2018pic1day.das";
    String identifier_product_doi "10.5067/NPP/VIIRS/L3M/PIC/2018";
    String identifier_product_doi_authority "https://dx.doi.org";
    String infoUrl "https://oceancolor.gsfc.nasa.gov/data/viirs-snpp/";
    String institution "NASA/GSFC OBPG";
    String instrument "VIIRS";
    String keywords "4km, carbon, chemistry, color, concentration, daily, gsfc, image, inorganic, joint, jpss, level, level-3, mapped, mass, mean, nasa, noaa, npoess, npp, obpg, ocean, ocean color, oceans, orbiting, particulate, pic, polar, satellite, sea, seawater, smi, standard, suomi, viirs, viirsn, water";
    String keywords_vocabulary "GCMD Science Keywords";
    String l2_flag_names "ATMFAIL,LAND,HISATZEN,STRAYLIGHT,CLDICE,LOWLW,NAVWARN,HISOLZEN,NAVFAIL,FILTER,HIGLINT";
    String license 
"https://science.nasa.gov/earth-science/earth-science-data/data-information-policy/
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 map_projection "Equidistant Cylindrical";
    String measure "Mean";
    String naming_authority "gov.noaa.pfeg.coastwatch";
    Float64 Northernmost_Northing 89.97916;
    String platform "Suomi-NPP";
    String processing_level "L3 Mapped";
    String processing_version "2018.0";
    String project "Ocean Biology Processing Group (NASA/GSFC/OBPG)";
    String publisher_email "data@oceancolor.gsfc.nasa.gov";
    String publisher_name "NASA/GSFC/OBPG";
    String publisher_url "https://oceandata.sci.gsfc.nasa.gov";
    String reference "Balch, W.M., Gordon, H.R., Bowler, B.C., Drapeau, D.T., and Booth, E.S. (2005), Calcium carbonate measurements in the surface global ocean based on Moderate-Resolution Imaging Spectroradiometer data, J. Geophys. Res., 110, C07001, doi:10.1029/2004JC002560; Gordon, H.R. Boynton, G.C., Balch, W.M., Groom, S.B., Harbour, D.S., Smyth, T.J., Retrieval of Coccolithophore Calcite Concentration from SeaWiFS Imagery, GRL, 28, 8, 1587-1590.";
    String sourceUrl "https://oceandata.sci.gsfc.nasa.gov/VIIRS-SNPP/Mapped/Daily/4km/pic/";
    Float64 Southernmost_Northing -89.97917;
    String spatialResolution "4.64 km";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "R2018 of Level-3 Standard Mapped Image (SMI), Global, 4km, Particulate Inorganic Carbon (PIC), Daily composite data from the Visible and Infrared Imager/Radiometer Suite (VIIRS), as processed by NASA GSFC Ocean Biology Processing Group (OBPG). VIIRS is a multi-disciplinary instrument that flies on the Suomi-NPP (National Polar-orbiting Partnership) satellite.  Suomi-NPP is the initial spacecraft in the JPSS (Joint Polar Satellite Systems) series of spacecraft. JPSS is our Nation's next generation polar-orbiting operational environmental satellite system. JPSS is a collaborative program between NOAA and its acquisition agent NASA. VIIRS is the successor to MODIS for Earth science data product generation. (This version of the VH data was first released on 2017-12-12.)";
    String temporal_range "day";
    String testOutOfDate "now-3days";
    String time_coverage_end "2022-07-26T12:00:00Z";
    String time_coverage_start "2012-01-02T12:00:00Z";
    String title "VIIRSN, Suomi-NPP, Level-3 SMI, NASA, Global, 4km, PIC, R2018, 2012-present, Daily";
    Float64 Westernmost_Easting -179.9792;
  }
}

使用 griddap 从网格数据集请求数据和图表

griddap允许您通过特殊格式的 URL 从网格数据集中请求数据子集、图表或地图（例如，来自卫星的海面温度数据）。griddap 使用OPeNDAP (external link)

数据访问协议 (DAP ) (external link)

及其投影约束

。

URL 指定您想要的内容：数据集、图表或数据子集的描述以及响应的文件类型。

（简单）您可以使用数据集的数据访问表单获取数据。它会为您生成 URL。
（简单）您可以使用数据集的“制作图表”表单制作图表或地图。它会为您生成 URL。
（不难）您可以绕过表格并获取数据，或者通过手动生成 URL 或使用计算机程序或脚本来制作图形或地图。

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.