ISCCP CATALOG OF DATA AND PRODUCTS Section 7.2

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7.2 DATA HANDLING SOFTWARE

This section will describe supporting information available, generally source code listings describing software that has been implemented at the ICA or other ISCCP Data Centers, for reading ISCCP data tapes and listing the contents, producing extracts, etc. The software is offered to users to aid in the implementation of similar software on their own computer systems.

FORTRAN 77 source modules designated for reading, decoding, and/or copying B3 images from tape onto other media are included in the Volume Identification (written in both ASCII and EBCDIC) file on all B3-data tapes. Available on the ISCCP Home Page (http://isccp.giss.nasa.gov/).

The GOES calibration routines include software for converting IR count values to temperature then, by use of the Planck function, to radiance data. Software for the conversion of the visible count values to radiance values is also included.

The latitude/longitude of a given point (pixel) in a full resolution 2500 x 2500 METEOSAT rectified image can be obtained by supplying the navigation routine with the column/line coordinates of the point. The column and line numbers for B1 data sets must be converted to correspond to the full resolution data before they can be used as input to this routine. Formulae are provided for these conversions. The reverse operation, latitude/longitude to column/line, can also be performed with this routine.

The GMS navigation routine is used by the GPC to navigate the GMS B3 image data. The navigation of each pixel uses line and element numbers from the original IR image at full resolution.

Each C1 data tape contains a program (C1READ) which can be used to read and decode the C1 data files. The program also serves as a guide to the C1 data structure. It reads one data record at a time to retrieve data for a specified latitude/longitude range, and automatically remaps all the data into a 2.5 degree equal-angle map grid. Available on the ISCCP Home Page (http://isccp.giss.nasa.gov/).

Each C2 data tape contains a program (C2READ) which can be used to read and decode the C2 data files. The file is coded entirely as ASCII characters, meant to be printed as text. C2READ retrieves the data from one record at a time. A SAMPLE MAIN program is also provided to illustrate the use of the C2READ program. SAMPLE MAIN prints all the quantities from one particular longitude for all latitudes. Documentation contained in the software listing explains the functions of each component of the program. Available on the ISCCP Home Page (http://isccp.giss.nasa.gov/).

Each D1 data tape contains a program (D1READ) which can be used to read and decode the D1 data files. The program also serves as a guide to the D1 data structure. It reads one data record at a time to retrieve data for a specified latitude/longitude range, and automatically remaps all the data into a 2.5 degree equal-angle map grid. Available on the ISCCP Home Page (http://isccp.giss.nasa.gov/).

Each D2 data tape contains a program (D2READ) which can be used to read and decode the D2 data files. The file is coded entirely as ASCII characters, meant to be printed as text. D2READ retrieves the data from one record at a time. A SAMPLE MAIN program is also provided to illustrate the use of the D2READ program. SAMPLE MAIN prints all the quantities from one particular longitude for all latitudes. Documentation contained in the software listing explains the functions of each component of the program. Available on the ISCCP Home Page (http://isccp.giss.nasa.gov/).

Each DX data tape contains a program (DXREAD) which can be used to read and decode the DX data files. Available on the ISCCP Home Page (http://isccp.giss.nasa.gov/).