Search found 51 matches

by CDDIS_support_Lori
Fri Feb 14, 2020 10:15 am America/New_York
Forum: Questions/Comments
Question: GNSS data from CDDIS
Replies: 1

Re: GNSS data from CDDIS

The CDDIS provides an archive of GNSS data in support of the International GNSS Service (IGS, www.igs.org). We have data in daily files (30 second sampling) going back to 1991, hourly files (30 second sampling), and high-rate files (1 second sampling). The daily data are typically delivered to the C...
by CDDIS_support_Lori
Fri Feb 14, 2020 10:13 am America/New_York
Forum: Questions/Comments
Question: index.html file in CDDIS archive directories
Replies: 1

Re: index.html file in CDDIS archive directories

An index.html file is required in order for web browsers to be able to display the contents of a directory in a proper format. This file is used when accessing the CDDIS archive through https. There is no harm in downloading this file; however, if you prefer to not retrieve the index.html file, you ...
by CDDIS_support_Lori
Fri Feb 14, 2020 10:10 am America/New_York
Forum: Questions/Comments
Question: CDDIS acronyms
Replies: 1

Re: CDDIS acronyms

The CDDIS acronym list is available at URL https://cddis.nasa.gov/About/Acronyms.html.
by CDDIS_support_Lori
Fri Feb 14, 2020 10:07 am America/New_York
Forum: Questions/Comments
Question: satellite identifiers for SP3 orbit files
Replies: 1

Re: satellite identifiers for SP3 orbit files

The list of satellite identifiers for SP3 orbit files is available at URL http://cddis.gsfc.nasa.gov/Techniques/sp3c_satlist.html.
by CDDIS_support_Lori
Fri Feb 14, 2020 10:05 am America/New_York
Forum: Questions/Comments
Question: Timestamp on CDDIS data files
Replies: 1

Re: Timestamp on CDDIS data files

The timestamp of all files in the archive refers to local time at the CDDIS (EST or EDT).
by CDDIS_support_Lori
Thu Feb 13, 2020 4:01 pm America/New_York
Forum: Questions/Comments
Question: CDDIS data file names
Replies: 1

Re: CDDIS data file names

The .Z indicates the file was compressed using UNIX compression, e.g., the UNIX compress command. Users on UNIX systems can use the command uncompress to expand the file. Users on non-UNIX systems can consult the gzip web site. Note that ftp transfers of compressed files must be performed using bina...
by CDDIS_support_Lori
Thu Feb 13, 2020 3:51 pm America/New_York
Forum: Questions/Comments
Question: CDDIS data set formats
Replies: 1

Re: CDDIS data set formats

All documents describing the data formats available through the CDDIS can be found at URL https://cddis.gsfc.nasa.gov/archive/formats.
by CDDIS_support_Lori
Wed Feb 12, 2020 3:08 pm America/New_York
Forum: Questions/Comments
Question: Accessing CDDIS data archive
Replies: 1

Re: Accessing CDDIS data archive

There are several ways to access the CDDIS archive: anonymous ftp at URL ftp://cddis.gsfc.nasa.gov. NOTE this method will be discontinued in October 2020 via https at URL https://cddis.nasa.gov/archive/ via ftp-ssl using the command line and gdc.cddis.eosdis.nasa.gov Detalied information and example...
by CDDIS_support_Lori
Wed Feb 12, 2020 1:42 pm America/New_York
Forum: Questions/Comments
Question: IGEX file
Replies: 1

Re: IGEX file

The file https://cddis.nasa.gov/archive/glonass/data/daily/ yyyy / ddd / yy n/igex ddd 0. yy n.Z ( yyyy is the four-digit year, yy is the two-digit year, ddd is the three-digit day of year) is the daily broadcast ephemeris file for the GLONASS satellites. This file is a merge of the individual site ...
by CDDIS_support_Lori
Tue Feb 04, 2020 1:44 pm America/New_York
Forum: Questions/Comments
Question: GNSS
Replies: 1

Re: GNSS

The "Receiver Independent Exchange Format" RINEX format was first developed by the Astronomical Institute of the University of Berne for the easy exchange of the GPS data to be collected during GPS campaigns. The format consists of six ASCII file types, observation, navigation, meteorologi...