数据访问表

数据集标题:	Estimated Seafloor Depth Gradients: ETOPO (US West Coast)
机构:	NOAA ERD (数据集 ID: erdEtopoSeafloorGradient)
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
latitude (degrees_north)	1801	0.01666667 (甚至)

longitude (degrees_east)	1501	0.01666667 (甚至)

网格变量（始终也会下载所有维度变量）

magnitude_gradient (Magnitude of Sea Floor Depth Gradient, m)

x_gradient (East-West Gradient of Sea Floor Depth, m)

y_gradient (North-South Gradient of Sea Floor Depth, m)

sea_floor_depth (m)

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 {
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range 20.0, 50.0;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String reference_datum "geographical coordinates, WGS84 projection";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 50.0;
    Float32 valid_min 20.0;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range 230.0, 255.0;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String reference_datum "geographical coordinates, WGS84 projection";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max 255.0;
    Float32 valid_min 230.0;
  }
  magnitude_gradient {
    Float64 colorBarMaximum 0.05;
    Float64 colorBarMinimum 0.0;
    String colorBarPalette "KT_amp";
    String ioos_category "Location";
    String long_name "Magnitude of Sea Floor Depth Gradient";
    Float32 missing_value NaN;
    String units "m";
  }
  x_gradient {
    Float64 colorBarMaximum 0.05;
    Float64 colorBarMinimum -0.03;
    String colorBarPalette "KT_balance";
    String ioos_category "Location";
    String long_name "East-West Gradient of Sea Floor Depth";
    Float32 missing_value NaN;
    String units "m";
  }
  y_gradient {
    Float64 colorBarMaximum 0.05;
    Float64 colorBarMinimum -0.03;
    String colorBarPalette "KT_balance";
    String ioos_category "Location";
    String long_name "North-South Gradient of Sea Floor Depth";
    Float32 missing_value NaN;
    String units "m";
  }
  sea_floor_depth {
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String ioos_category "Location";
    String long_name "Sea Floor Depth";
    Float32 missing_value NaN;
    String standard_name "sea_floor_depth";
    String units "m";
  }
  NC_GLOBAL {
    String _NCProperties "version=2,netcdf=4.6.2,hdf5=1.10.4";
    String cdm_data_type "Grid";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "erd.data@noaa.gov";
    String creator_name "NOAA NMFS SWFSC ERD";
    String creator_type "institution";
    String creator_url "https://www.pfeg.noaa.gov";
    Float64 Easternmost_Easting 255.0;
    Float64 geospatial_lat_max 50.0;
    Float64 geospatial_lat_min 20.0;
    Float64 geospatial_lat_resolution 0.016666666666666666;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 255.0;
    Float64 geospatial_lon_min 230.0;
    Float64 geospatial_lon_resolution 0.016666666666666666;
    String geospatial_lon_units "degrees_east";
    String history 
"created from etopousing python scikit-image canny algorithm, sigma = 10
2025-06-07T11:55:41Z (local files)
2025-06-07T11:55:41Z https://coastwatch.pfeg.noaa.gov/erddap/zh-CN/griddap/erdEtopoSeafloorGradient.das";
    String infoUrl "https://www.pfeg.noaa.gov";
    String institution "NOAA ERD";
    String keywords "bathymetry, data, depth, earth, Earth Science > Oceans > Bathymetry/Seafloor Topography > Bathymetry, east, east-west, erd, estimatedetoposea, floor, gradient, magnitude, magnitude_gradient, noaa, north, north-south, ocean, oceans, science, sea, sea_floor_depth, seafloor, south, topography, west, x_gradient, y_gradient";
    String keywords_vocabulary "GCMD Science Keywords";
    String license 
"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.
";
    Float64 Northernmost_Northing 50.0;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 20.0;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "Estimated sea_floor depth  x-gradient, y-gradient and gradient magnitude using the Python scikit-image canny algorithm with sigma = 7.5, x-gradient, y-gradient and gradient magnitude. For the code used to create this dataset (and a description), see https://rmendels.github.io/seafloor_gradient_doc.html .";
    String title "Estimated Seafloor Depth Gradients: ETOPO (US West Coast)";
    Float64 Westernmost_Easting 230.0;
  }
}

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.