High Rate data for SGS00

News
Oct 22, 2001
New version of high-rate data application released.

Introduction

 The full SGS00 dataset is archived in binary files, which contain the raw, uncalibrated sensor output.

The SGS00 archive files are available by FTP or from the NCAR MassStore.

A Java application, which calibrates this sensor output into ASCII or NetcDF form, is available for download below.

Using this application you can write variables and time periods of interest into text or NetCDF files for further processing using any analysis software you choose.

Therefore, in order to generate high rate data, you must do the following. Further information on these steps is contained in the table of contents, to the left.

  1. Install Java on your system. It must be at least version 1.2. You can install either the JRE (Java Runtime Environment) or the Java Developers Kit, which is variously known as the JDK, the SDK or the J2SE.
  2. Download and install the ISFF java application.
  3. Get your hands on the appropriate binary archive files, by FTP, CDROM, or direct transfer from the NCAR mass store.
  4. Run the ISFF java application.

Archive DataSet Organization and Size

The names of the binary files contain the start time (in GMT/UTC) of data in the file, formated as YYMMDD.HHMMSS, containing the two-digit year, month, day, hour, minute and second. For example, cos000915.160000 contains data for the sub-grid-scale array, starting at Sept 15, 2000, 16:00:00 GMT. The binary files typically contain 8 hours of data, with one file containg data from 00:00 to 07:59 GMT, the next file from 08:00 to 15:59 GMT, and a third file from 16:00 to 23:59 GMT.

The binary data files were all archived in the all directory. When copying or downloading the files to your system, put them in a directory called all. The java application expects to find the files in a directory of that name.

directory all
cosYYMMDD.HHMMSS
Data from the 16 sonic anemometers of the sub-grid-scale array. Each 8 hour file is about 150 Mbytes.
daiYYMMDD.HHMMSS
Data from the temperature, RH and wind profiles, barometer, and the sonic anemometers on the "a" and "b" towers. Each 8 hour file is about 55 Mbytes.

FTP Access

You may request via the web that binary archive files be placed on the ATD FTP server for you to download. Selecting Request Files (below) will provide a form for selecting one or more datasets and a time period. Files matching your request will be copied, if necessary, from the NCAR Mass Store System to the ATD FTP directory. When the files are available for FTP you are provided with links to the files and an email message listing the files.

Direct Mass Store Access

If you have direct access to the NCAR MassStore, the binary files are archived under /ATD/DATA/2000/SGS00/isff/raw_data/all. Use the msrcp command from a UNIX system to copy files from the mass store.

For example, to copy the sub-grid-scale array data for Sept 15 to your hard disk:

cd /some_data_directory
mkdir all
cd all
msrcp 'mss:/ATD/DATA/2000/SGS00/isff/raw_data/all/cos00915*' .
You must use quotes around the name of the mass store file mask, and note the trailing period (after a space). Also, the java application expects the files to be in a directory called "all". (In this case you would set RAWDATADIR to /some_data_directory, see below).

Array Configuration

 The sonic anemometers were configured in four different arrays during the course of the project. Also see entry 115 in the SGS logbook.
Array Dates Double Array
Height (agl)		 Double Array
Spacing		 Double Array
Variable Names
*=u,v,w,tc
N=[0-9]		 Single Array
Height (agl)		 Single Array
Spacing		 Single Array
Variable Names
*=u,v,w,tc
N=[0-5]
1 Sept 1-9 3.45 m 3.35 m *.dN.3m 6.90 m 6.70 m *.sN.6m
2 Sept 9-16 4.33 m 2.167 m *.dN.4m 8.66 m 4.33 m *.sN.8m
3 Sept 16-25 8.66 m 2.167 m *.dN.8m 4.33 m 1.05 m *.sN.4m
4 Sept 25 - Oct 2 4.15 m 0.50 m *.dN.4m 5.15 m 0.625 m *.sN.5m

Initial candidates for analysis

 Tom has identified the following periods as good initial candidates for analysis of each array. All four periods are weakly stable. PDT = Pacific Daylight Time = GMT - 7 hours
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© NCAR/Earth Observing Laboratory
This page was prepared by Gordon Maclean, NCAR Research Technology Facility