ifpServer D2D Satellite netCDF File Format

There are no variable attributes that are used by GFESuite in the D2D satellite data files.

 
The following netCDF global attributes are required in order for the ifpServer to recognize the netCDF file as valid:

Attribute	Description	Required by GFESuite?
projName	Contains the projection name.  Must be one of the following: LAMBERT_CONFORMAL, MERCATOR, STEREOGRAPHIC, LATLON, CYLINDRICAL_EQUIDISTANT	Yes
lon00	Longitude in degrees of lower-left grid point (0, 0)	Yes
lat00	Latitude in degrees of lower-left grid point (0, 0)	Yes
latNxNy	Latitude in degrees of upper-right grid point (maxX, maxY)	Yes
lonNxNy	Longitude in degrees of upper-right grid point (maxX, maxY)	Yes
centralLon	Center longitude for the mercator projection, where the mercator projection is parallel to the Earth's surface. Center longitude for the polar stereographic and Lambert Conformal projections, where the projection has north as straight up.	Yes
centralLat	Center latitude for the polar stereographic and Lambert Conformal projections, where the plane intersects the Earth's surface.	Yes

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Diagnosing Access Problems

If you point the ifpServer to a D2D satellite directory and the data is not appearing, verify that:

• the file name is in the standard format of yyyymmdd_hhmm, which is the image valid time
• that the file contains all of the required variables, dimensions, and attributes as outlined above
• that there isn't more than ONE directory in the SATDIRS configuration containing files that have an variable called "model" with the same name

If all else fails, you can turn on the debugging logging option in the ifpServer.  In this mode the ifpServer will log all problems it finds with model data files.  To turn on this feature, perform the following steps:

1. Edit the file release/etc/BASE/logPref/ifpServer.logPref, where release is the installation directory. On AWIPS-baseline equipment this file is located at /awips/GFESuite/primary/etc/BASE/logPref/ifpServer.logPref.  Add the following line in the middle of the file (before the prefix section).  Refer to the log files document for details. Add an entry:     all  D2DFile.C  file debug = on
2. Stop and restart the ifpServer.
3. Look in the server log files.  It will show the problems for all files it finds.  If it doesn't identify your file or directory, recheck your SATDIRS to be sure you have set it up correctly.

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Example of ncdump

This is an example ncdump from a water vapor D2D file; each directory contains one band (wavelength), each file contains one image:

netcdf 20031112_2130 {
dimensions:
        y = 640 ;
        x = 550 ;
variables:
        byte image(y, x) ;
        double validTime ;
                validTime:units = "seconds since 1970-1-1 00:00:00.00 0:00" ;
                validTime:long_name = "Valid Time" ;
        byte valid100thSecs ;
                valid100thSecs:units = "centiseconds" ;
                valid100thSecs:long_name = "Valid 100th of a second" ;

// global attributes:
                :channel = "6.7 micron" ;
                :depictorName = "westConus@17659725" ;
                :projIndex = 3 ;
                :projName = "LAMBERT_CONFORMAL" ;
                :centralLat = 25.f ;
                :centralLon = -95.f ;
                :rotation = 25.f ;
                :xMin = -0.2556496f ;
                :xMax = 0.01474848f ;
                :yMin = -0.8768771f ;
                :yMax = -0.5622397f ;
                :lat00 = 54.53548f ;
                :lon00 = -152.8565f ;
                :latNxNy = 17.51429f ;
                :lonNxNy = -92.71996f ;
                :dxKm = 7.871384f ;
                :dyKm = 7.869175f ;
                :latDxDy = 39.25658f ;
                :lonDxDy = -117.4858f ;
}

data:

 image =
  0, -70, -70, -71, -70, -70, -70, -70, -71, -71, -71, -70, -70, -70, -69,
    -70, -71, -70, -70, -71, -71, -71, -71, -70, -69, -70, -71, -71, -72,
    -71, -71, -71, -71, -72, -72, -71, -71, -71, -72, -72, -71, -71, -70,
    -71, -72, -72, -72, -73, -73, -72, -72, -71, -70, -71, -71, -71, -70,
    -70, -70, -69, -69, -69, -69, -69, -69, -69, -69, -69, -69, -69, -69,
    -68, -68, -67, -69, -69, -68, -68, -67, -67, -67, -67, -67, -67, -67,
    -67, -66, -66, -67, -67, -67, -68, -68, -68, -68, -68, -68, -68, -68,
    -68, -68, -68, -68, -68, -68, -68, -68, -68, -67, -67, -66, -67, -66,
    -65, -64, -64, -63, -63, -62, -63, -62, -60, -61, -61, -61, -61, -61,
    -60, -61, -61, -61, -61, -61, -60, -61, -61, -60, -61, -62, -61, -60,
    -60, -60, -60, -60, -60, -59, -60, -61, -61, -61, -60, -60, -60, -60,
    -60, -59, -59, -59, -59, -58, -58, -58, -59, -58, -58, -57, -56, -57,
    -57, -57, -57, -56, -56, -56, -55, -55, -55, -55, -55, -55, -55, -56,
    -55, -55, -56, -56, -56, -56, -57, -57, -57, -57, -58, -58, -59, -59,
    -59, -59, -59, -60, -60, -61, -61, -61, -61, -61, -61, -61, -61, -61,