DORIS data holdings

DORIS data are provided in two possible forms, depending upon the type of DORIS receiver on-board the satellite. Missions prior to Jason-2 (e.g., SPOT, TOPEX/Poseidon, Jason-1, and Envisat) supply data in multi-day (typically 10 days) files corresponding to the mission’s data processing arc. Missions launched after, and including, Jason-2 in 2008 (e.g., Jason-2, CryoSat-2, HY-2A, SARAL, and future satellites) utilize a new multi-channel DORIS receiver, which is capable of tracking up to seven beacons simultaneously. These missions provide data in daily files in addition to these multi-day files.

The multi-day files are in a DORIS-specific format; these files contain multiple days of data corresponding to the specific satellite’s processing cycle. The new multi-channel DORIS receiver provides both Doppler and phase observations; data from this model are archived in both multi-day DORIS-formatted files and daily files in DORIS Receiver Independent Exchange (RINEX) format respectively.

The data from each satellite are stored in separate files and directories, by satellite. DORIS data are organized in subdirectories by

  • File content (multi-day files, daily files)
  • Satellite
  • Year

Spatial coverage

Temporal coverage

Data Volume

  • DORIS data in multi-day files: ~3-7 Mbytes/satellite/cycle (compressed)
  • DORIS data in daily files: ~2 Mbytes/satellite/day (compressed)

Data Formats

DORIS data are available from the CDDIS in subdirectories by satellite and year (for RINEX data).

The starting directory for these files is:

ftp://cddis.gsfc.nasa.gov/doris/data/

Append the following directory and file names to the starting directory:

SAT/SATdata###.VVV.Z  (multi-day files)

SAT/YYYY/SATrxYYDDD.VVV.Z   (RINEX files)

as described in the table below.

Close window

SatelliteCodeStart date
(YYYY-MM-DD)
End date
(YYYY-MM-DD)
CryoSat-2cs22010-05-30---
Envisaten12002-04-102012-04-08
HY-2Ah2a2011-10-01---
Jason-1ja12002-01-152013-06-21
Jason-2ja22008-07-12---
Saralsrl2013-03-14---
SPOT-2sp21990-03-312009-07-14
SPOT-3sp31994-02-011996-11-13
SPOT-4sp41998-05-012013-06-24
SPOT-5sp52002-06-11---
TOPEX/Poseidontop1992-09-252004-11-01

More about DORIS-equipped satellites

Code Meaning
SAT 3-character satellite code
YYYY4-digit year
DDD 3-digit day of year
### 3-digit processing cycle number
VVV 3-digit data version number
.Z Unix compressed file