Package ucar.nc2.iosp.noaa

Class Ghcnm

  • All Implemented Interfaces:
    Comparable<IOServiceProvider>, IOServiceProvider
    public class Ghcnm
extends AbstractIOServiceProvider
    Nomads GLOBAL HISTORICAL CLIMATOLOGY NETWORK MONTHLY (GHCNM) v3 Beta. Ascii file. Write index into .ncsx using protobug (experimental) IOSP can then recognize the ncsx file, so it can be passed into NetdfFile.open() instead of the ascii file. Otherwise you have to explicitly specify the iosp, eg:

    The index has list of stations and offsets into station file and data file. since the data file has one station's data grouped together, this efficiently answers "get all data for station". One could sort datafile by time, and add time index, to answer "get all data for time range". 

     Protobuf generation:
 cd c:/dev/tds4.2/thredds/cdm/src/main/java
 protoc --proto_path=. --java_out=. ucar/nc2/iosp/noaa/GhcnmIndex.proto
    LOOK probable file leaks
    Since:
    Dec 8, 2010

    • Constructor Detail

      • Ghcnm

        public Ghcnm()

    • Method Detail

      • isValidFile

        public boolean isValidFile​(RandomAccessFile raf)
                    throws IOException
        Description copied from interface: IOServiceProvider
        Check if this is a valid file for this IOServiceProvider. You must make this method thread safe, ie dont keep any state.
        Parameters:
        raf - RandomAccessFile
        Returns:
        true if valid.
        Throws:
        IOException - if read error

      • open

        public void open​(RandomAccessFile raf,
                 NetcdfFile ncfile,
                 CancelTask cancelTask)
          throws IOException
        Description copied from interface: IOServiceProvider
        Open existing file, and populate ncfile with it. This method is only called by the NetcdfFile constructor on itself. The provided NetcdfFile object will be empty except for the location String and the IOServiceProvider associated with this NetcdfFile object.
        Specified by:
        open in interface IOServiceProvider
        Overrides:
        open in class AbstractIOServiceProvider
        Parameters:
        raf - the file to work on, it has already passed the isValidFile() test.
        ncfile - add objects to this empty NetcdfFile
        cancelTask - used to monitor user cancellation; may be null.
        Throws:
        IOException - if read error

      • getFileTypeId

        public String getFileTypeId()
        Get a unique stnId for this file type.
        Returns:
        registered stnId of the file type
        See Also:
        "https://www.unidata.ucar.edu/software/netcdf-java/formats/FileTypes.html"

      • getFileTypeDescription

        public String getFileTypeDescription()
        Get a human-readable description for this file type.
        Returns:
        description of the file type
        See Also:
        "https://www.unidata.ucar.edu/software/netcdf-java/formats/FileTypes.html"

      • readData

        public Array readData​(Variable v2,
                      Section section)
               throws IOException
        Returns an ArraySequence, no subsetting is allowed.
        Parameters:
        v2 - a top-level Variable
        section - the section of data to read. There must be a Range for each Dimension in the variable, in order. Note: no nulls allowed. IOSP may not modify.
        Returns:
        ArraySequence
        Throws:
        IOException - if read error
        See Also:
        Range