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Dataset Title:	Cloudmask, CLAVR-1, POES AVHRR, Alaska, Daytime (Hourly)
Dataset ID:	erdAKclddhday
Institution:	NOAA CoastWatch, West Coast Node
Information:	Summary | Variables | Background | Data Access Form

Graph Type:  lines linesAndMarkers markers surface X Axis:  longitude Y Axis:  latitude Color:  cloudmask Dimension Ranges    Start    Stop time (UTC)     specify just 1 value → altitude (m)     specify just 1 value → latitude (degrees_north) longitude (degrees_east) Graph Settings Color Bar: BlackBlueWhite BlackGreenWhite BlackRedWhite BlackWhite BlueWhiteRed BlueWideWhiteRed LightRainbow Ocean Rainbow Rainbow2 RedWhiteBlue RedWideWhiteBlue ReverseRainbow Topography WhiteBlueBlack WhiteGreenBlack WhiteRedBlack WhiteBlack    Continuity: Continuous Discrete    Scale: Linear Log       Min:    Max:    N Sections: 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Draw the land mask: under the data over the data

Things You Can Do With Your Graphs

• Web page authors can embed a graph of the latest data in a web page using HTML <img> tags.
• Anyone can use Slide Sorter to build a personal web page that displays graphs of the latest data, each in its own, draggable slide.
• Anyone can use or make Google Gadgets to display images with the latest data on their iGoogle home page.
   

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.12014528e+9, 1.2227976e+9;
    String axis "T";
    Int32 fraction_digits 0;
    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";
  }
  altitude {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "up";
    Float64 actual_range 0.0, 0.0;
    String axis "Z";
    Int32 fraction_digits 0;
    String ioos_category "Location";
    String long_name "Altitude";
    String positive "up";
    String standard_name "altitude";
    String units "m";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range 45.0, 75.0;
    String axis "Y";
    String coordsys "geographic";
    Int32 fraction_digits 4;
    String ioos_category "Location";
    String long_name "Latitude";
    String point_spacing "even";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range 165.0, 235.0;
    String axis "X";
    String coordsys "geographic";
    Int32 fraction_digits 4;
    String ioos_category "Location";
    String long_name "Longitude";
    String point_spacing "even";
    String standard_name "longitude";
    String units "degrees_east";
  }
  cloudmask {
    Float32 _FillValue -9999999.0;
    Float64 colorBarMaximum 255.0;
    Float64 colorBarMinimum 0.0;
    String coordsys "geographic";
    Int32 fraction_digits 0;
    String ioos_category "Meteorology";
    String long_name "Daytime Cloud Mask";
    Float32 missing_value -9999999.0;
    String standard_name "cloud_area_fraction";
    String units "8 bits, encoded";
  }
  NC_GLOBAL {
    String acknowledgement "NOAA NESDIS COASTWATCH, NOAA SWFSC ERD";
    String cdm_data_type "Grid";
    String composite "false";
    String contributor_name "NOAA NWS Monterey and NOAA CoastWatch";
    String contributor_role "Source of level 2 data.";
    String Conventions "COARDS, CF-1.0, Unidata Dataset Discovery v1.0";
    String creator_email "dave.foley@noaa.gov";
    String creator_name "NOAA CoastWatch, West Coast Node";
    String creator_url "http://coastwatch.pfel.noaa.gov";
    String date_created "2008-09-30Z";
    String date_issued "2008-09-30Z";
    Float64 Easternmost_Easting 235.0;
    Float64 geospatial_lat_max 75.0;
    Float64 geospatial_lat_min 45.0;
    Float64 geospatial_lat_resolution 0.0125;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 235.0;
    Float64 geospatial_lon_min 165.0;
    Float64 geospatial_lon_resolution 0.0125;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 0.0;
    Float64 geospatial_vertical_min 0.0;
    String geospatial_vertical_positive "up";
    String geospatial_vertical_units "m";
    String history 
"NOAA NWS Monterey and NOAA CoastWatch
2008-09-30T05:15:58Z NOAA CoastWatch (West Coast Node) and NOAA SFSC ERD
2009-11-23 http://192.168.31.18/thredds/dodsC/satellite/AK/cldd/hday
2009-11-23 http://coastwatch.pfeg.noaa.gov/griddap/erdAKclddhday.das";
    String infoUrl "http://coastwatch.pfeg.noaa.gov/infog/AK_cldd_las.html";
    String institution "NOAA CoastWatch, West Coast Node";
    String keywords "EARTH SCIENCE > Atmosphere > Clouds > Cloud Amount/Frequency";
    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, 
CoastWatch, 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.pfel.coastwatch";
    Float64 Northernmost_Northing 75.0;
    String origin "NOAA NWS Monterey and NOAA CoastWatch";
    String processing_level "3";
    String project "CoastWatch (http://coastwatch.noaa.gov/)";
    String projection "geographic";
    String projection_type "mapped";
    String references 
"CLAVR-1 Daytime Cloudmask Info: The CLAVR-1 cloudmask (Stowe, 1999) is used 
to cloudmask AVHRR high resolution sea surface temperature products.  The 
cloudmask runs a series of tests on each surface temperature pixel to 
determine whether the pixel is contaminated by cloud cover.  Users may 
evaluate which specific tests in the cloudmask returned positive cloud 
presence results by examining the value of the cloudmask.  This value 
corresponds to an 8 bit binary number which details which tests flagged the 
pixel as a cloudy pixel.  See http://coastwatch.pfel.noaa.gov/info/CLAVR.
html for more information regarding the specific tests used in the 
cloudmask.  CLAVR-1 Reference: Stowe, L. L., P. A. Davis, and E. P. 
McClain.  Scientific basis and initial evaluation of the CLAVR-1 global 
clear/cloud classification algorithm for the advanced very high resolution 
radiometer. J. Atmos. Oceanic Technol., 16, 656-681. 1999.";
    String satellite "POES";
    String sensor "AVHRR HRPT";
    String source "satellite observation: POES, AVHRR HRPT";
    String sourceUrl "http://192.168.31.18/thredds/dodsC/satellite/AK/cldd/hday";
    Float64 Southernmost_Northing 45.0;
    String standard_name_vocabulary "CF-1.0";
    String summary 
" The CLAVR-1 cloudmask (Stowe, 1999) is used to cloudmask AVHRR high 
resolution sea surface temperature products.  The cloudmask runs a series of 
tests on each surface temperature pixel to determine whether the pixel is 
contaminated by cloud cover.  Users may evaluate which specific tests in the 
cloudmask returned positive cloud presence results by examining the value of 
the cloudmask.  This value corresponds to an 8 bit binary number which 
details which tests flagged the pixel as a cloudy pixel.  See http://
coastwatch.pfel.noaa.gov/info/CLAVR.html for more information regarding the 
specific tests used in the cloudmask.";
    String title "Cloudmask, CLAVR-1, POES AVHRR, Alaska, Daytime (Hourly)";
    Float64 Westernmost_Easting 165.0;
  }
}

Using griddap to Request Data and Graphs from Gridded Datasets

griddap request URLs must be in the form
   http://coastwatch.pfeg.noaa.gov/erddap/griddap/ datasetID fileType {?query}
For example,
   http://coastwatch.pfeg.noaa.gov/erddap/griddap/erdBAssta5day.htmlTable?sst[(2007-10-21T00:00:00)][0][(-75):100:(75)][(180):100:(360)]

For details, see the griddap Documentation.
 
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