Real Time Integrated Atmospheric Water Vapor and TEC from GPS

AT A GLANCE IONOSPHERIC MAP ONE WEEK COMPARISON SLANT PLOTS CASE STUDIES RELATED INSTRUCTIONS UNIVERSITY LINKS REFERENCES LINKS AT A GLANCE IONOSPHERIC MAP ONE WEEK COMPARISON SLANT PLOTS CASE STUDIES RELATED INSTRUCTIONS UNIVERSITY LINKS REFERENCES LINKS

Suominet Related Instructions




Changing to a New IP#
All these changes should be done as root.

  • Change the IP address in the /etc/hosts file to the new address.
  • Edit the /etc/sysconfig/network-scripts/ifcfg-eth0 file to the new IP#.
  • If the host name will be changing (ie different subnet name) &/or the gateway IP# changes edit the /etc/sysconfig/network file. Check nameserver in resolv.conf , change to your local correct subnet specific nameserver if necessary. Edit the /etc/hosts.allow file and add the new subnet to the ssh line; also adding any different subnet that will be used to access your suominet CPU. DO NOT remove our subnets, as they need to be included for us to be able to access the cpu. (Please email Maggie Sleziak or Teresa Van Hove for our subnet ip#.)

How can I get GPS/MET data myself?

If you have installed a geodetic monument, and daily files with 10 hour latency will work for you; then you can simply ftp RINEX obs, nav, and met files from the UNAVCO archive area:

  • ftp to data-out.unavco.org (standard anonymous login with email for passwd)
  • cd to /pub/rinex/YYYY/DDD
  • get or SSSSDDDD0.YY.zip, (contains the RINEX nav,obs and met files) or, get the desired individual files:
                 SSSSDDD0.yyd.Z,
                 SSSSDDD0.YYo.Z,
                 SSSSDDD0.YYm.Z,
              

If you do not have a geodetic monument or you want to get your data every 30 minutes, install LDM on a cpu at your university. Please click here to get to LDM's installation page
You should request the raw files which are in BINEX format. Then use teqc to translate the BINEX data to any of the RINEX files you desire.

ie. To generate a 30 minute RINEX met and RINEX obs file :

  • teqc -binex +met SG26028A.03m +obs SG260280.03o SG26*1203-2-00???.bnx
ie. To generate only a RINEX met file:
  • teqc -binex +met SG26028a.03m SG26*1203-2-00???.bnx >/dev/null
For more information on teqc, go to http://www.unavco.ucar.edu/software/teqc/teqc.html

How do I get GPS PWV throuhg LDM?
To request the GPS PWV estimates and 30 minute average surface met values for each Suominet site, add the following line(s) to your ldmd.conf file which is located in the /usr/local/ldm/etc directory.

Under the "Request Entries section" enter:
 Request GPS (*_nc) xxx.xxx.xx.xxx
(Please email Maggie Sleziak or Teresa Van Hove for the ip #)

To request the raw GPS data from your Suominet station enter:
 Request GPSSRC (.*) your_suominet_ip#

pqact.conf:
The pqact.conf file is located in the /usr/local/ldm/etc directory. Please NOTE that tabs and returns must be used to create white spaces. Please do not use the space bar.

## This line puts the BINEX files from your system in GPS WEEK.DAY subdirs
GPSSRC	(.*)([0-9][0-9][0-9][0-9])-([0-9])-([0-9][0-9][0-9][0-9][0-9]).([bB][nN][xX])
         FILE    -overwrite      data/binex/\2.\3/\1\2-\3-\4.bnx

### to file the global PWV files (these have 2 day latency's at
#present) use:
GPS     (gsuPWV_20[0-9][0-9].[0-3][0-9][0-9].......[0-2]..._nc)
         FILE    -overwrite      data/ncpwv_test/\1

### to file the hourly computed 30 minute PWV files + ave surface mets
#in GPS WEEK.DAY directories  use:
GPS    (suoHWV_)(2[0-9][0-9][0-9]).([0-3][0-9][0-9]).([0-2][0-9])(.*_nc)
         FILE    -overwrite      data/hourly_pwv/\2.\3/\1\2.\3.\4\5

### the hourly PWV solutions are computed with predicted orbits and may
### have more errors -so it is recommended to get the daily solutions
### which are processed with IGS rapid orbit solutions for any long
### term purposes.
GPS     (suoPWV_20[0-9][0-9].[0-3][0-9][0-9].......[0-2]..._nc)
         FILE    -overwrite      data/ncpwv_test/\1
Please check http://www.unidata.ucar.edu/cgi-bin/man-cgi?pqact+1 for more information regarding the pqact.conf file.

How do we get our met data and read NETCDF format files?
The Suominet GPS PWV estimates along with 30 minute averaged surface met data are distributed via LDM. We need the IP# of the CPU which will be used to reqest data to configure our LDM CPU to allow your access, and we will give you the IP # for requesting data when you contact us.

You can download basic fortran netcdf reader that will translate the netcdf to an ascii table file.
The following is an example of a line in the pqact.conf for decoding NETCDF files to display plots with the UNIDATA GEMPAK utility, i.e.: Current Unidata LDM/IDD GEMPAK display.
The pqact.conf file is located in the /usr/local/ldm/etc directory.


	# Suominet data
	#
	#GPS    ^suoHWV
	GPS     ^TEST
        	PIPE    -close  decoders/dcsuomi
        	-d data/gempak/logs/dcsuomi.log
        	-e GEMTBL=/home/gempak/NAWIPS/gempak/tables
        	data/gempak/gps/YYYYMMDD_suomi.gem
	
Please remember that tabs should be used instead of spaces while editing the pqact.conf file. Please contact Unidata Support should you have any questions regarding the code above.


Using CDAAC Database to pull Suominet Data
Cosmic: Analysis Data: Data Tool

  • Click on the "Start Low-Level Interface" icon.
  • Select "Suominet" for the Database.
  • Select "suomiday_pwv" for the Top-level Table and for the Subtable.
  • Select "List" for Action.
  • Check first box for doy, hr, min, pre, temp, rh, pwv or any other desired field.
  • Check second box for doy and station (this will limit the data display to only one station and to limit the number of doy).
  • Press the submit button (under the HELP button).
  • Enter the name of the desired site in the constrains box. Note: The letters of the site have to be uppercase. Example: SA02
  • Press the submit button.
  • To generate an ascii file with the results, click on the "download" link at the bottom of the page.






Comments: webmaster@cosmic.ucar.edu
Last Modified: October, 2003
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