ISCCP C1 Native Data Set Readme File 1.0 Introduction This file contains information about the International Satellite Cloud Climatology Project (ISCCP) C1 native (NAT) data set. (ISCCP_C1_NAT) The data files are in native format. The home page for ISCCP is located at http://isccp.giss.nasa.gov/ This readme file also includes the following sections: Section 2.0 - provides general information about the data set. Section 3.0 - describes the format of the data. Section 4.0 - provides the user with science parameter information Section 5.0 - describes the sample read software. Section 6.0 - discusses how to invoke the run-time executable. Section 7.0 - provides an example of an actual run of the sample read software. If users have questions while using the ISCCP_C1_NAT sample read software, please contact the Langley Data Center Science, User and Data Services office at: EOSDIS Langley Data Center Science, Users and Data Services Office NASA Langley Research Center Mail Stop 157D 2 South Wright Street Hampton, VA 23681-2199 U.S.A. Email: larc@eos.nasa.gov Phone: (757) 864-8656 FAX: (757) 864-8807 URL: http://eosweb.larc.nasa.gov 2.0 Data Set Description Documentation on the ISCCP_C1_NAT data set can be obtained from the following URL: http://isccp.giss.nasa.gov/documents.html Contact for scientific inquiries: Dr. William B. Rossow NASA Goddard Institute for Space Studies 2880 Broadway New York, NY 10025 email: clwbr@giss.nasa.gov Phone: 212-678-5567 FAX: 212-678-5662 Contact for technical assistance: Chris Brest, PhD. NASA Goddard Institute for Space Studies 2880 Broadway, Rm 322A New York, NY 10025 email:cbrest@giss.nasa.gov Phone: 212 678-5565 FAX: 212 678-5552 3.0 Format and Packaging Each file of ISCCP_C1_NAT data is a zipped file containing a half months worth of ISCCP_C1_NAT data. To read the files, first unzip them with Info_Zip software. Information about downloading and using this freeware is available at the following URL: http://www.cdrom.com/pub/infozip/ The naming convention used for the files is isccp_c1_nat_YYYYMM_SD_ED.zip where SD is the start date and ED is the end date of data files included in the zip file. For example: isccp_c1_nat_199105_17_31.zip contains data files from 1991 May 17 and including May 31. The naming convention used for the data files is c1_YYMMDD_HH where HH is the hour of the data file and can be 00, 03, 06, 09, 12, 15, 18, or 21. For example: c1_901228_00 4.0 Science Parameters Information The ISCCP_C1_NAT data set contains 3-hourly, 250 KM equal-area grid data from various polar and geostationary satellites. More information on the ancillary and data files can be obtained from the International Satellite Cloud Climatology Project (ISCCP) Documentation of Cloud Data documentation available at URL http://isccp.giss.nasa.gov/documents.html 5.0 Description of Sample Read Software The FORTRAN program read_c1.f has been provided by the data producer as a sample program. The program has been altered by the Langley Data Center to allow the user to input the file to be read. It is up to the user to modify the program to output the data of interest. The code was developed using a f77, it has not been approved for use with f90 or f95 compilers. 6.0 Implementing Sample Read Software The program can be compiled with a simple f77 command line argument. A sample of the compilation output a user can expect to see follows: - For SunOS f77 -o rd_c1 read_c1.f - For SGI's f77 -o rd_c1 -bytereclen read_c1.f 7.0 A sample run > rd_c1 Enter beginning and ending latitude bands of interest 1 1 Enter date and GMT hour of interest in this format: YYMMDDHH, ex. 86103100 is 00GMT on Oct. 31, 1986 Filename: c1_901228_00 Do you want data on the equal-area grid? (T/F) Equal-angle grid latitude = -88.75 longitude = 1.25 fileid 94 nrec 1 cellbeg 1 cellend 99 year 1990 month 12 day 28 gmt 0 var index 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 var ( 1-25) 1 1 1 48 52 0 0 0 0 0 2 13 100 38 55 56 0 0 47 5 0 5 47 0 0 var (26-50) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 var (51-74) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 rvar index 1 2 3 4 5 6 7 8 9 10 rvar (75-84) -1000.000 -1000.000 -1000.000 -1000.000 -1000.000 -1000.000 -1000.000 -1000.000 -1000.000 -1000.000 * * * some output deleted * * rvar (125-132) 237.500 246.900 -1000.000 -1000.000 0.060 0.000 0.000 -1000.000 latitude = -88.75 longitude = 3.75 fileid 94 nrec 1 cellbeg 1 cellend 99 year 1990 month 12 day 28 gmt 0 var index 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 var ( 1-25) 1 1 1 48 52 0 0 0 0 0 2 13 100 38 55 56 0 0 47 5 0 5 47 0 0 * * * some output deleted * * Last updated: February 29, 2000