Product Download & Preprocessing Facilities for DORIS

Installation

Affter cloning, you can use pip to install the package, e.g. pip install . or pip install -e . for an editable version. Pick the latter if you need to edit the source code.

Products, Data and Executables

Product Type	Program	Notes
attitude files	prepattitude	Download and pre-process satellite-specific (measured) attitude files
RINEX (data)	rnxdwn	Download DORIS RINEX files
orbits	sp3dwn	Download (final) satellite-specific sp3c file(s)
VMF	vmfdwn	Download VMF product files. For now, we only handle gridded V3GR VMF3-specific files
satellite mass	satmass	Download satellite-specific mass history files
all	prepyda	Download all products/data abovev, based on a a yaml file

Information on the data/products can be found in products. The Program column above lists the programs available system-wide once you install the project.

Usage

For usage type any program name followed by -h or --help.

Credentials

Note for CDDIS Web Archive

For some satellites quaternion files are archived and downloaded from CDDIS (e.g. JASON[123] missions). To download these you will need a .netrc file.

Note for Copernicus Web Archive

For some satellites quaternion files are archived and downloaded from Copernicus (e.g. Sentinel missions). To download these you will need a .s3cfg file, placed at the user's home directory.

Data & Products not Listed Here

Space-Weather Data

Space-weather data can be downloaded from CelesTrak in csv format (do not try downloading the older legacy format, use the current standard).

Earth Orientation Parameters

These data files can be downloaded from IERS, using either the C04/14 or the C04/20 series. A quick link to the latest file is https://hpiers.obspm.fr/iers/eop/eopc04_20_v3/eopc04.1962-now

Attitude Download & Pre-Processing

The output file is a space delimited tabular file. The columns depend on the satellite "family". Note that the output file contains date/time information in the TT timescale (regardless of satellite or input file(s)).

• MJDay is Modified Julian day (integer) in TT,
• SoD are the seconds of day, i.e. seconds passed since the start of MJDay (fractional) in TT,
• Q0 is the real part of the quaternion,
• Q1, Q2, Q3 are the imaginary parts,
• LP and RP are the rotation angles of the left and right panel, respectively (Jason satellites.)

Available Satellites:

Satellite Id	Name	Launch Yr	Archive
ja3	Jason-3	2016	CDDIS
s3a	Sentinel-3A	2016	Copernicus
s3b	Sentinel-3B	2018	Copernicus
s6a	Sentinel-6A	2020	Copernicus

Jason satellites

MJDay SoD Q0 Q1 Q2 Q3 LP RP

Sentinel satellites

MJDay SoD Q0 Q1 Q2 Q3

License

Licensed under the MIT License. See LICENSE.