LASE_CAMEX3 Readme 1.0 Introduction This file contains information about the Lidar Atmospheric Sensing Experiment (LASE) CAMEX3 sample read software and data files. The LASE_CAMEX3 data set includes two types of files, one containing atmospheric scattering ratio profiles and the other containing water vapor concentration profiles. The LASE_CAMEX3 data files are stored in ASCII using the Global Tropospheric Experiment (GTE) Data Archive Format and can be read with the DAAC-provided read software. Additional information about the LASE data sets can be found in the LASE project and data set Guide documents at the Langley DAAC: http://eosweb.larc.nasa.gov Images of data from the LASE_CAMEX3 data files can be viewed at the following web site: LASE_CAMEX3: http://asd-www.larc.nasa.gov/lidar/cm3/camex3.html Information about the LASE project and instrumentation can be found at http://asd-www.larc.nasa.gov/lase/ASDlase.html The CAMEX 3 home page is http://ghrc.msfc.nasa.gov/camex3/ A document describing the GTE Data Archive Format is available from the DAAC at: http://eosweb.larc.nasa.gov/guide/gte/pwb-fmat.html This Readme file includes five other sections: Section 2.0 - describes the available read software. Section 3.0 - discusses how to create an executable program from read software source code. Section 4.0 - demonstrates how to invoke the executable program. Section 5.0 - provides general information for the data set. Section 6.0 - provides more detailed implementation notes. If there are questions about using the LASE sample read software, please contact the Langley Science, User and Data Services (SUDS) office. The SUDS office may be reached by E-Mail: support-asdc@earthdata.nasa.gov, by telephone at (757)864-8656, or by FAX at (757)864-8807. The SUDS mailing address is: Langley DAAC Science, User and Data Services Office NASA Langley Research Center Mail Stop 157D, 2 S. Wright St. Hampton, VA 23681-2199 USA 2.0 Read Software Files Currently, there is one sample read program which works with all GTE-formatted LASE data sets, read_lase_gte.c. It is written in ANSI C. This program has been tested on the following computers and operating systems: Computer Operating System ------------------- ---------------- Sun Sparc Solaris 2.5 Sun4 SunOS 4.1.3 SGI Origin 2000 IRIX 6.4 HP 9000/735 HP-UX 10.10 DEC Alpha Digital UNIX 4.0A This program is written as an example of how to read in the LASE_CAMEX3 data. As delivered, it reads in and writes to the screen the file header information followed by each profile's header and data. 3.0 Creating Executable Program Files 3.1 Create with C compiler To compile the program, use the command for the ANSI C compiler. The command varies slightly among operating systems. On Sun Solaris, SGI and DEC Alpha systems the command is: % cc -o read_lase_gte read_lase_gte.c On SunOS systems, use acc in place of cc in the preceding example. On HP-UX systems, the appropriate compiler command is c89 rather than cc. If the appropriate compile command is not found on your system, check to be sure that your PATH environment variable includes the directory that contains the compiler or specify the entire path to the compiler in your command. This compile command creates an executable program file named read_lase_gte. 4.0 Invoking Read Software 4.1 Running the executable version of the LASE Read C Program The executable version of the LASE read C program optionally accepts one command line argument, the name of the LASE data file, e.g. read_lase_gte lase_camex3_aer_07 If the file is not in the directory from which the program is invoked, it is necessary to specify the full directory path to the data file along with its name. The program allows for file names up to 50 characters long. If you have renamed the file to a longer name (including the path), you can extend the maximum allowed length by changing the value assigned to the parameter MAX_FILENAME in the #define statement near the beginning of the source code file. Note that the value specified should be the maximum length needed + 1. If the name of the LASE file is not specified at the command line when the program is executed, the user is prompted by the program to enter the file name. A sample of the interactive program execution is provided in Section 6.0. 5.0 Data Set Information 5.1 LASE_CAMEX3 Data Set LONG NAME FOR THIS DATA SET: Lidar Atmospheric Sensing Experiment data from the 3rd Convection and Moisture Experiment FILE NAMING CONVENTION: LASE_CAMEX3 data set files are prefixed with "lase_camex3_" to indicate they belong to this data set. This is followed by a three character designation of the type of profile stored in the file, 'aer' for atmospheric scattering ratio data and 'h2o' for water vapor concentration. The last two characters are digits indicating the flight number, preceded by an underscore. Here are two example file names: lase_camex3_aer_07 atmospheric scattering ratio profiles from flight 7 of the CAMEX3 experiment lase_camex3_h2o_15 water vapor concentration profiles from flight 15 of the LASE CAMEX3 experiment VARIABLES: There are nine variables for each profile. These variables are listed in the file header along with information about each variable, including the units, scale factor and offset, minimum and maximum values and the value used to indicate missing data. The last piece of information for each variable in the GTE format is the Limits of Detection code. That code is not used in the LASE data and its value is set to 0. Here's an example of the variable definition section of the file header: Data Profile, , 0.0100000, 0, -36061, 18343614, -99900.0, 0 Day of Year, Julian, 1.00000, 0, 233, 234, -999, 0 Elapsed Time , Sec (UT) , 1.00000, 0, 3, 86394, -999, 0 Geo. Alt. of Aircraft , m , 1.00000, 0, 9616, 11429, -999, 0 Geo. Alt. @ Begn , m , 1.00000, 0, 18000, 18000, -999, 0 Alt. increment , m , 1.00000, 0, -30, -30, -999, 0 Latitude , Deg N , 1.00000, 0, 23.00, 39.03, -999, 0 Longitude , Deg E , 1.00000, 0, -79.44, -63.00, -999, 0 Num Points in Profile, #, 1.00000, 0, 0, 600, -999, 0 Data Profile, g/kg, 1.00000, 0, -365.32, 7534.05, -999, 0 These data were reprocessed in December 1999 and are in a slightly different format than the other three LASE data sets. However, the same read software program will work with any of the LASE data sets. Latitude and longitude are stored as floating point values, as are the profile values. All scale factors are now 1.0 so multiplication by the scale factor is not necessary for LASE_CAMEX3 data values. Note that for all LASE variables the offset is 0. The first eight variables are written out on one line at the beginning of each profile, followed by the profile values, eight per line. The abbreviation 'Geo. Alt.' stands for geopotential altitude, and 'Geo. Alt. @ Begn' is the geopotential altitude at the beginning of the profile data array. FIRST RECORD OF DATA FROM FIRST DATA FILE: File header and first full profile from the lase_camex3_aer_07 file: 26 besrcd07.cm3 Browell, Dr. Edward V., NASA Langley Research Center LASE / DC-8 Aerosol Scattering Ratio CAMEX-3 98 08 21 99 12 17 07 9 5 3 0 3 Day of Year, Julian, 1.00000, 0, 233, 234, -999, 0 Elapsed Time , Sec (UT) , 1.00000, 0, 3, 86394, -999, 0 Geo. Alt. of Aircraft , m , 1.00000, 0, 9616, 11429, -999, 0 Geo. Alt. @ Begn , m , 1.00000, 0, 18000, 18000, -999, 0 Alt. increment , m , 1.00000, 0, -30, -30, -999, 0 Latitude , Deg N , 1.00000, 0, 23.00, 39.03, -999, 0 Longitude , Deg E , 1.00000, 0, -79.44, -63.00, -999, 0 Num Points in Profile, #, 1.00000, 0, 0, 600, -999, 0 Data Profile, g/kg, 1.00000, 0, -365.32, 7534.05, -999, 0 -------------------------------------------------------------------- Vertical data interval is 30 m., horizontal interval is 1 minute. Vertical resolution is 60 m. and horizontal resolution is 6 sec. http://asd-www.larc.nasa.gov/lidar/lidar.html -------------------------------------------------------------------- 233, 65148, 9616, 18000, -30, 27.99, -77.62, 600 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, 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-999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00, -999.00 CONTACTS FOR DATA PRODUCT INFORMATION: Vince Brackett NASA Langley Research Center MS 401A, 21 Langley Boulevard Hampton, VA 23681-1379 USA E-mail: v.g.brackett@larc.nasa.gov Phone: 757-864-5854 Fax: 757-864-7790 Marian B. Clayton NASA Langley Research Center MS 401A, 21 Langley Boulevard Hampton, VA 23681-1379 USA E-mail: m.b.clayton@larc.nasa.gov Phone: 757-864-2841 Fax: 757-864-7790 6.0 Implementation Notes This section gives a brief explanation of how to run the sample read software. 6.1 read_lase_gte C Program The read_lase_gte C program can be used to read any of the LASE data set files. The following is a sample session showing compilation and execution of the read_lase_gte program on the machine named darrin. darrin 3% cc -o read_lase_gte read_lase_gte.c darrin 4% read_lase_gte ********************************************************** LASE READ PROGRAM Version 2.0 17 FEB 2000 This program reads the LASE data in the GTE Data Archive Format. The input file name is built according to the naming convention formed by the Langley DAAC. Currently the input file name is expected to be no more than 50 characters in length. If you have changed the name of the input file to greater than 50 characters, you will need to modify this program, changing the value of the MAX_FILENAME parameter in the #define statement near the beginning of the file to be at least the maximum length needed + 1. All data files are assumed to be in the current working directory. If the files are located in another directory, please be sure to include the complete path with the file name. Platforms tested: SUN (Solaris 2.5 and SunOS 4.1.3) HP (HP-UX 10.10) SGI (IRIX 6.4) Dec Alpha (Digital UNIX V4.0A) Contact: Langley DAAC User and Data Services Office NASA Langley Research Center Mail Stop 157D Hampton, VA 23681-2199 Phone (757)864-8656 Fax (757)864-8807 e-mail: support-asdc@earthdata.nasa.gov http://eosweb.larc.nasa.gov ********************************************************** Press Return or Enter to continue Please enter the LASE data file name lase_camex3_aer_07 Investigator: Browell, Dr. Edward V., NASA Langley Research Center Data: LASE / DC-8 Aerosol Scattering Ratio Mission: CAMEX-3 Start date: 8/21/98 Date processed: 12/17/99 Flight Number: 7 Num Variable Units Scale Offset Min Max Missing -------------------------------------------------------------------------------- 1) Day of Year Julian 1.00 0.00 233.00 234.00 -999.00 2) Elapsed Time Sec (UT) 1.00 0.00 3.00 86394.00 -999.00 3) Geo. Alt. of Aircraft m 1.00 0.00 9616.00 11429.00 -999.00 4) Geo. Alt. @ Begn m 1.00 0.00 18000.00 18000.00 -999.00 5) Alt. increment m 1.00 0.00 -30.00 -30.00 -999.00 6) Latitude Deg N 1.00 0.00 23.00 39.03 -999.00 7) Longitude Deg E 1.00 0.00 -79.44 -63.00 -999.00 8) Num Points in Profile # 1.00 0.00 0.00 600.00 -999.00 9) Data Profile g/kg 1.00 0.00 -365.32 7534.05 -999.00 -------------------------------------------------------------------- Vertical data interval is 30 m., horizontal interval is 1 minute. Vertical resolution is 60 m. and horizontal resolution is 6 sec. http://asd-www.larc.nasa.gov/lidar/lidar.html -------------------------------------------------------------------- This program as delivered will write all the profiles to the screen until the end-of-file is reached. To interrupt the program use CTRL C (press the C key while holding down the Ctrl or Control key). Press Return or Enter to continue Profile 1: Day: 233 Time: 65148 Lat: 27.990000 Lon: -77.620003 Altitude info--Aircraft: 9616 @Begn: 18000 Increment: -30 Total Scattering Ratio Profile (600 points): -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 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Lat: 27.990000 Lon: -77.599998 Altitude info--Aircraft: 9648 @Begn: 18000 Increment: -30 Total Scattering Ratio Profile (600 points): -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 -999.00 . . . Output of profiles continues until the end-of-file is reached or a CTRL-C is entered (hold down the Control or CTRL key and press the C key). ---------------------------------- Last Modified 12/04/2000