Welcome to the LSU Center for GeoInformatics (C4G)
Home of the Louisiana Spatial Reference Center (LSRC) and the 
GULFNet Continuously Operating Reference Station (CORS) Network

                  http://LSRC.lsu.edu

Access to all GULFNet CORS data in the repository are made available freely
to the public through the LSU C4G in its role of LSRC and partnerships with 
members of the Gulf Coast Spatial Reference Consortium (GCSRC).
=================
Data can be retrieved using command line or FTP client via anonymous ftp 
from CORS.lsu.edu on port: 8021 or with HTTP by pointing your browser to 
http://cors.lsu.edu/ (due to increases in security efforts not all 
browsers support direct access using the FTP protocol) so we have accommodated 
browser access through HTTP instead of FTP.		  
GULFNet CORS stations are owned and operated by C4G or our partners in the 
GCSRC - Gulf Coast Spatial Reference Consortium.
GULFNet CORS data are distributed to the public free of charge.

All LSRC CORS GNSS data files collected from GULFNet CORS stations are made 
available to NGS & the public in Trimble’s proprietary data-file formats 
(R00/T00/T01/T02) or (.DAT or .TGD). All GULFNet CORS files found in this 
data archive are logged in formats by native to Trimble GPS/GNSS receivers 
from "Record Type 27" (RT27) files. The data include observation, 
meteorological, navigation/ephemeris for the stations. Most data are 
available within 1 hour from when they were recorded at remote CORS sites.

Starting on 10/10/2023 at the request of NGS we started logging 24 hour 
30 second RINEX 3.xx files in addition to the hourly 15 second T02 files 
described above. At the end of each GPS day the receiver native files are 
converted to RINEX 3.0x zipped Hatanaka format and pushed to the C4G/LSRC 
FTP server where NGS picks them up. 

All files land at cors.lsu.edu in the following directory path:  
	/RefData.YY/Month.MMM/Day.DD/ 

All files prior to 10/10/2023 can be found in the following path at cors.lsu.edu: 
	/t02/YYYY/DOY/SITE/

All files generated from Leica receivers are found in the cors.lsu.edu path: 
	/t02/Leica/YYYY/DOY/SITE/

Louisiana NGS CORS 
========================
NGS redistributes some of the GULFNet CORS data to the public free of 
charge through its partnership with the LSRC at LSU's Center for 
GeoInformatics. NGS publishes its subset of the GULFNet CORS data through
their CORS website found at the following links.			  

	https://geodesy.noaa.gov/corsdata/

NOAA's National Geodetic Survey (NGS) operates the Continuously Operating
Reference Station (CORS) network that consists of group of Global 
Navigation Satellite System (GNSS) reference stations which provide code 
range and carrier phase data to users in support of postprocessing 
applications. The stations are owned and operated by federal, state, local 
agencies, private companies, and university groups, and NGS redistributes 
their data to the public free of charge.

The GNSS data collected at these stations are made available to the public 
by NGS in Receiver INdependent EXchange (RINEX) format. The data include 
observation, meteorological, navigation/ephemeris, station logs and NGS 
coordinate files for the stations. Most data are available within 1 hour 
from when they were recorded at the remote site, and a few sites have a 
delay of 24 hours.

ACCESS TO DATA
=================
 Data can be retrieved via HTTPS with your browser from geodesy.noaa.gov

       https://geodesy.noaa.gov/corsdata/

Alternatively, a customized data request service is available at:
       http://geodesy.noaa.gov/UFCORS

FILE RETENTION POLICY
======================

RINEX observation, meteorological, navigation and TEQC summary files:
Hourly files are only kept for 2 days. Daily files are kept permanently, 
However the 24hr (daily) RINEX observation files that are 
gzipped ({ssss}{ddd}0.{yy}o.gz) are decimated to a 30 second sampling rate 
equivalent to the {ssss}{ddd}0.{yy}d.Z site specific GPS navigation files 
are only kept for sites that NGS submits to the IGS network Meteorological 
files are available only for sites with independent meteorological sensors.

After six-months to one year the second copy of the RINEX observation 
files that are gzipped is removed i.e. file name {ssss}{ddd}0.{yy}o.gz.

All orbit files are kept permanently
Coord files are updated as needed
Logs files are updated as needed
Plot files are updated daily 


NGS CONTACT INFORMATION
==================================

If you have questions about this file or about CORS in general please check
  http://www.ngs.noaa.gov/CORS/
  http://alt.ngs.noaa.gov/CORS
or email ngs.cors@noaa.gov